Totally. I'm not necessarily proud of it, but my 144v pack of lifepo4 must have sat there for at least a year and a half and was rock solid 3.3v much across the board the whole time, same as when I brought the crates home. All within .05v of each other. Almost freakish!
early days on that project, I went ahead and picked up a single cell lithium charger off of ebay for like $20 - I want to say it was 6A and I remember the cutoff wasn't great but not too bad, might have been 3.8v? I mean, don't quote me, never needed to use it, but just saying they are out there and cheap. On Sat, Dec 28, 2013 at 9:26 PM, Marcus Reddish <[email protected]>wrote: > 1. Put on shelf in garage. > > 2. Come back several years later. > > 3. End of story. > > Please do not ruin your cells by charging them with a 12v bat charger as > suggested. They will not be balanced and the higher cells will be damaged. > > I have not heard of LifePo4 discharging, even when left for several years. > Many projects take a year or two to put together. The batts may be 2-3 > years old before they even get on the road. No worries, that's why you > bought LifePo4! > > Cheers, > > > On Sat, Dec 28, 2013 at 5:01 AM, Willie2 <[email protected]> wrote: > > > On 12/28/2013 05:43 AM, matt lacey wrote: > > > >> Hi Buddy, > >> > >> are these cells brand new - never used? > >> > >> if so, they are already at 50% soc - they come from the factory like > that > >> after the capacity test and sort process > >> > >> just store them as is - they don't discharge (I have cells that have > been > >> in storage for 3 years that are all still exactly 3.30v) > >> > > > > I generally agree. They come about 50% charged. There is no practical > > way to determine state of charge without cycling them. Which is not very > > practical. I have not had cells go bad from being stored several years. > > I've been tempted to connect them in parallel and put a small charger > and > > a single bypass module on them. I'm sure they do self discharge, it just > > seems to be not very significant. Apparently, it is less than the > > generally advertised rate of 1% per month. > > > > I think it is safe to store them for 3+ years without replenishing the > > charge. > > > > OTHO, I have had cells go bad after being stored in a car for only a few > > months with the BMS modules active. > > > > _______________________________________________ > > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/ > > group/NEDRA) > > > > > > > -- > Marcus Reddish > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131228/b99286e8/attachment.htm > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA ( > http://groups.yahoo.com/group/NEDRA) > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131229/5ffad944/attachment.htm> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
