Built-in protection circuit (PCM) prevents over charging/discharging.
3.7V 450mAh LiPo 1S Polymer Rechargeable Battery: MP3 GPS Speaker - 403040
Radient LiPo 1S 450mAh 3.7V 35C JST
5 PCS 3.7V 450mAh Lipo Polymer Rechargeable Battery 802030 For Bluetooth GPS MP3
3.7V 450mAh Lipo Battery Battery for Wltoys K110 K110s Helicopter XK V977 V930
450mAh Lipo Battery 60C Discharge Rate 7.4V 2S XT30 Plug Power For RC Vehic
2pcs 3.7V 450mAh lipo Li Polymer rechargeable Battery For Watch Headphone 802030