I think the short answer is yes. Any thoughts about this?

BTW, page EV-5 in the 2017 Leaf owner's manual says:

While the vehicle is not in use
When the EV system is off for an extended time,
the 12-volt battery may be automatically charged
for a short period of time on a regular basis.
  • So what are you planning for the charging on a regular basis?
    – Solar Mike
    Commented Mar 14, 2019 at 19:04
  • I am aware that the traction battery will slowly loose it's charge, at what rate it does this is one outstanding question I have. Experience thus far is that the rate of loss is fairly low. The car may need to be charged after 3 months. I plan to have someone check it. Commented Mar 14, 2019 at 19:16

2 Answers 2


The accessory battery for an EV "energizes" the electronics that manage the rest of the car. It's critical to keep the 12v battery healthy. A battery tender is highly recommended (not a trickle charger) as it maintains the battery at a safe level and doesn't try to push more electrons into it as time passes.

The main pack would be best placed at a storage voltage level, approximately 50 percent discharge or remaining power. Many of today's EVs will charge to 80% to reduce the stress on the pack at the top end of the charge. Our Rav4EV charges to 80% but allows "extended range" at the press of a few screen buttons. It also advises to not do this frequently.

Drive your EV half the usual distance, pop on a battery tender and you should not have to worry about the 3 month charge. If it does get charged, you'd have to also have it driven to drop off the top fifty percent to place it back into storage.

Alternatively, have the 3 month charge interrupted at a 50 percent full point.


Yes, it's ok to do this.

We let our Leaf sit for over 6 months without being charged, but note well that we first unhooked the 12V battery while we were gone.

The results: both the 12V and traction batteries were fine when we returned. Neither had lost an appreciable amount of charge.

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