I use these https://www.conrad.nl/nl/eve-12-aa-axial-er14250-speciale-batterij-12-aa-axiaal-soldeerpin-lithium-36-v-1200-mah-1-stuks-650772.html Met vriendelijke groeten Regards Frans info@ElectronicsAndBooks.com http://ElectronicsAndBooks.com WEB ElectronicsAndBooks DOT com TEL +31-(0)6-20577501 Netherlands Discere ne cesses -------------------------------------------- On Sun, 1/24/16, Dr. David Kirkby (Kirkby Microwave Ltd) <drkirkby@kirkbymicrowave.co.uk> wrote: Subject: Re: [volt-nuts] Wanted - UK source of a replacement battery (type LX 1634) for HP 3457A 6.5 digit multimeter To: "Discussion of precise voltage measurement" <volt-nuts@febo.com> Cc: "hp_agilent_equipment@yahoogroups.com" <hp_agilent_equipment@yahoogroups.com> Date: Sunday, January 24, 2016, 11:08 PM On 24 January 2016 at 21:24, Poul-Henning Kamp <phk@phk.freebsd.dk> wrote: > -------- > In message < > CANX10hADbw1u9eJC8_ZgsK94k8Az8vzG4oSe+XnGfWRALi0B0w@mail.gmail.com> > , "Dr. David Kirkby (Kirkby Microwave Ltd)" writes: > > >Opening the meter up, I see the PCB shows "BT 601". There's no name on the > >battery I can see, but the type number of LX 1634. The voltage measured on > >my 4.5 digit handheld DVM is 3.03 V. Googling around > > My guess is that this is a 3.6V Lithium-Thionyl battery, and if it is > only 3.03V now, you're very likely tethering right on the brink. > > The most reputable vendor in this space is Tadiran, and they charge > accordingly. > The post by Glenn (WB4UIV) in the link https://groups.yahoo.com/neo/groups/hp_agilent_equipment/conversations/topics/48964 does say that it is Lithium-manganese dioxide (Li-MnO2). That information was apparently taken from the battery manufacturer's web site. So I don't think it is a Lithium Thionyl Chloride cell, although I'm very tempted to fit one, as I can get one easy enough and I can't see the extra voltage would do any harm given the SRAM is 5 V. The SRAM actually gets about 4.8 V when on mains, so even a fresh Lithium Thionyl Chloride cell, which would be more than 3.6 V off load, would not be too much for the SRAM. So I think I am safe for now, but given the cell is at least 11 years old (probably much older), it is living on borrowed time. Dave _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.