Repair of broken Nao robot battery pack

The battery pack for our Aldebaran / SoftBank Robotics Nao V6 robot broke and we are currently not able to find a reseller that ships to our country. Even contacting SoftBank Robotics directly did not result in any response. The official specifications are available here. Since the battery pack was clearly broken we decided to open it up to be able to find a replacement battery ourselves.

Opening the casing is difficult, since it is not only kept in place with latches, but is also glued together. We used a soldering iron at the seams to open open the case.

The battery back seems to consist of six Sony US18650NC1 2900mAh batteries. They are connected with seven wires to a PCB board. The power supply connects with two cables to the PCB board. In addition, the case has two contacts next the charger plug that could be used for detecting if the battery cover is closed. Five contacts connect the battery pack to the robot of which the first two bigger ones seem to carry the power. The four smaller contacts are probably to communicate with between the robot and the battery PCB board.

We ordered some new batteries and will keep you updated on the developments.

13 thoughts on “Repair of broken Nao robot battery pack”

  1. Hello, I teach at an High school and we are facing same issue. Please let me know if your fix will work. Thank you.

  2. Our battery pack died from lack of use. Replacements online range from $290~$490. Our NAO is a V5, the cells in the pack are grey; CGR18650CH. We’ve ordered 6 with solder tabs.

  3. Hi, is there any update on how it went. I’m curious if I should try to do the same. Anyone been successful?

  4. Hello. Can Nao be use without battery, just on sector ? (if battery is HS)

    My NAO shut down after boot…he say “gniark gniark” and shut down…

    Anyone repair a battery?

  5. Hi. After reading the comment that the batteries were Sony US18650NC1 2900mAh batteries, we ordered 6 from a UK supplier (£8.99 each). The original batteries were connected in series with flat plates which were spot welded to the cells. We soldered the new batteries together with wire as flat as we could and reconnected the wires that monitor each cell, but it was still a squeeze to get them back in the original case and then back into the Nao. Having done that, our Nao is back in action and working fine.

  6. Hi all, We have the same issue, and I found there are some suppliers on eBay and the price is about 450 pounds. Is that reliable or do I have to order some batteries and fix them by myself?

  7. Getting original new batteries would likely to be the best solution, if you can afford it. I found some web shops that listed these batteries, but they did not ship to New Zealand or they would just cancel my order.

  8. We planned to do a school project with nao but the battery is broken so our robot is a paperweight now. There are no web shops at all that ship to the netherlands. Pretty wierd that such an expensive robot has this lack of support.

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