Hi Buddy, Probably the best thing is indeed to store them in a cool place (between room temp and freezing) after charging them to approx 3.45V. Probably the best is to get a charger (or a current-limited supply) that can be set to this voltage and will charge the parallel cells for a week or so, then you disconnect them all and once in a while you can check if they are still sitting at acceptable voltage - it should take longer than a year for them to self-discharge if they are manufacturered without defect.
If you can't find a supply let me know and I can send you a 3.45V 3A supply which will take at least 2 weeks to recharge your cells if they are low. I am currently using one to test cells. Regards, Cor van de Water Chief Scientist Proxim Wireless Corporation http://www.proxim.com Email: [email protected] Private: http://www.cvandewater.info Skype: cor_van_de_water Tel: +1 408 383 7626 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Buddy Mills Sent: Friday, December 27, 2013 2:49 PM To: 'Electric Vehicle Discussion List' Subject: [EVDL] Storing / charging LiFePO4 What is a low cost way to keep/store batteries. I have 18 LiFePO4 cell left over from my switch from lead setting in a box. I got extras for backup and need to store them until I might need them. I know they should be a stored at ½ charge but is there anything else I need to do. I also would like recommendation on a low cost way to charge them for their respite. I would prefer something out of the box that I can purchase. I would be willing to charge them in parallel, individual or groups. And last but not least can someone tell me how I know that they are at ½ charge for storage. The specs are 40ah with 3.6 volt max, 2.5 volt min and nominal of 3.2. Thanks in advance, Buddy Mills <mailto:[email protected]> [email protected] Look mom, no gas. <http://www.evalbum.com/2887> http://www.evalbum.com/2887 Disclaimer: No animals were harmed or killed in the process of writing this email. Any stories to the contrary are, for the most part, either fictional or greatly exaggerated. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131227/cd7d1c89/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) _______________________________________________ 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)
