IMO, the most important aspects of battery maintenance are to maintain the battery at 20% - 80% SOC (state of charge) and don't charge the battery when it's below 50 degrees F. If I'm going on a long ride I charge to 100% before the ride and make sure the battery is charged to 20% minimum after I return (you can use a voltmeter to determine this as there are charts with voltage vs SOC for each battery "type"). Luna chargers are relabeled AFAICT, but OK (I've had my first from them for 10 years and it still functions adequately), but very unlikely to fit your new battery. The last time I looked there were at least seven different connection systems for charger - battery since many companies want theirs to be proprietary. The charger that comes with your bike should be adequate.