One thing about NiCad is the possibility of thermal runaway.
EVDL Administrator wrote:
This is also true of lead batteries, no?
Of course. It's true of *all* batteries. If something goes wrong with the charger, and it keeps forcing energy into a fully-charged battery, that energy has to come out somehow. It will normally come out as HEAT!
Now, that battery might not be combustible. But it will gas, and could even boil its electrolyte, or produce steam, or melt down its plastic case, or deform something enough to cause a short circuit. Any of these situations could lead to a fire, too.
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