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Li-On Battery Charging (and Discharging)

A project log for PIP-Watch

Pip-Watch (Personal Information Panel) is an open-source smart watch with an ePaper display, a bluetooth modem, and a Li-Ion accumulator.

JaraJara 06/11/2014 at 20:180 Comments

In my PIP-Watch project I will use a Li-On battery to provide power. Li-On batteries are easy to use in hobby projects: they are light, small, with high capacity, and they come in variety of sizes. Most (not all) Li-On batteries have nominal voltage 3.7V, hence you can directly power your standard 3.3V digital logic directly, using only a simple low-drop linear regulator (e.g. LD59015).

For my first experiments I chose Nokia BL-4C Li-On battery. It’s nominal voltage is 3.7V, charging (maximal) voltage is 4.2V, the capacity is 860mAh.

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