Dimmer Switches And 3

Wireless Touch Switch Black 3 GANG 1 WAY Remote Light Switch

It is important to realise that you should buy a cordless flood light on ebay or similar for £20, and making the below described flood light will cost probably £40 or £60.

BUT . . . . if you make it you may repair it. All of the bits are stand alone parts that can be purchased if they go wrong. This is especially true of the battery, sealed lead acid batteries that are normally used have a short life span, and in a few months you floodlight may stop working, at which point you possibly can replace the battery easily in your DIY model.

Sturdy, Dependable and very Repairable

DIY Cordless Flood Light – Bits

List of bits required with description of each needed for constructing DIY cordless flood light.

A lithium battery LIfePo4 being the very best bet as it’s light and will last for maybe 500 – 1000 charge cycles. But one of those with built in BMS at 12v will cost £70 (EV Power) and so it rather expensive.

I had a sealed lead acid battery left over from a project and so I used this, it is 22ah capacity which will give the massive flood light 3 hours run time (9 ah used), as you shouldn’t discharge a lead acid battery past 50% regularly.

Basic Wiring

Really choose the battery first based on how long you wish to run you flood light between charges.

For example in the event you wanted your flood light to last the entire working day of 10 hrs, you would want to use a less powerful light say 10w, which might equate to 1A of current, a 22ah lead acid battery run right down to 50% would provide 12 hours of light.


Many will have already got a 12v charger that is used in your car battery, and generally this can be OK to make use of.

If not head to ebay and but a suitable charger a small inexpensive charger will deliver 1.0 – 1.5 amps of charge. So will charge a large battery over night.

Crocodile clips will be clipped directly on terminals, or you can fashion a plug and socket as described below, in order to avoid opening your case every time you charge.


For my plug and socket I purchase a ” male and female kettle lead” I then chopped this in half, and used the tip to attach the charger to the battery, drilling a hole in case to pass the wire through.

An ammo box is good. An ex. military one is cheap enough around £10 on ebay. They are very tough and will last a life time. Be sure that it is big enough for your battery.


A toggle switch of around 3A rating shall be OK, but for size and robustness chances are you’ll prefer to go for a 10A variant.


Rather unglamorous, but something to pack around you battery to stop it shaking around contained in the casing is important. Some stiff foam would be ideal or at a pinch bubble wrap or similar packed around the the battery.

DIY Cordless Flood Light – Tools

– Drill
– Drill Bits
– Soldering Iron & Solder or Wire Crimps

DIY Cordless Flood Light – How its Done

Drill all the entire required to pass the wires to the battery via the switch, solder all of it together. And that’s just about it. It is extremely basic electronics just check your polarity before you connect anything up.


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