The warranty period is 3 years from the date you receive it.
We only replace the battery with a new one for free due to manufacturing failure.
We will test the battery for voltage/resistance/appearance and other issues before shipping, we can only make sure the single battery is good before shipping.
Upon arrival, you can test the battery within 1 week, if you find any problem, please contact us for refund or replacement. Buyer is responsible for shipping cost for any return action.
If there is a problem, please contact us Thank you