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Dry Primary Batteries

There are three major examples of dry primary cell (disposable) batteries; carbon-zinc, alkaline and mercury cells. Primary cell batteries stop operating after one of their chemicals is used up. Unlike a secondary cell, attempting to reverse the reaction in a primary cell via recharging is dangerous and can lead to a battery explosion.

Solar, Windup, Dynamo, and Faraday Powered LED Torches and Gadgets
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3 LED Dynamo-Driven Headlamp / Torch / Flashlight

9.99

Windup/dynamo powered with adjustable head straps, includes compact charging unit (also charges mobile phones), and extension lead, as well adjustable light angle and ecconomy or max-brightness modes.

Three super bright LEDs
Soft-touch button operation
Adjustable lamp angle
One LED (ecconomy) or three LED modes
Comfortable and adjustable tri-band head straps
In-built rechargeable batteries
Separate dynamo charges batteries (built-in with LED charging indicator)
Pull out the handle and turn to charge (two rotations per second)
One minute charge yields up to 15m of light
Charging extension cable
Boxed
Dynamo also charges mobile phones
No-hassle lighting saves a fortune in batteries
Lightweight and ergonomic
Dimensions of headlamp: 60mm x 50mm x 30mm
Due to the brightness of the LEDs this torch is not suitable for young children.
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