The cause seems avoidable for a 500e
lifetime of a 12V battery in an EV, it seems to be considerably shorter
. BatteryUniversity.com seems to be pretty knowledgeable, & they explain how high-current gas engine cranking LOWERS
, & how HEAT
is a pretty big factor. So I shielded the whole side of the battery from the heat of the adjacent onboard charger & then me & several other 500e users had them last over 5 years.
It seems unlikely that early deaths are from over-charging, or from lack of high-current, since ours were also subject to those conditions for 5+ years. BatteryUniversity says here
that it's best to "charge as often as you can", & here
they say that sulfation is LESS
when charged at 14.7V (2.45 volts/cell times 6 cells = 14.7V)
500e drain while parked is very low. Other EVs might not have a hot charger by their 12V, but most have much higher drain, giving them much deeper, damaging cycles.