DC 3.7V 550mAh 902030 Rechargeable Lithium Polymer Battery Suitable for replacing built-in 2-wire batteries in 3.7-5V electronic devices and LED lights

This battery is suitable for replacing built-in 3.7-5V batteries with 2 wires and a capacity less than 2.035Wh 550mAh in 3.7-5V electronic devices ( Not suitable for high-power electric tools and model aircraft). Please note that connector specifications and polarity are based on the product display image. The red wire is the positive terminal “+”, and the black wire is the negative terminal “-”. Do not reverse the connection! Some products' original batteries may lack plugs, have incompatible plugs, or exhibit mismatched polarity. No worries—you can simply cut the wires and use the included heat-shrink tubing to connect the wires of the same color from the old plug. 902030 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 550mAh, power 2.035Wh, size 31×30×9mm(1.2×0.787×0.354inch）(L*W*T), Weight:11g(0.4oz)，Maximum current:0.5A。 It can prevent overcharge, overdischarge, overcurrent, and short circuit. It‘s consists of of large-capacity A+ lithium battery, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-26 high temperature resistant silicone cable, and genuine JST Pitch 1.25mm 2 wire connector module. If any quality issues arise within one year, please feel free to contact us sellers for a replacement.