• 1) Do not remove the battery from its original packaging before use.
• 2) Do not put the batteries together sporadically to avoid accidental short circuit.
• 3) Do not heat the battery above 100°C or burn it.
• 4) Do not charge the primary lithium battery.
• 5) Do not weld directly on the surface of the battery. Use a battery with pre installed solder legs or leads.
• 6) Do not mix new and used batteries, or batteries from different sources.
• 7) It is strictly prohibited to short circuit between positive and negative and reverse connection between positive and negative electrodes.
• 8) Do not disassemble or dissect the battery.

DIY battery pack must get the cells balanced (same voltage) before assembly. Later if there happens don't know how to assembled or wrong assembly is not accepted refund.

Professionals will detected voltage/resistance/appearance and other issues before every shipment, we can only ensure that the single battery is good, when arrival you can test the cells within 15 days, after that means batteries have no problem, does not provide return nor refund. If you found problems you can return or refund.

Battery can only be unused (the electrode intact, no welding, no wear, the appearance good) to provide return. Any return behavior buyers need to be responsible for shipping fee.