Do electric car batteries lose their stored energy over time?

Do electric car batteries lose their stored energy over time?
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Answer :

All batteries have a self-discharge rate. The rate varies by type of battery, age of battery, level of charge, and temperature. If you estimate a lithium ion battery at 2–5% per month, you can figure your car will start just fine after sitting 2 weeks – if there are no other current drains like alarm system, keep-alive circuitry, wifi, bluetooth, etc.
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