14
votes
Accepted
What is the battery life of the new Mindstorms and SPIKE Prime hubs?
Power consumption and battery life will of course vary based on the load that the hub is driving. Philo has an extensive analysis for motor power consumption, so I'll just look at what the hub itself ...
- 41.8k
12
votes
Accepted
6 x 14 plate with 2x12 plate molded on top and metal contacts on the bottom identification
Part# BB0054 - Electric, Train 4.5V Battery Car Roof.
(But Light Gray in color.)
- 8,913
10
votes
Options for powering Winter Holiday Train
If you want to “turn on and forget” you might want to look into obtaining a circle of old 9V track (metal rails produced by LEGO until 2007) and a power supply, plus a 9V train motor. It will not be ...
- 17k
9
votes
Accepted
9V Battery instead of PF Battery Box
Most Power Functions pieces will run in classic 9V mode. The IR receiver can't, but motors and lights can.
A hacky solution:
Many people have done this by cutting up an extension wire, and ...
- 13.3k
8
votes
Accepted
Steam train 10874 draining batteries in seconds
Since this is entirely new set, getting in touch with LEGO Customer Support will be your best way of addressing this issue. They will be more than happy to help you.
- 23.4k
8
votes
Accepted
Classic 9V battery box current limiter?
The short answer is about 150mA.
Electrical Characteristics
From the limited testing that I've done, the component you pointed out appears to be a positive temperature coefficient thermistor. Here's ...
- 41.8k
6
votes
Options for powering Winter Holiday Train
Yes, the rechargeable battery box would work.
However, if your intention is to avoid expenses, you are better off with buying the IR-receiver, IR remote and the regular battery box rather than the ...
- 11.1k
6
votes
Accepted
How can I open part #53500 and replace the battery?
I found this Youtube video
Piraka eye replacement
and this article on bzpower.com
How to Replace the Battery in Piraka Eyes
The battery used is a CR927 3V Lithium Battery placed + side up.
First, ...
- 13k
5
votes
Accepted
Battery Box 8881 not providing enough power
In case anyone else has this issue - cleaning corrosion off of the connections solved the problem!
To clean the contacts, I used white vinegar applied with a cotton-swab/cue-tip. I dried it off with a ...
- 201
5
votes
Mindstorms EV3 - Continuous low battery alarm
Update: we made it work, after trying many things, see below.
Opened the brick and inspected it for obvious signs of problems but saw nothing. Even tried with the screen disconnected.
We tried, as ...
- 151
4
votes
What is the carbon footprint of running a Spike Prime robot?
None, running the robot doesn't produce any carbon as it doesn't run on fossil fuels but consumes electrical energy.
Producing the electrical energy to charge the battery does have a carbon footprint, ...
- 11.1k
4
votes
Transformer 45517: power supply or charger?
The charging circuit is in the battery, so any 10V, 700mA DC power supply should work. The circuit driven by a MP26123 chip.
The battery schematic is available from the EV3 Hardware Developer Kit on ...
- 9,778
4
votes
Accepted
Is the Technic hub putting the battery in series or parallel
The batteries are in series. Which gives (in theory) 6x 1.5 = 9V.
Actually it is a little less than 9V as batteries drop voltage a little when they are used.
They can drop as low as 1.2 V when they ...
- 1,366
4
votes
Is it possible to power supply an EV3 hub through the battery slot with 10 V?
Yes. The EV3 technically only needs 5V to run. And just the EV3 by itself pulls around 200mA at that voltage. However, motors could be a problem. They can pull up to 1A when stalled, which could ...
- 9,778
3
votes
Accepted
Are there any existing (or upcoming) aftermarket PoweredUp hubs?
BuWizz has announced the BuWizz 3.0 Pro which has Powered Up compatible ports.
The product page says:
Expected Delivery: End of March 2021
- 9,778
3
votes
Accepted
Replace Battery in LEGO Dino Attack Light-Up T-Rex Head?
Unfortunately after attacking this piece from every angle with some plastic opening tools, I'm quite certain there is no non-destructive way to open this piece.
I tried slipping a spudger in every ...
- 13.3k
3
votes
Can anyone identify this dark grey remote control and receiver with yellow and orange buttons?
Bionicle manas set 8539.
Top part from your foto. Bottom one.
- 271
2
votes
9V Battery instead of PF Battery Box
Check out Philo's pages for details on Power Functions: http://www.philohome.com/pf/pf.htm
Basically, a Powerfunctions cable consists of 4 wires: 9V, C1, C2 and GND. C1 and C2 are also 9V/GND, but ...
- 17k
2
votes
Accepted
LEGO remote control 8879 for 2016 Winter Train not working
I had the same problem, so I looked at the forums, but I couldn't solve it.
In fact it is a problem with the contact, so I put some aluminium foil (the same one from the kitchen) in the positive ...
- 36
2
votes
Are there any existing (or upcoming) aftermarket PoweredUp hubs?
Raspberry Pi produce the "Build HAT" which is an interface board for the Raspberry Pi and it works with Powered Up sensors and motors.
- 673
2
votes
Accepted
Is it possible to power supply an EV3 hub through the battery slot with 10 V?
Don't ever put power-banks in series or paralel !!! They are not plain batteries.
Unless you are an electrical engineer that understands the exact circuitry inside the power-banks this is in general ...
- 1,366
2
votes
Accepted
4.5v/12v connector contact problems
At least with 1980s grey cables, the pins on the plugs are split, and if the four segments of the pin get pushed together the connection becomes loose. Gently easing the segments apart with the tip of ...
- 433
1
vote
Steam train 10874 draining batteries in seconds
Draining batteries in five seconds should be impossible. The batteries would go up in flames.
What’s possible is that you bought fake batteries that have practically no charge. Or you picked batteries ...
- 129
1
vote
What is the carbon footprint of running a Spike Prime robot?
The official rechargeable battery for the large hub has 2100mAh capacity at 7.3V - This lets you calculate the total watt-hours in one full charge (let us know if you need help with this), which you'...
- 17.3k
1
vote
How can I open part #53500 and replace the battery?
Found the instructions for set 8905 that uses this part. Problem solved: "battery is not replaceable". Disappointed !
- 183
1
vote
Accepted
How do I run the LEGO Technic V6 engine using a Lego electric motor?
Assuming that your motor already has a Technic axle available, you'll need:
Any Technic motor. You probably want an M motor (8883).
An appropriate battery box or other power source. If you selected ...
- 41.8k
Only top scored, non community-wiki answers of a minimum length are eligible