Four 3.6 cells are equivalent to a "12V" PbSO4 battery. If you put four cells in series you can use a car charger. As long as it doesn't make more than 14V you can omit using a BMS. It is more trouble to make it be a 1/2C SOC.
You need an Ah meter for that. A JLD 404 and a shunt is a nice investment. Then you need a discharge load. I bought a 200W 200Ohm resistor for doing this, but it won't be a fast discharge. You could get a lower resistance higher wattage resistor and go faster. You can use the JLD and a relay to turn off the charger after a certain number of Ah. Give it a full charge and then burn off 20Ah from there. However, I don't see why you need to be exact on the 1/2C SOC for storage. What is that about? Why can't it be charged up to 14V/4 = 3.5V? You could probably put a 4 cell pack in parallel with the PbSO4 battery on your ICE to get a charge. 12 ICE are regulated to just under 14V. On Fri, Dec 27, 2013 at 5:48 PM, Buddy Mills <[email protected]> wrote: > 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) > > -- Put this question to yourself: should I use everyone else to attain happiness, or should I help others gain happiness? *Dalai Lama * Tell me what it is you plan to do With your one wild and precious life? Mary Oliver, "The summer day." To invent, you need a good imagination and a pile of junk. Thomas A. Edison<http://www.brainyquote.com/quotes/quotes/t/thomasaed125362.html> A public-opinion poll is no substitute for thought. *Warren Buffet* Michael E. Ross (919) 550-2430 Land (919) 576-0824 <https://www.google.com/voice/b/0?pli=1#phones> Google Phone (919) 631-1451 Cell (919) 513-0418 Desk [email protected] <[email protected]> -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20131228/bbf3d8a2/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)
