DC 3.7V 4200mah 606090 Rechargeable Lithium Polymer Battery, Suitable for DIY 3.7-5V Electronic Products with Built-in 2-Wire Battery Replacement and LED Lights

This battery is suitable for DIY electronic products with 3.7-5V and less than 15.54Wh 4200mAh built-in 2-wire battery replacement.（ Not applicable to high-power electric tools and model aircraft） 606090 rechargeable lithium ion polymer battery, nominal voltage 3.7V, full charge voltage 4.2V, capacity 4200mAh, power 15.54Wh, size 3.543 x 2.362 x 0.236inch(91×60×6mm) (L*W*T), Weight:2.963oz(84g)，Maximum current:4A。 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, 3302-24 high temperature resistant silicone cable Please note that the specifications and polarity of the connector are based on the product display image,the red wire is the positive "+" and the black wire is the negative "-"，Do not reverse-charge or reverse-connectreverse. The primary battery of some products has no plug or mismatched plug or mismatched polarity. It doesn't matter, you can cut and solder the plug directly or use our heat shrinkable insulating sleeve to connect the same color wire. If there are any quality issues within a year, please feel free to contact us via email for replacement.