powering my new project with lithium cell

Thread Starter


Joined Apr 7, 2017

I am in the process of designing and building a portable metronome.

I would like to power it with a 3.7v 1000mAh li battery.

I have a couple of practical problems with this.

firstly how do I attach the cell to my circuit?

and secondly how do I attach my charger?



Audioguru again

Joined Oct 21, 2019
Lithium batteries are sold in hobby stores for models. They are Li-PO and come with a connector. Your project can use the same connector (it can come with attached wires) they sell that is on the chargers they sell.



Joined May 13, 2020
I've done a number of projects each using a 18650 battery. You can use the cheap and easy to get TP4056 module which has battery protection and a USB power in for charging. For 1000mah you will need to change a resistor to adjust the charging current. plenty of youtube videos on this.

Audioguru again

Joined Oct 21, 2019
The Lithium battery charger circuit is supposed to sense that the charging current gets low then it shuts off.
But if the battery is powering a load and the charger cannot sense low current then it might over-charge the battery which is dangerous (fire and/or explosion).