Not only are all electrified cars routinely "self-charging" by virtue of their regenerative braking but modern conventional petrol/diesel are optimised to use off-throttle over-run momentum to recharge the electrical system.
Re the comment, above, made by RT, this is indeed true. Many modern ICE engines employ quite sophisticated alternator management systems (AMS), which once the battery is sufficiently replenished by the alternator (e.g. after a cold morning start) will 'settle' such that when cruising at a steady speed, accelerating, or hill climbing, the battery volts will 'settle' happily at around 12.5 volts, with little or no current being drawn from the alternator, to save fuel. However since the ignition system and other systems constantly draw on the battery, the AMS will periodically activate to give the battery a booster charge when the brakes are applied and when travelling down hill. The AMS intelligently 'adapts' throughout each journey with the objective of saving fuel by operating the alternator charging system to optimise battery charge, typically keeping the battery charge between half and three quarters fully charged from week to week, without any need for periodic external charging to top it up.
Edited by Firmbutfair on 13/07/2020 at 13:36
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