i need to connect to batteries, 2200mAh 25c, 1800mAh 25c to a sinle microcontroller
so i dont know how to do it.
so help me out of it.
Thank you.

Hi,

Are these same voltage batteries? Plus, can your micro-controller can take that much voltage safely?

Thanks.

What is your purpose of using these 2 lipos together ? Are these single cell lipos?
Are you trying to connect these batteries together, so that you get more Ah rating? If so, you should connect them in parallel . but before doing so, you should make sure both the lipos are same cell configuration.
Which microcontroller you are using?

There are three main DC voltage sources available to supply power for our microcontroller projects: Batteries, wall adapters or the USB port of a computer. Generally, the power level requirement is dictated by the requirements of the devices that you use to build the circuit. These devices consist of the actual microcontroller and any peripheral hardware connected to it in some way. Peripherals may be sensors or other integrated circuit devices (ICs).https://www.robomart.com/buy-8051-controller-development-board-price-india