Questions tagged [battery]

Questions about battery powered LEGO systems, models and its elements.

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Type of Battery connector of Spike Prime & essential Hub

What is the type of the 3-pin connector used to connect the Spike Prime Hub or Spike Essential Hub to the rechargeable battery? It consists of 3 pins and has a male and a female side. I have issues in ...
sschotte's user avatar
4 votes
2 answers
207 views

Steam train 10874 draining batteries in seconds

Santa brought my son a new Steam train 10874. We assembled it and put brand new 4xAAA (1.5V) batteries. The train works for 4-5 seconds and then stops. Connected it to the app and it shows batteries ...
jamall's user avatar
  • 43
1 vote
0 answers
104 views

LEGO Express 60197 displays low battery

Using new batteries to power the controller - however on connecting the app using Bluetooth the status immediately shows low battery. Uninstalled the app and reinstalled it with new set of batteries, ...
Seattle's user avatar
  • 11
0 votes
2 answers
124 views

What is the carbon footprint of running a Spike Prime robot? [closed]

We are trying to calculate how much carbon is emitted from running a Spike Prime robot off one charge (roughly 8-10 hours)?
Laura's user avatar
  • 9
5 votes
1 answer
141 views

4.5v/12v connector contact problems

I have pulled out several 1970s and 1980s 4.5v and 12v motors/trains from my childhood for my children to play with. Everything is working pretty well, except that we have recurring contact problems ...
Michael Isard's user avatar
4 votes
1 answer
118 views

Transformer 45517: power supply or charger?

I would like to build a charging station for EV3 with rechargeable battery (45501). Does the transformer (45517) give a simple stable dc voltage (power supply)? Or does it provide a controlled voltage ...
Jean's user avatar
  • 41
0 votes
0 answers
369 views

How to increase the voltage supplying to technic motor through the Technic hub?

I have four Technic Large Motors, all connected to a technic hub. I am using the motor to turn some large propellers and the hub is powered by six 1.5 V (maybe less) batteries depending on the brand. ...
user39178's user avatar
  • 217
2 votes
2 answers
216 views

Is it possible to power supply an EV3 hub through the battery slot with 10 V?

I have two USB power banks that according to USB standard supply 5 V. I want to power my EV3 brick using my two USB power banks wired in series and to the EV3 battery slot. Can I power supply an EV3 ...
amreo's user avatar
  • 159
4 votes
1 answer
244 views

Battery Box 8881 not providing enough power

I bought a used 8881 battery box. It doesn't appear to work with anything. When I test it with a multimeter, I only get a voltage reading of ~0.5V. I tested each of the batteries, they each come out ~...
OliverRadini's user avatar
2 votes
2 answers
432 views

How can I open part #53500 and replace the battery?

I've searched and can't find any info on it on how to open this LEGO part 53500 Won't open the same way as other light bricks, and don't see any clips or a continuous line where it should open. Need ...
Razvan Zoitanu's user avatar
8 votes
2 answers
1k views

Options for powering Winter Holiday Train

Is there a way to make the Winter Holiday Train powered without the IR receiver or Remote Control? I only set it up at Christmas time and just want it to go around the track at the one speed. I want ...
KazDok's user avatar
  • 81
5 votes
2 answers
275 views

Are there any existing (or upcoming) aftermarket PoweredUp hubs?

I bought the Mindstorms v4 / advanced hub (in set 51515). It's a good set, and the Hub has some great features - notably a rechargeable battery, the ability to run "live" off of USB power, ...
some bits flipped's user avatar
1 vote
1 answer
613 views

Mindstorms EV3 - Continuous low battery alarm

My son is facing an issue with his Mindstorms EV3. Every time he turns it on a low battery alarm is displayed and it shut downs. This happens regardless of the batteries, we have tried 12 different ...
Atilio's user avatar
  • 11
1 vote
1 answer
132 views

Is the Technic hub putting the battery in series or parallel

Can anyone tell me how the battery in the Technic Hub is connected? Are they connecting the batteries in series or parallel? It is the hub that powers the motors, right? If all 6 AA batteries are ...
user39178's user avatar
  • 217
8 votes
1 answer
2k views

What is the battery life of the new Mindstorms and SPIKE Prime hubs?

The new Mindstorms v4 and SPIKE Prime hubs include a 2100mAh Lithium-ion battery. How long is it expected to last when running a program?
jncraton's user avatar
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7 votes
1 answer
779 views

6 x 14 plate with 2x12 plate molded on top and metal contacts on the bottom identification

Needing help identifying this part as I was offered a small bag of vintage train parts and this come with some very unknown parts to me. I just recently got out of a 33 year old Dark Age and have ...
Henrique de Sousa's user avatar
2 votes
1 answer
924 views

How do I run the LEGO Technic V6 engine using a Lego electric motor?

I am not into LEGO, don't know anything about it, so I will try to be as specific as possible. My goal is to spin the LEGO Technic V6 engine (preferably at some realistic RPM's like thousands). ...
SHC MostWanted's user avatar
12 votes
1 answer
2k views

Replace Battery in LEGO Dino Attack Light-Up T-Rex Head?

Is it possible to replace the battery of the LEGO Dino Attack T-Rex head? There's a button on the top of the head that makes the eyes and tongue light up red, presumably via a red LED. There doesn't ...
Alexander O'Mara's user avatar
7 votes
1 answer
140 views

Can anyone identify this dark grey remote control and receiver with yellow and orange buttons?

Does anybody have an idea where this remote control and receiver are originally from:
JussiL's user avatar
  • 71
0 votes
0 answers
541 views

EV3 low battery communicate right after startup

I just bought an EV3 and started having battery problems. I am using 6 NiMH 1.5V batteries for my EV3. They lasted for around 10 minutes of work and went flat (that's what the EV3 kept saying but the ...
Bednar's user avatar
  • 1
8 votes
1 answer
575 views

Classic 9V battery box current limiter?

Recently I disassembled a classic 4760c01 Electric 9V Battery Box Small Complete Assembly to see what was inside. Battery Box: Disassembled: In the switch component, we find what appears to be a ...
Alexander O'Mara's user avatar
6 votes
2 answers
4k views

9V Battery instead of PF Battery Box

I want to use the PF Light Unit in a small MOC. The battery box contains six 1.5V batteries and is too large. How can I use a regular 9V block battery to power the lights (and possibly other 9V ...
Metalbeard's user avatar
  • 2,615
1 vote
1 answer
748 views

LEGO remote control 8879 for 2016 Winter Train not working

I purchased parts 8879+8884+88000+88002 to power the new Winter Holiday Train. Fresh out of the package the remote controller 8879 does not make contact with the positive end of the battery. Thanks ...
Theresa Wiseman Brezden's user avatar
4 votes
1 answer
597 views

Connecting LEGO WeDo USB hub to portable Power Bank

Is it possible to connect the LEGO usb hub from education WeDo series to a portable power bank for power? WeDo USB Hub Portable Power Bank
user275517's user avatar
3 votes
1 answer
1k views

EV3 with NiMH batteries

Could I use 6 NiMH 1.2V batteries and keep pressed the small black circle in the battery compartment in order to adjust the battery gauge and low battery alarm?
Sebastian Backis's user avatar
6 votes
2 answers
3k views

What are the differences between NiMH and Alkaline batteries for the EV3?

Currently I am using six rechargeable batteries for my Lego Mindstorms EV3. A few seconds after I start a motor the EV3 gives a notification that that the battery is low. I know that good batteries ...
Thomas Vos's user avatar
5 votes
1 answer
925 views

Battery Acid Dust Issue

I was recently digging through some old boxes looking for old LEGO bricks I had as a kid. In two of the boxes I found old double A batteries that had busted (the boxes were in a building that has got ...
Age243's user avatar
  • 51
10 votes
2 answers
3k views

Battery for Trains

For those who have tried, which one is a better option: Rechargeable Battery Box and Transformer/Charger 10VDC ($50 + $25) or AAA Battery Box and a lot of AAA batteries ($13 + ?) Obviously $75 is ...
Farhan's user avatar
  • 389
8 votes
1 answer
3k views

Power Functions battery box and receiver limits

What combination of motor/Receiver/battery boxes are possible/supported? example: 2x XL motors, 1x M Motor, 1 light using 1 receiver and 1 battery box.
user849169's user avatar
8 votes
1 answer
3k views

Can 10153 9V train motor be powered by the Power Functions Battery pack?

I am currently making the switch to Power Functions with my Lego Train collection and am wondering if I can power the old 9v motors that I used with the metal rails, with a battery box from the power ...
Ed Smith's user avatar
8 votes
1 answer
2k views

Adapting charger for NXT 9798 battery

I have an old style 9798 NXT rechargeable battery pack 7.2V 1400MnAh, but no charger. Can I adapt a spare non lego 9v 200mAh charger for this? Or is voltage too high? can anyone read the output ...
Zarnx's user avatar
  • 81
11 votes
1 answer
362 views

How much depth does the NXT battery pack add?

The NXT rechargeable battery pack does not fit flush with the back of the NXT brick like the battery cover (used with 6xAAs) does. I don't have the battery pack (yet), so I was wondering how much ...
retracile's user avatar
  • 1,569
19 votes
2 answers
12k views

Is it possible to change the battery in a 54604 light brick?

I got 4 of these in in a bulk lot of Lego, but the lamp is getting quite dim in a couple of them. Is it possible to change the battery in a 54604 light brick? It looks like the brick should open, ...
Kramii's user avatar
  • 9,121