Lithium Ion Cylindrical Battery 3.7V - 18650 Cell (2600mAh) Unprotected
3.7V 4.4Ah lithium battery
Buy MAENT® 3.7V 1000 mah Actual capcity lipo Li ion Rechargeable Battery Lithium ion Polymer Cell for Bluetooth Science Project Toys MP3 GPS PSP Handheld Device - NOT for RC CAR OR
Amazon.com: Adafruit 328 Battery, Lithium Ion Polymer, 3.7V, 2500mAh, 2" x 2.55" x 0.30" Size