Just to follow up on the thread I started about my Prius with add-on plug-in battery pack. As it turned out, I discovered that 40Ah replacement CALB, Winston or Sinopoly batteries are made of Unobtanium in the US, and shipping costs from overseas for a single battery are prohibitive. So I followed the advice of several on and off list suggestions (thank you) to buy a single cell electronic charger, charge the suspect battery, and then load test it.
This I did by charging the suspect battery separate from the pack until it was about the voltage of its brothers, which is to say, still flat at about 3V. At Robb's suggestion, I then charged the entire pack using the car's ICE to charge the factory traction battery to full. Then I discharged that energy into my add-on battery pack. At that point pack V was high enough that I could use the battery management system and system charger I have to bring the pack to full charge and balanced voltage. Since then I've run the battery pack from full to flat a few times, and run between 2-40 miles on battery only, no problems. So, fingers crossed, I think I am back in business without replacing the suspect cell after all. I think the problem may have been that I ran the add-on battery pack a bit beyond flat, to the point that pack V and some individual cell voltages were low enough that the BMS would not allow me to charge the pack using my on-board charger. In the future I'll switch the system off as soon as it runs out of juice, so I can safely charge using the BMS. Thanks again for your help, Mike -- Sent from: http://electric-vehicle-discussion-list.413529.n4.nabble.com/ _______________________________________________ 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)
