A simple, small, SMD solder kit for a 0.8A USB single cell lithium ion/polymer battery charger.Designed by Ion Forbes in United Kingdom
The circuit will charge a single cell lithium ion/polymer battery with a maximum current of 0.8A. After everything is soldered up, plug in the micro USB cable and the LED will light, indicating tha...Read More…
The circuit will charge a single cell lithium ion/polymer battery with a maximum current of 0.8A. After everything is soldered up, plug in the micro USB cable and the LED will light, indicating that charging has begun. The IC will get quite hot but this is normal. The LED will extinguish once charging is complete. The device you wish to power with the battery can be soldered in parallel to the battery; the charging circuit will provide up to 0.8A of current. Any more current and it will drain from the battery. For example, if a load takes 0.5A while the charger is plugged in, the battery will only charge with 0.3A of current. The charging IC is a BQ21040.
This circuit does not provide short circuit or battery overheat protection. It will, by nature, provide over voltage protection and under voltage protection while charging, unless the battery is being drawn from with a current exceeding 0.8A, in which case it will not be able to keep up and the battery voltage could drop too low.
We recognize our top users by making them a Tindarian. Tindarians have access to secret & unreleased features.
We look for the most active & best members of the Tindie community, and invite them to join. There isn't a selection process or form to fill out. The only way to become a Tindarian is by being a nice & active member of the Tindie community!