I recently acquired a nice HP-105B, serial prefix 1240A, and like Perry Sandeen (posted here 10 May 2016) was pleasantly surprised to find a 10811-type oscillator inside in place of the old blue oven. Well, the oscillator isn't actually labelled "10811" but has a label "Serial No. 3010A62646 / Hewlett Packard / Made in U.S.A. / R11 147K." So, this is essentially the same oscillator as Perry found in his 105B. The oscillator works well although the meter reading for the 5 MHz output is low, about 30 instead of the expected 80 (per the 105B manual for the 1240A series). The measured output is also low, about 1 Volt where 1.5 Volt is the expected minimum. Might this be due to the change from the old 105 crystal oven to the 10811? What is the received wisdom on replacement of the previously-removed factory Ni-Cad pack? There are many small 12 Volt batteries available, two of which would easily fit into the space available and some of which might not even catch fire! Other options are an external battery+charger or even a UPS on the AC line. Opinions? Jeremy / N6WFO

Hi Jeremy: It's a very bad idea to put any battery with acid in an enclosure that has electronics since if it vents the acid will etch the PCBs. Guess how I learned this. I got a great price on a Gibbs Frequency Standard because the oven no longer worked. http://prc68.com/I/office_equip.html Modern Ni-Cad batteries have much more capacity than older ones and no longer have a memory effect. They are also very easy to charge, so why not just replace the old cells? -- Have Fun, Brooke Clarke, N6GCE http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html The lesser of evils is still evil. -------- Original Message -------- > I recently acquired a nice HP-105B, serial prefix 1240A, and like Perry Sandeen (posted here 10 May 2016) was > pleasantly surprised to find a 10811-type oscillator inside in place of the old blue oven. Well, the oscillator isn't > actually labelled "10811" but has a label "Serial No. 3010A62646 / Hewlett Packard / Made in U.S.A. / R11 147K." So, > this is essentially the same oscillator as Perry found in his 105B. > > The oscillator works well although the meter reading for the 5 MHz output is low, about 30 instead of the expected 80 > (per the 105B manual for the 1240A series). The measured output is also low, about 1 Volt where 1.5 Volt is the > expected minimum. Might this be due to the change from the old 105 crystal oven to the 10811? > > What is the received wisdom on replacement of the previously-removed factory Ni-Cad pack? There are many small 12 Volt > batteries available, two of which would easily fit into the space available and some of which might not even catch > fire! Other options are an external battery+charger or even a UPS on the AC line. Opinions? > > Jeremy / N6WFO > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

Hi Brooke, sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as electrolyte and they are normally very air-tide, and widely used in radios. 73 KJ6UHN Alex On 9/14/2016 4:45 PM, Brooke Clarke wrote: > Hi Jeremy: > > It's a very bad idea to put any battery with acid in an enclosure that > has electronics since if it vents the acid will etch the PCBs. > Guess how I learned this. I got a great price on a Gibbs Frequency > Standard because the oven no longer worked. > http://prc68.com/I/office_equip.html > > > Modern Ni-Cad batteries have much more capacity than older ones and no > longer have a memory effect. They are also very easy to charge, so > why not just replace the old cells? >

Hi Alex: Yes, I'm recommending Ni-Cad but NOT any acid type. -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html The lesser of evils is still evil. -------- Original Message -------- > Hi Brooke, > > sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they have K-OH kalium hidrioxid [potassium > hydroxide for anglophone ] as electrolyte and they are normally very air-tide, and widely used in radios. > > 73 > > KJ6UHN > > Alex > > On 9/14/2016 4:45 PM, Brooke Clarke wrote: >> Hi Jeremy: >> >> It's a very bad idea to put any battery with acid in an enclosure that has electronics since if it vents the acid >> will etch the PCBs. >> Guess how I learned this. I got a great price on a Gibbs Frequency Standard because the oven no longer worked. >> http://prc68.com/I/office_equip.html >> >> >> Modern Ni-Cad batteries have much more capacity than older ones and no longer have a memory effect. They are also >> very easy to charge, so why not just replace the old cells? >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. >

Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel cells) but rather lithium rechargeable, providing I can find a type that won't catch fire and will work with the 105B'scircuits. Jeremy On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> wrote: > Hi Alex: > > Yes, I'm recommending Ni-Cad but NOT any acid type. > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > The lesser of evils is still evil. > > -------- Original Message -------- > >> Hi Brooke, >> >> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they >> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >> electrolyte and they are normally very air-tide, and widely used in radios. >> >> 73 >> >> KJ6UHN >> >> Alex >> >> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >> >>> Hi Jeremy: >>> >>> It's a very bad idea to put any battery with acid in an enclosure that >>> has electronics since if it vents the acid will etch the PCBs. >>> Guess how I learned this. I got a great price on a Gibbs Frequency >>> Standard because the oven no longer worked. >>> http://prc68.com/I/office_equip.html >>> >>> >>> Modern Ni-Cad batteries have much more capacity than older ones and no >>> longer have a memory effect. They are also very easy to charge, so why not >>> just replace the old cells? >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > -- Sent from Gmail Mobile

NiMH batteries are close the same voltage and charge the same as NiCd and are more available and not toxic when disposing of them. They should be a good replacement. Lithiums are very different in voltage and charging. David N1HAC On 9/14/16 10:19 PM, Jeremy Nichols wrote: > Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel > cells) but rather lithium rechargeable, providing I can find a type that > won't catch fire and will work with the 105B'scircuits. > > Jeremy > > > On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> wrote: > >> Hi Alex: >> >> Yes, I'm recommending Ni-Cad but NOT any acid type. >> >> -- >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.end2partygovernment.com/2012Issues.html >> The lesser of evils is still evil. >> >> -------- Original Message -------- >> >>> Hi Brooke, >>> >>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they >>> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >>> electrolyte and they are normally very air-tide, and widely used in radios. >>> >>> 73 >>> >>> KJ6UHN >>> >>> Alex >>> >>> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >>> >>>> Hi Jeremy: >>>> >>>> It's a very bad idea to put any battery with acid in an enclosure that >>>> has electronics since if it vents the acid will etch the PCBs. >>>> Guess how I learned this. I got a great price on a Gibbs Frequency >>>> Standard because the oven no longer worked. >>>> http://prc68.com/I/office_equip.html >>>> >>>> >>>> Modern Ni-Cad batteries have much more capacity than older ones and no >>>> longer have a memory effect. They are also very easy to charge, so why not >>>> just replace the old cells? >>>> >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>> ailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >

Hi Jeremy: I'm currently having fun playing with various rechargeable battery related stuff which includes Li-Ion cells. http://www.prc68.com/I/BatTst.shtml#Resistor The cells come in three configurations: 1. the raw flat top cell with optional tabs to allow easy soldering into a pack, 2. cell plus positive button cap which includes a Positive Temperature Coefficient (PTC) fuse and an over pressure vent, 3. fully protected, like 2, plus circuit that turns off the battery if charging and over voltage or loaded and under voltage. On these you can feel a wire/ribbon running from positive to negative under the shrink wrap and they are slightly longer. These configurations are independent of the flavor of Li chemistry. To go with any of the above you need a charger specific to the particular Li chemistry (the charging voltage is not the same) and if a pack you also need a either cells like 3 above or a protection circuit for the pack. For optimum performance in addition a tap between each virtual cell (made of of parallel cells) so that the charge can be balanced and a charger that can do that. This is not easy, witness the current recall of the Galaxy Note 7s phones. I would just use modern Ni-Cad cells mainly because of the ease of charging and maintaining them and use the existing charging circuitry. Li chemistry has advantages for portable equipment, but not so much for rack mounted equipment. -- Have Fun, Brooke Clarke http://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html The lesser of evils is still evil. -------- Original Message -------- > Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel > cells) but rather lithium rechargeable, providing I can find a type that > won't catch fire and will work with the 105B'scircuits. > > Jeremy > > > On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> wrote: > >> Hi Alex: >> >> Yes, I'm recommending Ni-Cad but NOT any acid type. >> >> -- >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.end2partygovernment.com/2012Issues.html >> The lesser of evils is still evil. >> >> -------- Original Message -------- >> >>> Hi Brooke, >>> >>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they >>> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >>> electrolyte and they are normally very air-tide, and widely used in radios. >>> >>> 73 >>> >>> KJ6UHN >>> >>> Alex >>> >>> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >>> >>>> Hi Jeremy: >>>> >>>> It's a very bad idea to put any battery with acid in an enclosure that >>>> has electronics since if it vents the acid will etch the PCBs. >>>> Guess how I learned this. I got a great price on a Gibbs Frequency >>>> Standard because the oven no longer worked. >>>> http://prc68.com/I/office_equip.html >>>> >>>> >>>> Modern Ni-Cad batteries have much more capacity than older ones and no >>>> longer have a memory effect. They are also very easy to charge, so why not >>>> just replace the old cells? >>>> >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>> ailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. >> >

Hi A bigger question becomes: Do batteries inside equipment make much sense anymore? These days, a UPS is often a standard part of a rack in an outage prone area. Powering the “whatever” instrument off of the same UPS as the rest of the stuff is one obvious answer. The other answer is an even older approach. Use a battery bank that is external to all the gear in the rack and tend it independently of each box in the rack. That way you have a few very large cells to worry about rather than a whole bunch scattered about. Things like lead acid that are impractical in a piece of gear are more of an option in an independent battery box. A single charger / line supply makes it easier to invest in something with real smarts in it. The advent of dirt cheap isolated switchers makes the conversion to instrument voltages a lot easier than it once was. Pick a common voltage like 12, 24, or 48V and run with it. My answer to the frequency standard battery pack question has become “don’t do it”. It makes them a *lot* lighter weight !!! Bob > On Sep 15, 2016, at 12:59 PM, Brooke Clarke <brooke@pacific.net> wrote: > > Hi Jeremy: > > I'm currently having fun playing with various rechargeable battery related stuff which includes Li-Ion cells. > http://www.prc68.com/I/BatTst.shtml#Resistor > The cells come in three configurations: > 1. the raw flat top cell with optional tabs to allow easy soldering into a pack, > 2. cell plus positive button cap which includes a Positive Temperature Coefficient (PTC) fuse and an over pressure vent, > 3. fully protected, like 2, plus circuit that turns off the battery if charging and over voltage or loaded and under voltage. On these you can feel a wire/ribbon running from positive to negative under the shrink wrap and they are slightly longer. > These configurations are independent of the flavor of Li chemistry. > > To go with any of the above you need a charger specific to the particular Li chemistry (the charging voltage is not the same) and if a pack you also need a either cells like 3 above or a protection circuit for the pack. For optimum performance in addition a tap between each virtual cell (made of of parallel cells) so that the charge can be balanced and a charger that can do that. This is not easy, witness the current recall of the Galaxy Note 7s phones. > > I would just use modern Ni-Cad cells mainly because of the ease of charging and maintaining them and use the existing charging circuitry. > Li chemistry has advantages for portable equipment, but not so much for rack mounted equipment. > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > The lesser of evils is still evil. > > -------- Original Message -------- >> Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid (gel >> cells) but rather lithium rechargeable, providing I can find a type that >> won't catch fire and will work with the 105B'scircuits. >> >> Jeremy >> >> >> On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> wrote: >> >>> Hi Alex: >>> >>> Yes, I'm recommending Ni-Cad but NOT any acid type. >>> >>> -- >>> Have Fun, >>> >>> Brooke Clarke >>> http://www.PRC68.com >>> http://www.end2partygovernment.com/2012Issues.html >>> The lesser of evils is still evil. >>> >>> -------- Original Message -------- >>> >>>> Hi Brooke, >>>> >>>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, they >>>> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >>>> electrolyte and they are normally very air-tide, and widely used in radios. >>>> >>>> 73 >>>> >>>> KJ6UHN >>>> >>>> Alex >>>> >>>> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >>>> >>>>> Hi Jeremy: >>>>> >>>>> It's a very bad idea to put any battery with acid in an enclosure that >>>>> has electronics since if it vents the acid will etch the PCBs. >>>>> Guess how I learned this. I got a great price on a Gibbs Frequency >>>>> Standard because the oven no longer worked. >>>>> http://prc68.com/I/office_equip.html >>>>> >>>>> >>>>> Modern Ni-Cad batteries have much more capacity than older ones and no >>>>> longer have a memory effect. They are also very easy to charge, so why not >>>>> just replace the old cells? >>>>> >>>>> >>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>>> ailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>> ailman/listinfo/time-nuts >>> and follow the instructions there. >>> >> > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.

Brookes comments are the facts you can not use simple charging circuits. But smart charging circuits seem to be available on various sites for low cost. It seems the RC modelers have helped us out. The thing I will say is I have ordered new nicad C cell batteries from major a major vendor and they did not last long at all for the cost I was quite disappointed. Regards Paul WB8TSL On Thu, Sep 15, 2016 at 12:59 PM, Brooke Clarke <brooke@pacific.net> wrote: > Hi Jeremy: > > I'm currently having fun playing with various rechargeable battery related > stuff which includes Li-Ion cells. > http://www.prc68.com/I/BatTst.shtml#Resistor > The cells come in three configurations: > 1. the raw flat top cell with optional tabs to allow easy soldering into a > pack, > 2. cell plus positive button cap which includes a Positive Temperature > Coefficient (PTC) fuse and an over pressure vent, > 3. fully protected, like 2, plus circuit that turns off the battery if > charging and over voltage or loaded and under voltage. On these you can > feel a wire/ribbon running from positive to negative under the shrink wrap > and they are slightly longer. > These configurations are independent of the flavor of Li chemistry. > > To go with any of the above you need a charger specific to the particular > Li chemistry (the charging voltage is not the same) and if a pack you also > need a either cells like 3 above or a protection circuit for the pack. For > optimum performance in addition a tap between each virtual cell (made of of > parallel cells) so that the charge can be balanced and a charger that can > do that. This is not easy, witness the current recall of the Galaxy Note > 7s phones. > > I would just use modern Ni-Cad cells mainly because of the ease of > charging and maintaining them and use the existing charging circuitry. > Li chemistry has advantages for portable equipment, but not so much for > rack mounted equipment. > > -- > Have Fun, > > Brooke Clarke > http://www.PRC68.com > http://www.end2partygovernment.com/2012Issues.html > The lesser of evils is still evil. > > -------- Original Message -------- > >> Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid >> (gel >> cells) but rather lithium rechargeable, providing I can find a type that >> won't catch fire and will work with the 105B'scircuits. >> >> Jeremy >> >> >> On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> >> wrote: >> >> Hi Alex: >>> >>> Yes, I'm recommending Ni-Cad but NOT any acid type. >>> >>> -- >>> Have Fun, >>> >>> Brooke Clarke >>> http://www.PRC68.com >>> http://www.end2partygovernment.com/2012Issues.html >>> The lesser of evils is still evil. >>> >>> -------- Original Message -------- >>> >>> Hi Brooke, >>>> >>>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, >>>> they >>>> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >>>> electrolyte and they are normally very air-tide, and widely used in >>>> radios. >>>> >>>> 73 >>>> >>>> KJ6UHN >>>> >>>> Alex >>>> >>>> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >>>> >>>> Hi Jeremy: >>>>> >>>>> It's a very bad idea to put any battery with acid in an enclosure that >>>>> has electronics since if it vents the acid will etch the PCBs. >>>>> Guess how I learned this. I got a great price on a Gibbs Frequency >>>>> Standard because the oven no longer worked. >>>>> http://prc68.com/I/office_equip.html >>>>> >>>>> >>>>> Modern Ni-Cad batteries have much more capacity than older ones and no >>>>> longer have a memory effect. They are also very easy to charge, so >>>>> why not >>>>> just replace the old cells? >>>>> >>>>> >>>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>>> ailman/listinfo/time-nuts >>>> and follow the instructions there. >>>> >>>> >>>> _______________________________________________ >>> time-nuts mailing list -- time-nuts@febo.com >>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>> ailman/listinfo/time-nuts >>> and follow the instructions there. >>> >>> >> > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. >

I had my local BatteriesPlus rebuild my pack for my 105B about 4 years ago and it's still working well as I recall the cost was about 175. But I specified use best quality cells. Plus they have the proper battery welder and test gear and they have more vendor clout to get consistently good cells as opposed to getting them mail order or through the well known auction sites Content by Scott Typos by Siri > On Sep 15, 2016, at 1:16 PM, paul swed <paulswedb@gmail.com> wrote: > > Brookes comments are the facts you can not use simple charging circuits. > But smart charging circuits seem to be available on various sites for low > cost. It seems the RC modelers have helped us out. > The thing I will say is I have ordered new nicad C cell batteries from > major a major vendor and they did not last long at all for the cost I was > quite disappointed. > Regards > Paul > WB8TSL > >> On Thu, Sep 15, 2016 at 12:59 PM, Brooke Clarke <brooke@pacific.net> wrote: >> >> Hi Jeremy: >> >> I'm currently having fun playing with various rechargeable battery related >> stuff which includes Li-Ion cells. >> http://www.prc68.com/I/BatTst.shtml#Resistor >> The cells come in three configurations: >> 1. the raw flat top cell with optional tabs to allow easy soldering into a >> pack, >> 2. cell plus positive button cap which includes a Positive Temperature >> Coefficient (PTC) fuse and an over pressure vent, >> 3. fully protected, like 2, plus circuit that turns off the battery if >> charging and over voltage or loaded and under voltage. On these you can >> feel a wire/ribbon running from positive to negative under the shrink wrap >> and they are slightly longer. >> These configurations are independent of the flavor of Li chemistry. >> >> To go with any of the above you need a charger specific to the particular >> Li chemistry (the charging voltage is not the same) and if a pack you also >> need a either cells like 3 above or a protection circuit for the pack. For >> optimum performance in addition a tap between each virtual cell (made of of >> parallel cells) so that the charge can be balanced and a charger that can >> do that. This is not easy, witness the current recall of the Galaxy Note >> 7s phones. >> >> I would just use modern Ni-Cad cells mainly because of the ease of >> charging and maintaining them and use the existing charging circuitry. >> Li chemistry has advantages for portable equipment, but not so much for >> rack mounted equipment. >> >> -- >> Have Fun, >> >> Brooke Clarke >> http://www.PRC68.com >> http://www.end2partygovernment.com/2012Issues.html >> The lesser of evils is still evil. >> >> -------- Original Message -------- >> >>> Thanks, Brooke, I'll price new Ni-Cads. I wasn't thinking of lead-acid >>> (gel >>> cells) but rather lithium rechargeable, providing I can find a type that >>> won't catch fire and will work with the 105B'scircuits. >>> >>> Jeremy >>> >>> >>> On Wednesday, September 14, 2016, Brooke Clarke <brooke@pacific.net> >>> wrote: >>> >>> Hi Alex: >>>> >>>> Yes, I'm recommending Ni-Cad but NOT any acid type. >>>> >>>> -- >>>> Have Fun, >>>> >>>> Brooke Clarke >>>> http://www.PRC68.com >>>> http://www.end2partygovernment.com/2012Issues.html >>>> The lesser of evils is still evil. >>>> >>>> -------- Original Message -------- >>>> >>>> Hi Brooke, >>>>> >>>>> sorry I have to disappoint you; Ni-Cd batteries do not use any acid, >>>>> they >>>>> have K-OH kalium hidrioxid [potassium hydroxide for anglophone ] as >>>>> electrolyte and they are normally very air-tide, and widely used in >>>>> radios. >>>>> >>>>> 73 >>>>> >>>>> KJ6UHN >>>>> >>>>> Alex >>>>> >>>>> On 9/14/2016 4:45 PM, Brooke Clarke wrote: >>>>> >>>>> Hi Jeremy: >>>>>> >>>>>> It's a very bad idea to put any battery with acid in an enclosure that >>>>>> has electronics since if it vents the acid will etch the PCBs. >>>>>> Guess how I learned this. I got a great price on a Gibbs Frequency >>>>>> Standard because the oven no longer worked. >>>>>> http://prc68.com/I/office_equip.html >>>>>> >>>>>> >>>>>> Modern Ni-Cad batteries have much more capacity than older ones and no >>>>>> longer have a memory effect. They are also very easy to charge, so >>>>>> why not >>>>>> just replace the old cells? >>>>>> >>>>>> >>>>>> _______________________________________________ >>>>> time-nuts mailing list -- time-nuts@febo.com >>>>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>>>> ailman/listinfo/time-nuts >>>>> and follow the instructions there. >>>>> >>>>> >>>>> _______________________________________________ >>>> time-nuts mailing list -- time-nuts@febo.com >>>> To unsubscribe, go to https://www.febo.com/cgi-bin/m >>>> ailman/listinfo/time-nuts >>>> and follow the instructions there. >> _______________________________________________ >> time-nuts mailing list -- time-nuts@febo.com >> To unsubscribe, go to https://www.febo.com/cgi-bin/m >> ailman/listinfo/time-nuts >> and follow the instructions there. > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there.