I'm using two parallel 20ah 36v ebike batteries in a golf cart with good
success. I had been working with the mental model that all batteries in
parallel should be of equal capacity. On more careful consideration, I
now see no reason to have equal capacity batteries. That is, I might
use one 20ah and one 60ah in parallel. Can anyone point out a flaw in my
thinking?
I again comment that I am highly optimistic on the possibility of using
chinese ebike type batteries in relatively large EVs. The VERY large
advantage over using a single series of large lithium cells is that the
BMS/protection is built in and integrated. Each battery balances it's
cells and protects itself from both over charge and over discharge. No
rats nest of miniBMS modules to be protected from the elements. And
the price is very attractive. Single lithium cells are priced around
$1.20/ah. The ebike battery equivalent is around $1 delivered in the
USA. And as low as about $.70 in China. Another very significant
advantage is the modularity. Bad batteries can be easily swapped out.
Batteries can easily be added for increasing range and power.
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