Jumpstarted my stubborn boat literally 8 times on a charge and it wasn't even down to 50% after that. I have a Volvo 8.1 375hp motor. This booster pack is literally kept in my boat or my truck as a backup. Bonus to use it for charging damn near everything. The only thing that could make it better is an adapter to be able to jump start a boat via the boat's 12V receptacle. For older boats, you can't always get in the engine compartment.
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