12 volt battery question please
My batteries are very difficult to remove for winter. Plus I may want to take up ice fishing/camping again!! I am thinking about building hard foam insulation around the batteries to help keep them ...
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3 tons wrote:
Thanks for relating to us your sage experience and appropriate safety cavet…Though I believe that LFP’s are considerably safer than higher power density phone batteries (likely because of LFP’s lacking cobalt chemistry) there’s little doubt that lithium types are a different animal… When doing a true load test on my replacement 200a/h LFP cylindrical-cell drop-in, I was made acutely aware of this when once ‘confirmed’ to be at zero percent rated SOC, I decided to switch on the microwave oven to see what might happen and was amazed that it ran perfectly while drawing a whopping 136 (or slightly more) d.c. amps at zero SOC!! - CRAZY!! Turns out that this battery didn’t come to a stop until at 215 consumed a/hrs…FWIW, I have no idea whether this is typical of other drop-ins (??), but YES an altogether different kind of animal indeed…
3 tons
Respect is required with any high density energy.
Early Lithium batteries were pretty unstable, while newer technologies have reduced that instability the problem now becomes dealing with defects internally in the cells, only takes one bad apple in that pack shorting out due to contamination in the manufacturing process (not unusual either, was a huge Lithium battery recall a few yrs back involving just about every laptop manufacturer).. The cells themselves can hold a considerable charge beyond what the BMS cuts off at so a cell can still have plenty of energy to overheat if shorted or misused even if the BMS disconnects external connections as you have noticed..
