What do you mean? Lots of people have "onboard" chargers. I would plug it in anytime you can if it is a smart charger that will turn on/off automatically and has a float feature. If you have a regular counter top charger that is fine. The only advantage to an onboard charger is that it is already wired in and all you have to do is plug it in to an AC power source. Both counter top or onboard chargers can have multiple banks, smart charging programs, etc...
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