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I have built a battery level indicator and have tested with a 12V battery Would it harm my arduino board if I connect a 48V battery? - Arduino Stack Exchange
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DC 9~100v 100A ~400A Lifepo4 Lead-acid Li-ion Lithium Capacity 12V Battery Monitor Hall Coulomb Tester Digital Voltmeter Ammeter - AliExpress
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Amazon.com: Battery Monitor, Voltage Capacity Tester 12V 24V 36V 48V 60V Battery Capacity Indicator Iron-Lithium & Lead-Acid Battery Meter Voltage Capacity Percentage Indicator : Automotive
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TUTORIAL: How to Make a DIY Lead Acid Battery Capacity Checker Tester - Arduino LCD Part 2/2 - YouTube
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