NOCO XGC4 56W Power Adapter for Genius Boost GB70, GB150, GB500

The NOCO XGC4 is the 56-watt power adapter that recharges your Genius Boost jump starter. If you run a GB70, GB150, or GB500 on board, this is the charger that tops it back up fast. It pushes 4 amps at 14 volts DC, which NOCO rates at up to five times faster than recharging through a standard 2-amp USB port. When you've just used your booster to bring a dead cranking battery back to life, you want it full again before the next trip out. This adapter gets you there without the overnight wait.

What you're getting is a dedicated AC/DC charging adapter, not a jump starter itself. It plugs into shore power or a dock outlet, and the 60-inch AC and DC cords give you enough reach to set the booster on a shelf or in a locker while it charges. The housing is black and waterproof, so a little spray or a damp locker won't kill it. That said, we still tell folks to keep it in a ventilated, dry spot when it's charging. We've seen condensation build up inside a case that got stored wet through a New York winter, and that's the kind of thing that quietly shortens the life of any electronics on a boat.

The XGC4 is built for the Genius Boost Ultra Safe lithium jump starters, specifically the GB70, GB150, and GB500. Those are the mid and large boosters, the ones with enough punch for outboards, diesels, and bigger cranking banks. If your booster is one of those three, this is the correct adapter. It uses a 2-pin plug that seats into the charge port on the unit. Make sure it clicks in fully every time. A plug that's left half-seated can corrode over a season, and then you're chasing a charging fault that's really just a dirty connection.

On most boats we rig this up right near where the booster lives. If you keep your GB70 in a center console, mount the 2-pin plug close by so the cord isn't strained every time you pull the unit out. On 25 to 35 foot boats, the 60-inch cords usually reach through an existing chase tube, and if you run them through a bulkhead, seal the penetration so you don't undo the waterproofing you paid for. In a small outboard console, tuck the adapter in with a couple of zip ties so it doesn't bounce around and chafe underway. Vibration is the enemy of any charger left loose in a locker, and a few minutes with a zip tie now saves you a headache later.

Here's the honest take. Four amps is plenty for topping off a booster between trips, and for most weekend and coastal boaters it's exactly the right size. If you're a liveaboard leaning hard on a GB150 day after day, you may find 4 amps feels slow, and some heavy users keep a second unit charging so they always have a full booster ready to go. On a diesel boat pairing this with a GB500, keep an eye on voltage at the plug when you're drawing off an onboard 14-volt system, so you know you're getting a clean, steady charge. None of that is a knock on the adapter. It's just knowing your own use and rigging around it.

Bottom line, if you own a Genius Boost GB70, GB150, or GB500, the XGC4 is the charger that keeps it ready. Waterproof housing, long cords, and a fast 56-watt charge in one simple package. It's a piece of gear that does one job and does it well, and it's the one you'll be glad you have the next time someone at the dock is standing over a dead battery.