3.7 Volt Rechargeable Battery, REACELL 3000mAh Rechargeable Battery, Button Top NiMH Battery High Power Long Lasting for Headlamp, LED Flashlight, Solar Light, Electronic Devices etc (4 Pack+Box): Amazon.co.uk: DIY & Tools
Qura Power 3.7V 3000Mah Rechargeable Li-Ion Battery, Battery Type: Lithium-Ion, Model Name/Number: