is this charger and 3 batteries?

Yes. 3 batteries and the charger.

Only charge 2 at a time? And then have to reset?

hi, charger can charge 1,2or 3 battery at a time.

I have one battery that will not work how do i go about getting it warrantied?

I had a battery that was 2 months old and suddenly wouldn't take a charge. I contacted Amazon Customer Service and they warrantied it and shipped me a new battery.

Battery Weight	43 Grams
Unit Count	3 Count
Battery Cell Type	Lithium Ion
Recommended Uses For Product	Camera
Reusability	Rechargeable
Battery Capacity	1680 Milliamp Hours
Voltage	3.7 Volts
Compatible Phone Models	Gopro Hero 4 AHBBP-401 Camera

Batmax 3Packs AHDBT-401 1680mAh Battery + LED 3Slots USB Charger for Gopro Hero 4 Battery Go Pro Hero4 AHBBP-401 Action Camera Accessories

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