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Zeasun 3.7V 14500 Rechargeable Batteries Deliver Improved Smart Overheating Protection and Other Safety Features,To prolong The Battery's Lifespan and Keep It at Maximum Performance Over Time. Specifications: Battery Name: 14500 Battery Battery Type: Li-ion Voltage: 3.7V (Limit Voltage:2.75-4.2V) Capacity: 750mAh Rechargeable Time: About 3 hours Discharge Temperature Range:-10°C-60°C Charge Temperature Range: 0°C-40°C Storage: 1 Year:-20°C-25°C; 3 Months:-20°C-45°C; 1 Month:-20°C-60°C Battery Size: 14x50mm/0.55x1.97in (Body Diameter x Length) Each Battery Weight:25g/0.88oz Package Include: 10 xZeasun 14500 Lithium ion Battery 2 xZeasun 14500 Batteries Storage Case Warning: ⚠Never insert a battery with the positive and negative poles reversed as this can cause permanent damage to the battery which may swell or rupture. ⚠Do not use a battery in an appliance or purpose for which it was not intended.Differences in specifications can damage the battery or appliance. ⚠Never reverse charge or overcharge with high currents (i.e. higher than rated).Doing so causes rapid gas generation and increased gas pressure, thus causing batteries to swell or rupture. ⚠Avoid using old and new batteries together. Also avoid mixing batteries using differing cell chemistries such as ordinary dry-cell batteries, Ni-Cd, NiMH batteries or with another manufacturer's batteries. Differences in various characteristic values, etc., can cause damage to the batteries or the product. Attention: 14500 Battery and AA Battery Has The Same Size,But The Voltage Is Different,14500 Batteries Is 3.7V and The AA Is 1.5V,Please Make Sure Your Device's Voltage.