Here is a Bluetooth battery tester that lets you easily monitor the health of your car battery on your smartphone. The ThinkEasy battery test clip can be used on many common automotive batteries on the market, including Gel, EFB, and acid batteries.
ThinkEasy is pretty easy to use. Simply attach the clamp on the positive and negative terminals, and you will be able to check your battery on your smartphone. You can see battery health, start system, charging system tests. More information is available here.
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