This neat little device is now on sale at Canadian tire. Under license this is known as the Nautilus Intelligent Battery Guard for 12V Batteries, it’s made by the www.batterybrain.com folks. I plan to use two of these in a dual battery configuration but I can see the value in just having one on your main battery. Even if you’re careful and charge your battery each time you return to shore sometimes you can find yourself with out enough juice to crank to starter because you've been cranking the cd-MP-3 tunes all day.
Reg: $89.99
Product #11-3002-2
HOW
Battery Brain prevents a dead battery by using patented technology to continually monitor a battery’s charge strength and isolate it from any possible energy drainage, ensuring enough charge is preserved to start the engine.
The Battery Brain unit can be mounted in various configurations on the positive terminal of the vehicle battery. It monitors the voltage in the battery and if this drops below the prescribed level needed to start the vehicle (e.g. 12.1V), a brief timed sequence measures whether this is a temporary drop that recovers quickly.
If not, Battery Brain disconnects the battery from the vehicle’s electrical system to preserve the charge. The battery will then typically recover (e.g. to around 12.6V) but it will at very least retain enough charge to start the engine.”
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