LeftieBiker wrote:The difference between an EV and a traditional ICE vehicle is that the battery in an ICE vehicle has to have enough capacity to deliver literally hundreds of amps of current to the starter motor in order to prod the beast to life. In an EV, the battery only needs to power the computer systems that command the high voltage battery's contactor relay to close. So the 12V battery in an EV is much smaller and will be drained much faster if it's under any significant continuous load.
Actually, the 12 volt battery in my Leaf is about the same size as the battery was in my 1986 Civic Si. It's also a standard "starting" type battery, unfortunately (deep cycle would be much better). Still, it could start a small ICE if necessary. I think it's that size just because of accessory loads
Interesting, I wasn't aware that Leafs had full-sized batteries. I think that's the exception rather than the rule for EVs. Even my Prius C, which actually has an ICE engine, has only a very small 12V battery because the engine is started by the electric motor, which is driven by the high voltage traction battery.