Determining Your Boat Battery's Health 

Don't find out the hard way that your boat battery is dying! Use some of these basic tools/gadgets and even fishfinder settings to get a handle on your battery's state of health at any time. If you have lithium batteries on your boat that don't already have Bluetooth and monitoring built it, then check out some of these add-on modules linked below that turn your batteries into Bluetooth capable and monitored over an app:
Victron Smart Shunt
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Victron Smart Battery Sense
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