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Meet the NOCO Genius GENPRO10X3 3 bank onboard charger. 
This is the best performing onboard marine battery charger that we've came across from our boat rigging experience. And for a lot of different reasons.
Here's a few of them.
Runs cool. Compared to some other brands, this charger doesn't run hot. You don't need to worry about leaving any compartments open in your boat while charging.
Modes for all types of batteries. Whether you are using standard lead acid, flooded, AGM, or Lithium batteries. You select which mode for each of the 3 banks and the charger will ensure your batteries are getting the correct charge. 
It's a good size for a 3 bank onboard charger so you have quite a few options on where to mount it.
Charging output is 10 amps per bank. We recommend this for the serious angler that is fishing tournaments or back-to-back days that need to ensure their batteries are getting fully charged overnight.
If you're a more casual angler you might want to consider the even smaller footprint and budget-friendly NOCO GEN5 3 bank onboard charger.
  • Automatically detects battery condition and adjusts it's charging to repair and restore damaged batteries
  • 100% waterproof
  • Charges batteries drained down to 1 volt and with "Force Mode" detects batteries at 0 volts
  • Goes into maintenance mode after batteries are fully charged