About this item ★AEC643333 rechargeable lithium ion polymer y, nominal voltage 3.7V, full charge voltage 4.2V, capacity 580mAh, power 2.15Wh, size 6×30×30mm(0.236×1.18×1.18inch）(T*W*L), Weight:11.5g(0.406oz)，Maximum current:0.58A。 It can prevent overcharge, overdischarge, overcurrent, and short circuit. ★Compatible with Beats studio 2、studio 3、Solo pro headphones y replacement.It can also be used in other 3.7-5V electronic products with power less than 2.15Wh (580mAh). ★Please carefully compare the polarity of the connector before use,the red wire is the positive "+"、 and the black wire is the negative "-"、The yellow line is NTC，Do not reverse-charge or reverse-connectreverse. The primary y 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. ★It‘s consists of of large-capacity A+ lithium y, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-30 high temperature resistant silicone cable, and genuine JST Pitch08mm 3-pin connector module. ★If there is any quality problem within one year, please contact us by email at any time and replace it free of charge.