I suggest using double-layer super capacitor* intead of Lithium backup battery. These capacitors stores energy for a long time, like a battery and they have much longer lifetime. 0,2 F capacity should be enough for RTC backup on several hours, maybe days.
* http://cz.farnell.com/jsp/search/browse.jsp?N=1002210+5117013+5087727+5400445&No=0&getResults=true&appliedparametrics=true&locale=cs_CZ&catalogId=&prevNValues=1002210+5117013&filtersHidden=false&appliedHidden=false&originalQueryURL=%2Fjsp%2Fsearch%2Fbrowse.jsp%3FN%3D1002210%26No%3D0%26getResults%3Dtrue%26appliedparametrics%3Dtrue%26locale%3Dcs_CZ%26catalogId%3D%26prevNValues%3D1002210 Best regards, Martix 2010/10/24 Alfa21 <freerun...@my.is.it>: > 2010-10...@20:44 Benjamin Deering >> Has anyone done this replacement before? any gotchas? > > no, but I think it's not too difficult if you have a little experience with > DIY. > I've this (known) problem too but I'm afraid if I replace the battery it'll > die as the old one... not sure... but I think I can live with that and so I > never remove the main battery. > >> >> Also,as anyone found a source for replacement torx case screws? > > I think it's easy to find in any good hardware shop (not computer-hardware > eh! the one that sells you screwdrivers, electric drills & Co.) > > -- > ALFA21 IS PROVIDED "AS IS" AND WITHOUT WARRANTIES OF ANY KIND, EXPRESS OR > IMPLIED. > > _______________________________________________ > Openmoko community mailing list > community@lists.openmoko.org > http://lists.openmoko.org/mailman/listinfo/community > _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community