Some older fobs do recharge when in the car’s ignition. My old bmw did this and it was recommended to swap the keys from time to time to make sure they didn’t r

Some older fobs do recharge when in the car’s ignition. My old bmw did this and it was recommended to swap the keys from time to time to make sure they didn’t run out off battery. I guess this can’t be the case with the “keyless” keys though