I've recharged mine several times. After extended periods in the Camaro, and then when it became a hand-me-down for the motorcycle after I blew the engine in the Camaro. The motorcycle alternator/regulator/something is weak and the battery will get low, so after a couple weeks of riding, I throw the charger on it to bring it back up to 100%. It's an old one, no special program or anything. I'll hit it with 10amps for about 4 hours (longer if I forget - luckily the charger tapers off on its own...).
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