Skip to main content

NXT rechargeable battery and charger

For my first post I was going to put up photos of the inside of my NXT brick. Just two minor things stopped me:

1. I only have a picture of the top side of the circuit board, as I have not yet persuaded the battery terminals to become disconnected. (I guess I need a bigger bit for my soldering iron, and some extra hands to help pull when the solder is melted.)

2. J├╝rgen Stuber has just beaten me to it -

That I have disassembled my NXT so quickly will tell you something about me, for good or ill. In mitigation I must point out that the software arrived a day later than the hardware, and the temptation was great.

I shell visit the NXT internals later, but for now here is some info I have not seen covered elsewhere...

This is the rechargeable battery in the NXT Educational kit:

Notice the light grey half width studless beam balanced on the lip of the battery; illustrating that the battery protrudes the whole height of the beam from the back of the NXT brick.
The battery can be recharged whilst installed in the NXT, unless it is completely discharged.
The green LED illuminates when the transformer is connected, and the red LED whilst the battery is charging.

The postive and negative terminals of the battery pack are at the bottom corners of this second picture.
Just inside these you can see two silver dots - some of the blind rivets keeping the housing sealed.
To the top, just before the clip that holds the battery pack inside the NXT, is a plastic pin that operates a button inside the NXT. Presumably the switch simply indicates that a rechargeable battery is fitted - perhaps in order to limit the power level to the motors?

This is the UK charger, notice the only identification or label on the charger brick is on the side facing the wall. It does not even mention Lego, but has safety test symbols and describes the output as 10V ac 7VA.
There is a Lego sticker on the wire, but that seems likely to be lost quite quickly in a classroom.
The other side of the sticker has symbols warning against connection to mobile phones, tape players and radios.
The printed instructions very strongly say not to use a non-Lego charger.


Popular posts from this blog

Celebrating MINDSTORMS with a Remix - Part 2

The ROBOTMAK3RS continued their celebration of the 25th Anniversary of MINDSTORMS through these summer and fall remix projects. Each ROBOTMAK3R was tasked with selecting one LEGO set of their choice and combining it with a MINDSTORMS set. Below are the five amazing models they came up with. Remote controlled material handle r by Jozua van Ravenhorst (aka Mr Jo) This remix combines the LEGO Technic Material Handler (42144) with MINDSTORMS EV3 (31313) It uses the power of pneumatic cylinders to move objects around. By using a bluetooth remote control, very precise movements can be made with this model. Touch sensors in the base chassis prevent the turret twisting the cables that go through the turntable to much. The program has several protections to prevent over pressurizing the system for each of the 3 individual pumps and valves that control the 2 booms and claws. The real version of this machine is mostly used in waste material sites to bring the material to machines that sort and


2023 is the 25th Anniversary of the MINDSTORMS brand. For 25 years, MINDSTORMS has educated and inspired a generation of robot builders, both children and adults. Unfortunately, the LEGO Group decided to end the line on December 2022. Many ROBOTMAK3RS have been passionately involved with the development of MINDSTORMS through the MUP and MCP programs. Even with the newest Robot Inventor line, several ROBOTMAK3RS were invited to submit additional bonus models that were included in the official app. Regardless of the retirement of a major LEGO robotics product line, ROBOTMAK3RS continue to MAKE-SHARE-INSPIRE using all LEGO robotics platforms available to us. Here is the official statement from LEGO. Since its launch in September 1998, LEGO MINDSTORMS has been one of the core ‘Build & Code’ experiences in the company’s portfolio, carrying with it significant brand equity and becoming a stand-out experience for the early days of consumer robotics and leading to current Build & Code

Celebrating 25 Years of MINDSTORMS

In celebration of the 25th Anniversary of MINDSTORMS, we take a trip through history. Please also visit ROBOTMAK3RS Community every week as we highlight different projects all through 2023 in celebration of the anniversary. Some of the early history is based on the content shared by  Coder Shah  in our  MINDSTORMS EV3 Community Group . Some of the text and links may have been edited from his original posts for consistency and clarity.  1984 - Kjeld Kirk Kristiansen watched a TV program called "Talking Turtle," where MIT professor Seymour Papert demonstrated how children could control robot "turtles" using LOGO, a programming language he developed. 1988 - The collaboration between MIT and LEGO resulted in LEGO TC Logo in 1988, which allowed students to control LEGO models using computer commands. The video shows Papert demonstrating TC Logo. 1990 - LEGO TC Logo was hampered since the robots you built had to be tethered to a personal computer. LEGO and MIT