https://alexnld.com/product/10pcs-astrolux-c2150-5000mah-3c-3-7v-21700-li-ion-battery-unprotected-15a-high-performance-rechargeable-lithium-power-cell-for-flashlights-rc-toys-remote-control-gamepad/?hilite="ShockLi 21700 4000mAh Flat Top High Drain 20A 3.7V Li-ion Rechargeable Battery ��� 2PCS Battery Case"