Nitecore 18650 3.7 V, 2600 mAh Lithium-ion Protected Battery (NL1826) – Torch Direct Limited
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
Rechargeable lithium-ion 18650 3.7-V 2200 mAh battery - Manutan.co.uk
18650 Lithium-ion Rechargeable Cell - 3000mAh 3.7V 15A | The Pi Hut
Vapcell 14650 1100mAh 3.7V Battery
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