Honestly the regular battery tender junior High efficiency works fine. No need to get anything else. I plug mine in after I ride. Since I have the DDA+ GPS module, I have the tender, why not use it. .75a is to maintain the battery, slower is better, with more charging power, its great if you have a dead battery and you're trying to get the bike started, but with higher amps, you have the risk of damaging the battery or reduce the battery life.