Battery Lithium 3.7v 1800 mah 6.66wh Polymer(3pcs)Rechargeable | eBay
Amazon.com: WMYCONGCONG 4 Pack 8 x 1.5V AA Battery Holder with Snap Connector and Hard Plastic Housing T Type Wire (8AA) : Electronics
Amazon.com: HXJNLDC DC 3.7V 800mAh 603040 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Mobile Energy Storage Power Supply : Health & Household