Charging your phone (battery bank, USB fan etc.) from your electric wheelchair or scooter

There’s something perverse about running out of mobile battery whilst sitting in a wheelchair or scooter with huge batteries. Various commercial products bridge that gap; the best of which is Cripple Concepts’ charger. These plug into the charging port on an electric wheelchair and provide a turbo USB charging socket.

These products suffer from some limitations however. Many of them (notably NOT Cripple Concepts’) give out too little power to charge a modern mobile phone. Many of them are expensive (CC’s $40 isn’t bad.)

It’s comparitively easy to create your own charger that is more powerful and versatile, and cheaper. You don’t need to know any electronics to do it either – if you can solder a wire onto a pin you can make this. shows how to create such a USB adapter. I found his instructions invaluable (and wouldn’t have been able to make mine without them), but I have concerns about his creation. The first is heat dissipation: if doing similar with a high power charger, sufficient heat may be generated within the USB adapter to cause it to fail. I also think the connection to the adapter may not be robust enough to survive use and abuse. I would prefer a more powerful rapid charger. Also I would prefer a more “universal” product with e.g. 2+ USB sockets (and that also applies to the Cripple Concepts’ one.)

There’s an alternative, clunkier solution:

It’s clunky but cheap, powerful and useful.

The charger doesn’t stop the wheelchair being driven, like plugging the wheelchair in does. It has a negligible effect on the wheelchair batteries. My wheelchair has two 72 amp hour batteries and my mobile battery is 3.3 amp hours. So it can be used pretty much as much as you like without concern.

Parts needed:

1) “Neutrik” / XLR microphone plug.

Any will do. They are about £3 on eBay.

2) Cigarette lighter inline socket.

The cheapest way to get one of these is to buy a cigarette lighter extension and cut off / discard the plug end. However, I have discovered that those sockets aren’t very robust so break quickly. I advise against getting this very common socket:

Try to get one of these less common but more robust sockets:

They are about £4-5 if you shop around.

3) A cigarette lighter USB adapter of your choice. But NB: the adapter must work with 24 volts, not just 12 volts.

I use one that has two Qualcomm Quick Charge 3 USB sockets. This is about £2 delivered on eBay.

Solder the wires from the cigarette lighter socket to pins 1 and 2 of the Neutrik plug, as described on

Strengthen the wire if you want, using heat shrink, hot glue or whatever. I also cable tie it to the wheelchair cable that runs to the control / joystick module, for extra strength and convenience. That way it’s always at hand.

Put the USB adapter in the cigarette lighter socket. That’s it, really, all done.

The only thing I also did however, is to find a way to keep the USB adapter into the socket. Reason being that otherwise it tends to work loose over time, which is frustrating – I’d discover my phone hadn’t been charging when I thought it was. Pushing the charger back into the socket does the trick until next time it works loose.

Over time I’ve discovered the best way is to use a metal bodied USB adapter something like this:

Metal USB cigarette lighter adapter


With a pair of pliers, I simply squeeze the body of this to deform it enough that it bulges and jams into the cigarette lighter socket. This is remarkably robust.

Previously, I drilled a hole through the cigarette lighter socket and the USB adapter (carefully, to avoid damaging its internal circuit board) and put a cable tie through. Otherwise you could glue the adapter into the socket etc. But this is a pfaf.

To use it: plug the Neutrik plug into the charging socket on the wheelchair. The USB sockets are now live and can be used for anything USB. In my case this is charging my phone, my Go Pro camera and/or my battery banks, and running a USB fan (I recommend the “Key Nice” fan below from Amazon) and/or Christmas fairy lights.

To charge the chair, simply unplug the USB charger and plug in the wheelchair charger.

Update 2023

I now recommend using better quality wire and an inline fuse in the charger.

This is because I had An Incident one day. I flipped back the wheelchair arm, as it is designed to do, but the cable from the device somehow got pinched in the arm mechanism. This pinch resulted in a short circuit. The wire suddenly got very hot and the plastic started to smoke.

I unplugged the adapter quick, and my wheelchair and I survived, though the phone charger was toast. And I learnt my lesson. The wheelchair charger socket is effectively directly connected across the two huge batteries, and should a short occur, it is… dramatic.

My chargers now have fuses, and higher quality cables. I use an in-line car fuse holder and 15 amp fuse:

My USB charger plugged into my wheelchair charger port. There's a small black plastic box in the red charging cable.

The wheelchair wiring itself is rated for 12 amps, so any short should hopefully blow the fuse at 15 amps and protect the wiring before that burns out.

The fuse holder is something like this. Trade Direct 2 x Standard Blade Fuse Holder and the fuse is something like this Simply BF819 Alloy Blade Fuse Assortment.

I then use the cigarette lighter socket’s black wire for the other terminal, and solder all together as above.

That way everything is protected for if I trap the wire again – though hopefully I shouldn’t because I’ve tidied the wires up a lot!

Finally, I’ve discovered that right angle Neutrik plugs are more convenient than straight ones.

3 Replies to “Charging your phone (battery bank, USB fan etc.) from your electric wheelchair or scooter”

  1. Doug, some helpful information here, thanks. One question however, I’m rather concerned that a D-I-Y gadget like this could potentionally invalidate any warranty. What are your thoughts ?

    • In theory plugging anything into the charger port, other than the wheelchair charger supplied with the wheelchair, can invalidate the warranty. No difference there from the commercial chargers.
      In reality, this device is very unlikely indeed to damage the wheelchair. If needed it can simply be unplugged and any manufacturer or dealer would have no way to know it had ever been used

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