On Sat, Jun 29, 2013 at 3:24 PM, veegee wrote: > I have a very old (but working) 1200VA APC UPS which requires two new > 12V lead-acid batteries in series. I want to try and install a different > type of battery chemistry that would yield a much longer service life > than the ~3 years generally specified for sealed lead-acid UPS batteries. > > I'm thinking about LiFePO4 because I've heard it will last 10+ years. It > also seems to have very good power density. LiFePO4 may give you 3x the service life, but will also likely cost 3x as much. You're also in for quite a bit of a project replacing the charging algorithm and remaining capacity measurement algorithm. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .