[dotancohen]

Lead acid, hence the reference to 12.6 volts. Are the Li-ions 12.6 volts as well? I thought they might be 16 volts.

[vardump]

There are some Li-ions that are supposedly drop-in replacements. However I think many are 16 volts.

There's some push to go to 48V+ Li-ions. We shall see.