How to Rebuild a Roomba Battery

The batteries for the Roomba vacuuming robot can wear out fast and are difficult to replace. Fortunately, you can rebuild them. This article will guide you in rebuilding a Roomba battery.

Things You'll Need

• Screwdriver
• 2 sub-C 7.2 battery pack (12 batteries total)
• Soldering iron
• Tester

Instructions

Instructions for Rebuilding a Roomba Battery

1. Take the lid off of the battery pack by wedging the screwdriver under each end in turn and prying until it pops off.

2. Unplug the batteries from the pack housing and remove the battery pack. Take off the plastic.

3. Lay the batteries out on a flat surface and look at the way the wires run. Lay out your new batteries alongside the old.

4. Systematically transfer the original terminals, PTC and varistor to the new battery packs and solder in place.

5. Test each cell, to be sure you have no dead batteries, and tape the two C-cell size packs together.

6. Fit the new battery pack into the housing, plug it in and replace the cover.

7. Charge your battery pack for at least two to four hours, then test. Your Roomba should run as good as new.

Tips & Warnings

• An apparent manufacturer’s defect in the Roomba battery has the terminals in the PTC touching. When you rebuild, you can isolate this flaw and correct it.

• Hacking into your Roomba in this manner can void your warranty in a hurry, so don’t do it unless your Roomba is otherwise in perfect working condition.