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Optimate 4 charger vs. BMW Motorrad Battery Charger

21K views 17 replies 12 participants last post by  Neep!  
The pandemic had left me stranded away from home (and my R9T!) for six months less three days. The charger remained plugged in for the duration. When I got back, I unplugged and hit the start button. With a shake of it's head (as if to scold me for the neglect :) ) the bike started and idled without missing a beat.

I use the Optimate charger.