Weltool UB21-50 21700 3.6v Li-ion 5000mah USB-C Rechargeable Li-on Battery

Handling Precaution and Prohibitions of Lithium Ion & Lithium Ion Polymer Rechargeable Cells and Batteries Inaccurate handling of lithium ion and lithium ion polymer rechargeable battery may cause leakage, heat, smoke, an explosion, or fire. This could cause deterioration of performance or failure. Please be sure to follow instructions carefully. 1.1 Storage Store the battery at low temperature (below 20 is recommended), low humidity, no dust and no corrosive gas atmosphere. 1.2 Safety precaution and prohibitions To assure product safety, describe the following precautions in the instruction manual of the application. [ Danger!] Electrical misusage Use dedicated charger. Use or charge the battery only in the dedicated application. Don't charge the battery by an electric outlet directly or a cigarette lighter charger. Don't charge the battery reversely. Environmental misusage Don't leave the battery near the fire or a heated source. Don't throw the battery into the fire. Don't leave, charge or use the battery in a car or similar place where inside of temperature may be over 60 . Don't immerse, throw, wet the battery in water / seawater. others Don't fold the battery cased with laminated film such as pouch and Polymer. Don't store the battery in a pocket or a bag together with metallic objects such as keys, necklaces, hairpins, coins, or screws. Don't short circuit (+) and (-) terminals with metallic object intentionally. Don't pierce the battery with a sharp object such as a needle, screw drivers. Don't heat partial area of the battery with heated objects such as soldering iron. Don't hit with heavy objects such as a hammer, weight.