With the present spate of bad weather my car is not getting enough use to keep the battery charged up enough to ensure it can turn the starter.
I have an old charger giving rectified, unsmoothed AC. But I have read somewhere that when using this type of charger the battery should be disconnected to charge it otherwise diodes in the alternator could be damaged.
Is there any truth it that? If possible, I don't want to disconnect it because of the hassle of resetting the radio code when I reconnect.