How to Store an EV Long-Term: The Battery Checklist

Going away for weeks or months? A few simple steps before you park will protect both the main battery and the 12V system. If you're wondering how to store an EV for months, or what happens if an electric car sits unused, here's the complete long-term storage checklist.

Whether it's a long trip, a working stint or a second car that sits idle, every EV owner eventually faces the same question. What happens to the battery if the car isn't driven for a while? Left to its own devices, a stored EV can lose charge, stress its 12V battery and even damage the main pack. The fix is a small amount of planning before you walk away, plus a monthly top-up while you're gone. The good news: proper storage is simple, and most of it comes down to charge level.

Why storage matters

When a battery sits for a long period, it slowly self-discharges. Understanding EV long-term storage starts with that simple fact. If it's left deeply discharged, real damage can occur. Cells can be pushed into a state they struggle to recover from. The same logic applies to the smaller 12V battery, which powers the car's systems while it sleeps. Both need the same kind of attention before a long break, and both are easy to protect with the checklist below. Planning avoids both problems, and neither step takes more than a few minutes.

Set the right charge level before you park

The single most important step is the state of charge when you leave the car. Electric car storage tips almost always start with this:

• Charge to between 30 and 60 per cent before storage. This is the sweet spot. That keeps the battery healthy without the stress of sitting at full charge for weeks.

• Never store the car at a very low charge. A battery left nearly flat for weeks is at the highest risk of damage. Don't wait for the warning light to think about it.

• If the battery is low, charge it first — even a short top-up makes storage far safer.

Charge it monthly while stored

Self-discharge doesn't stop just because the car is parked, which is why EV battery storage maintenance needs a monthly check-in. If the car will sit for a while, give it a charge about once a month. This keeps the battery from drifting into a harmful low state and keeps the 12V system topped up. It's a five-minute habit that prevents most storage-related battery problems — and it's worth adding to your calendar if you're away long-term.

Choose a sensible place to park

Where you store the car matters too:

• Park in a cool, dry, ventilated spot — a garage or undercover area is ideal. Avoid extreme heat and direct sun for long periods.

• Avoid low-lying areas prone to moisture. Damp conditions are hard on the car and its electrical systems.

• If you're away for a very long time, disconnect or protect the 12V battery per the owner's manual, and consider a trickle charger to keep it topped up.

Before you drive again

When you return, don't be surprised if the range estimate looks a little lower than you remember. Some discharge during storage is completely normal. Check the charge level, top up if needed, and give the car a drive to let the systems recalibrate. A few minutes of driving usually restores everything to normal. The tyres may also be a touch low after weeks of sitting. A quick pressure check completes the routine.

The bottom line

Long-term EV storage is mostly about charge level. Park at 30 to 60 per cent, top up monthly, keep the car out of the weather, and check the basics when you return. Follow that, and your EV will greet you exactly as you left it — ready to go whenever you are.