Received this video and I'm not sure if it is valid or not. Guess I could disassemble a 6 volt lantern battery and find out. But as I recall from my high school chemistry days, and the warning on the ...

This Design Idea describes a high-intensity, rechargeable flashlight system that you can build from a 6V lantern-type flashlight. The rechargeable battery comprises four 2V, 2.5-Ahr (ampere-hour) SLA ...