Hey, I’m the programmer on my team and I’m using a Vex bot to test code on while the main robot is not complete, but I’m using the regular Robot Controller, which takes a 12 volt battery. As of right now, I am just using a 12 volt power supply, which is very inconvenient because the robot has a cord dragging behind it when I try to drive it and a regular 12 volt battery is much too big/heavy to put on this miniature bot. So my question is are there smaller and lighter 12 volt batteries I can use? Or, is it possible to use a 7.2-9 volt backup battery as the main power source? seeing as how I only have a few vex motors(which are powered via the backup battery anyways), a gyro, and possibly a CMUCam (also powered via backup battery) on the bot.
You can just get a smaller SLA with less capacity, similar to this. Upside is you can charge it with your robot’s charger. If you have an electronics surplus store somewhere near you, they’re almost certain to have something like this in stock.
Unless you have one of the old exide 2A chargers or the 1-year 1A charger, I would be very careful about this. I’m pretty doubtful that any SLA smaller than our robot batteries is rated for a 6A charging current.