3000mAh NiMH Rechargeable Battery POWO18B, 3.7V Large Capacity Batteries with Case, Perfect for Flashlight, Camera, Small Fan, Doorbell, Toys, Headlamp, and Other Battery Operated (4pack, Red): Amazon.co.uk: DIY & Tools
18650 Lithium-ion Rechargeable Cell - 3000mAh 3.7V 15A | The Pi Hut
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
RS PRO 3.7V Lithium-Ion Rechargeable Battery Pack, 7.8Ah - Pack of 1 | RS
LI-ION 2000 MAH 3.7V 18650 Rechargeable Battery - Batteries - Lamps & Lights - Home & Lighting