You have to dig for serious discharging tests below 2V. I didn't see any. 2V cell voltage seems to be the limit: http://ecec.mne.psu.edu/Pubs/2010-Zhang-JPS.pdf Vasile On Wed, Dec 9, 2015 at 11:34 AM, James Cameron wrote: > G'day, > > What are the consequences of over-discharge of LiFePO4? > > We have a pack protection chip in our LiFePO4 packs, using either > Seiko S8232ATFT or a BM220 (origin unknown). The chip drives FETs on > the low side of the pack. The chip does over-charge, over-discharge > and over-current protection. > > The packs are two cells in series, 3.1 AH total. The chip has a trace > to the common between the cells. > > If left in storage for long enough, self-discharge and discharge > through the pack protection chip (54 to 150 microamps) makes the > pack useless. The pack will not accept a charge. Cell voltages are > below 0.4V. > > A workshop fix is to penetrate the casing and briefly bypass the > protection chip to bring cell voltages back up to 2V or so, then the > chip will let current into the cells. > > Are there any consequences of over-discharge apart from capacity loss? > > Disclosure; this is an assigned task; I'm being paid for it. > > I can't ask the manufacturer easily, because they aren't making them > any more. Our later models are LiPoly from another manufacturer. > > -- > James Cameron > http://quozl.netrek.org/ > -- > http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --=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 .