Modern EVs lose 1% charge per day when parked, driven by security systems and thermal management
By Eve
Electric vehicles typically lose 1% of their state of charge per day while parked under normal conditions, though actual drain is often lower, according to industry analysis. The main causes of vampire drain include security systems such as Tesla Sentry Mode, 12 volt battery top ups, and thermal management systems that maintain safe battery temperatures. Cold weather can also reduce displayed range overnight without actual battery depletion, and operators are advised to disable non essential features and keep vehicles plugged in during extended parking periods.
Why it matters
For fleet operators and charging infrastructure planners, understanding baseline vampire drain helps size depot charging capacity and predict energy demand patterns. The 1% daily loss figure provides a benchmark for calculating overnight charging requirements at workplace and residential sites where vehicles sit idle for extended periods.
Source
- Original title
- “How Much Range Do EVs Lose When Parked? (And How to Stop It)”
- Published
- 20 October 2026
- Updated
- 21 October 2026
In this story
- Topic
- Electric Vehicles
- Place
- Global
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