Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.2 9/5/84; site umd5.UUCP Path: utzoo!watmath!clyde!burl!ulysses!gamma!epsilon!zeta!sabre!bellcore!decvax!linus!philabs!cmcl2!seismo!umcp-cs!cvl!umd5!don From: don@umd5.UUCP Newsgroups: net.analog Subject: RE: Electronics wearing out Message-ID: <616@umd5.UUCP> Date: Tue, 25-Jun-85 17:57:35 EDT Article-I.D.: umd5.616 Posted: Tue Jun 25 17:57:35 1985 Date-Received: Sat, 29-Jun-85 03:01:25 EDT References: <2663@decwrl.UUCP> <508@edison.UUCP>, <172@almsa-1> <221@unccvax.UUCP> <657@lll-crg.ARPA> Organization: U of Md, CSC, College Park, Md Lines: 33 > What about replacing the 7 year lithium battery after 4 years by > connecting a new battery in parallel and then removing the other. > > Doug Manatt *** REPLACE THIS battery WITH a new one *** Doug, I don't think that would be too good an idea as lithium batteries don't take kindly to being current sinks. One, the battery could explode; two, the battery's life can be shortened considerably. The batteries we (APCOM, Inc.) use even have warnings about too much heat just from the soldering operation to install them on a PC board. The fresh battery would attempt to charge the weak battery while they are connected in parallel. On the other hand, if there is a diode in series with the battery (what we do -- battery back-up), you could possibly do something like you suggested, but one would first need TWO batteries. On battery one, connect a diode in series, and connect the cathode end of the diode to the cathode end of the existing diode on the PC board. Next disconnect the old battery. Now install a new battery in place of the old one. Lastly, disconnect battery one and its diode. Voila !! -- --==---==---==-- ___________ _____ ---- _____ \ //---- IDIC ----- _\______//_ ---- ---------- ARPA: don@umd5.ARPA BITNET: don%umd5@umd2 SPOKEN: Chris Sylvain UUCP: {seismo, rlgvax, allegra, brl-bmd, nrl-css}!umcp-cs!cvl!umd5!don