>>2887083
>but can’t find a good conversion for how much phone charge you get from a power tool battery.
Look at the watt-hour rating (Wh) on batteries. That will tell you. Subtract maybe 10%-20% for whatever conversion losses and you will get your amount of charges.

1W = 1V x 1A. So if you have a phone with a typical lithium battery, it’s going to be 3.6/3.7V, let’s call it 4V for simple math and because M12 batteries are actually 10.8/11.1V and not 12V (3 lithium battery cells in parallel). Phone battery is about 3000mAh-4000mAh, that’s going to be 3Ah x 4V = 12Wh. M12 2Ah battery is 12V x 2Ah = 24Wh. M12 4Ah battery is 48Wh. So 2 phone charges off a small M12 battery, 4+ full phone charges off a 4Ah+ M12 battery. Your 10,000mAh Anker power bank you normally use to chargr the phone will be 10Ah x 4V, so 40Wh (assuming it’s an honest rating and not some aliexpress Chinesium battery that claims 200000mAh and has sand-filled cells).

Most batteries will have the Wh rating on the bottom of it if you read the fine print.

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