Builder’s Notes

I Made a Battery Power Station Out of a Broken Chinese Scooter

Video published 2026-09-17

A while back I had two Chinese scooters. One ran fine. The other one didn't, and after I tried fixing it and melted some wires, it was officially junk. The controller was burnt and melted, but the 36V battery was still sitting there in the box, and I didn't want to just toss it. So I turned it into a battery power station.

The plan was simple: take the 36V pack, step it down to 12V, add a breaker for protection, a battery monitor so I can see what's left, and a four-port 12V USB outlet. Then prove it works by running real stuff off it, like a tire inflator and my phone. Something I can use on trips, during outages, and when we go camping.

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What You’ll Need

Parts from Amazon

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Other parts and supplies

  • A 36V battery pack out of a dead Chinese scooter (mine has a BMS inside)
  • The scooter's power button and charging port, plus the 2 amp charger it came with
  • A toolbox to use as the case
  • 10 to 12 gauge watertight heat shrink butt connectors (mine came from Harbor Freight)
  • Hot glue, paper and tape for a hole template, and tape to keep the battery case closed

Tools Used

  • Allen wrench (the breaker didn't come with one)
  • Pliers (for crimping the butt connector, a good "death grip")
  • Something sharp to mark circles on the toolbox (I used the end of a screw), then cut the holes out
  • Hot glue to hold the converter and breaker in place

How It Went Together

Unboxing and a sanity check with Grok

First thing was opening the Amazon boxes to make sure everything actually showed up: the four-port 12V USB outlet, the 36V to 12V step-down converter, the 15A breaker, the XT60 connector set, and the battery monitor. These are all pretty much Chinese parts, so don't expect fancy packaging. The breaker even came with a couple of heat shrink pieces.

I'm not an electrician, so I leaned on Grok while planning this. I asked it if my pile of parts plus the 36V scooter battery would work as an energy bank. Its answer: the scooter battery is the power source, the step-down brings it to 12V for the USB outlet, the 15A breaker protects the circuit, the XT60s handle the hookups, and the monitor tracks the battery level. It also said to make sure the wiring is solid and the breaker sits between the battery and the converter. Grok also told me I wanted a pack with a battery management system (BMS).

Checking the scooter battery

I split the battery case open to see if there was a BMS inside, and there is. I taped it back up just so it stays dry for now. The box also had a power button and a charging port that hook up to the pack, and the 2 amp charger. That's how I'm charging it.

Proof of concept first

Before building anything into a case, I wired it all up loose on the bench to make sure it worked. I used Grok a lot to figure out the wiring. Then I ran a tire inflator that has a light on it, no problem, and charged my cell phone really fast off the USB outlet. That told me the idea works, so then I worried about packaging.

Making the case

I picked a toolbox as the housing. It needed four openings: one for the USB sockets, one for the monitor, one for the charger plug, and one for the on/off button. To get the dimensions, I taped four pieces of paper together around the inside of the box to make a template. I marked the circles with the end of a screw and cut the holes out off camera. The monitor goes in the front, the DC outputs on the side, and the charger and power button on the back.

Wiring it up (unplugged, for safety)

I finished the wiring with the battery disconnected. The XT60 connectors are basically the battery's positive and negative terminals in plug form, like a car battery with two exposed posts. They only go in one way because of the shape, so red is positive and black is negative.

First thing I learned: right off the battery's positive, you put a breaker or a fuse. I went with a breaker. If I trip it, I know whatever I'm running pulls too much for my 15A, I just don't use that again, and I can flip it back on without putting a new fuse in every time. I slid the wire in, tightened it with the Allen wrench, put the cap over it, and did a pull test.

Next is the battery monitor, which you want close to the battery on both the positive and negative side so it gets the best reading of the 36 volts. That's what was explained to me. The step-down converter came with its own fuse, a 20A. I left it in place. The 15A breaker would trip way before it did.

The monitor has two positives, which is for hooking up a relay or switch. I already have a power button, so I didn't need that. Without a switch, you just join the two positives together. After 30 minutes of figuring it out, I joined the monitor's positives and the converter's positive, and they go straight into the breaker. I double checked with Grok. Pro tip: sometimes you've got to dumb things down for the AI.

The negatives work the same way. The monitor's negative and the converter's negative go together, so I joined them with one of the heat shrink butt connectors, checked the connection, and hit the other side with pliers. That finished the power side of the converter.

The outlet side

The output of the converter has a yellow wire for positive and a black wire for negative. The USB outlet came with a positive and negative lead with a branch off of it for the other set of ports. Positive is on the left side and negative on the right. I plugged those in, then matched red to yellow and black to black using the connector that came with the converter. Throw it in with the latch at 90 degrees, close it down, and it's stuck. So basically: power side on the left, outlets on the right.

Into the box

With everything working, I put it in the toolbox. The converter and the breaker are hot glued in place. The monitor, the plugs, the charger port and the on/off button all went into their holes. I hit the power button and the monitor lit up, and the outlets have a blue backlight. I plugged in the air compressor and it came right on. The USB panel even has its own little power button.

The real test: tires

I took the inflator to my motorcycle. The book says 30 PSI, and the first tire I checked was right at 30 PSI. I checked the other one too, and it was a little under 10 PSI, so I had about 20 to push. I've charged my phone a bunch of times too, and I hadn't recharged the battery yet when I filmed this, so I'm still seeing how it holds up. Then I hopped on the motorcycle and went for a ride.

Safety Note

  • Heads up: I'm not an electrician or a professional, and this is not professional advice. This is just what I did and what I learned. If you're not comfortable working with batteries and wiring, get help from someone who is.
  • Take lithium battery care seriously. Scooter packs are often lithium, so if yours is, treat it that way: make sure it has a BMS, keep it dry, don't leave a damaged pack sitting around, and don't short the terminals.
  • Put a fuse or breaker right off the battery's positive, and size it so it protects your wiring.
  • Wire it up with the battery disconnected, check your polarity (red positive, black negative) before you connect anything, and do a pull test on every connection.
  • Double check your own setup, and don't just take an AI's word on everything.

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