$3-5

Lithium-ion 18650 battery:

1800mAh, 2000mAh, 2200mAh, 2400mAh, 2600mAh

$20-30

NiMH 14.4V irobot battery
400series
500series
5900series

$3-3.5

Alkaline batteries:

1. carbon zinc batteries
2. 6V 25Ah
3. Super power batteries

$10-15

Li-ion rechargeable batteries, because of its higher voltage per cell and higher energy density, are becoming increaseing popular for making power packs for applications where....