I am not a lithium battery expert. But with any kind of battery, I would do a load test to identify the problem cells.
Put 20-40 amps on the fully charged battery, and measure the voltage of each cell in turn. The stinkers will quickly reveal themselves. Be aware that you may find a REVERSE voltage on one or more cells. This is an especially bad sign. Remove the weak cells from the string and give them special treatment. Charge them individually and test their capacity (discharge at a nominal rate such as 20 amps or more until they reach their low voltage limit, recharge, test again, recharge). You can use an amp-hour meter to measure capacity, or just time how long they last and multiply decimal hours by average current in amps to get approximate amp hours. If you can get them to charge fully and show about the same amp hour capacity as the rest of the battery, charge them up, put them back in, use them, and see how it goes. I would replace any that test well under the capacity of the other cells in the battery. David Roden - Akron, Ohio, USA EVDL Administrator = = = = = = = = = = = = = = = = = = = = = = = = = = = = = EVDL Information: http://www.evdl.org/help/ = = = = = = = = = = = = = = = = = = = = = = = = = = = = = Note: mail sent to "evpost" and "etpost" addresses will not reach me. To send a private message, please obtain my email address from the webpage http://www.evdl.org/help/ . = = = = = = = = = = = = = = = = = = = = = = = = = = = = = _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
