mnl wrote:would it be sufficient to connect to the bms say once a month or does it need to be connected constantly?
i just found out my 12V battery was installed in december 2014 at around 29k km and im at around 65k km i believe. while im driving, voltage seems to hang out around 12.8V. i was expecting the voltage to be 13V+ so its close, but not sure when i should start to worry. from reading a bit on here, it seems that the car would operate fine to even lower voltage levels. true? or is it time to start worrying now lol
I can't believe how much confusion persists regarding the 12v battery in the Leaf...and Lithium replacements.
The BMS is integrated into (good) 12v Lithium replacement batteries, so there's nothing to "connect". That's why (good) Lithium replacements are more expensive: you get what you pay for.
@GerryAZ pretty much outlined the only
dis-advantage to 12v Lithium replacements; the BMS is basically a bunch of electronics and has little to do with failure rates, which are much
lower than standard lead-acid (I don't know anyone
who hasn't had to replace their 12v battery in every
car they own).
All sorts of strange things can happen to a Leaf with a low 12v battery, including (obviously) it won't start. I don't recommend leaving a marginal 12v battery in a Leaf, which is why I replaced mine (as mentioned in the OP) over 4 years ago with no issues.