# How can I design a light-weight, on-board battery & charging system for a self-charging robot?

My project involves the robot navigating to its charging station, docking, charging, then resuming whatever it was doing. The robot is a hexapod with 18 leg motors, 2 camera motors, and will be operating on an NVidia Jetson Nano (which shouldn't use more than 5W according to the website).

Since there are so many motors, I'm planning on a 5-6S li-po or li-ion. I expect the system to use around 10-30W while operating. I want to keep it compact, but at the same time I don't want to have to manually plug the robot into a balance charger. The charging station design I have in my head consists of 2 metal contacts on either side, which connects to some charging circuit. The charging circuit needs to be able to charge the batteries without powering off the robot.

I've done quite a bit of research to the best of my ability into products that might solve this problem, but I'm afraid I either haven't found anything or haven't been able to understand anything...

I don't want to have to design / fabricate the circuit if I have to, since the bot catching on fire would be many \$, but I am capable and willing.

Do such charging modules exist? How do engineers in the autonomous robotics industry solve this issue?

• engineers build their own charging station and circuits. that is how they solve the issue. I have never seen such generic modules for sale. But there are charging ICs Apr 11 '20 at 19:36
• If your robot catches fire unattended you have bigger problems than a lost robot. consider LiFe. a bit safer Apr 11 '20 at 19:42