This 3.7v Lithium Ion battery is a very slim, extremely lightweight battery based on the new polymer lithium-ion chemistry. This is the highest energy-density battery currently in production. Each cell outputs a nominal 3.7v. These batteries require special charging. Do not attempt to charge these with anything but a specialized Lithium Ion battery charger.

This Li ion Battery includes built-in protection against over voltage, over current, and minimum voltage. Please use caution when using this battery in wearable projects. When using conductive thread, a short in the thread can create sparks and heat.

Read our blog Li po vs Li ion battery where we explained what Lithium-ion and lithium-polymer batteries are subject to specification, advantages, and disadvantages