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The battery in the remote/key itself usually does not charge when in the ignition or vehicle.If the vehicle started and ran with a new battery in the remote for some time and has now acted up again what can happen though is the remote itself can short out internally and cause issues with draining the battery to where the remote/key itself would need replaced as an assembly to correct this fault here.
If you can try another new battery in the key fob and if it works then I suspect the issue is in the remote/key fob itself with it needing replaced to correct this issue here.If it does not work with another new battery it may have already failed internally due to the short with it needing replaced.
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