External Battery for Flashlight

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External Battery for Flashlight

Postby mattwilkinson » Wed Jun 12, 2013 8:11 am

Hi guys,

I got an awesome deal on a fake XM-L T6 Cree Torch.
http://www.ozbargain.com.au/node/103854




I have it mounted but the battery only lasts 1-2 hours.
Instead of switching batteries out. Can you DIY a external battery pack to strap to the frame?

Has anyone done this successfully.
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by BNA » Wed Jun 12, 2013 8:45 am

BNA
 

Re: External Battery for Flashlight

Postby kukamunga » Wed Jun 12, 2013 8:45 am

Yes. I'd consider running a homemade 4 x rechargeable AA battery pack, but it'd probably be a lot cheaper just to buy another torch or battery

Start by getting yourself a Jaycar Electronics catalogue.....
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Re: External Battery for Flashlight

Postby find_bruce » Wed Jun 12, 2013 12:28 pm

It is easy enough to wire up the torch so that it is 1s2p with an additional external battery, but I don't think it is worth the effort. I would advise against using a NiMH based external pack if you are keeping the li-ion internal battery & 4xAAs will give you a shorter run time than 1 x 18650 li-ion due to the current draw.

The number 1 benefit of using a torch is that it is self contained and waterproof, once you start having wires coming out you will be affecting that.

To my mind at least a better option would be to use better batteries, as the ones supplied with that sort of light are usually pretty woeful but in terms of current delivered and in capacity. I would recommend Panasonic or NCR with a capacity of 3100 or 3400 mAh. You will pay more for two batteries than you did for the torch though.
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Re: External Battery for Flashlight

Postby John Lewis » Wed Jun 12, 2013 11:30 pm

I recall way back Pushy came up with a battery box setup.

He had two 18650's in an Eclipse Mint tin. Wood or rubber I think he used and drawing pins inside for contacts. You need to flatten the lip of the tin for the batteries to fit. A piece of dowel with drawing pins inside the torch. You needed a hole drilled in the torch for the wires. 18650's would be in parallel not series of course. You need to do a bit of soldering.

I have one made up for my DealExtreme Ultrafire torch. A friend did similar but uses 4 x 18650. He put them in bits of PVC and fashioned a bottle cage holder.

I'm sure there was a how to do it thread but all I can find are some pictures here.
Hope this helps,

http://bicycles.net.au/forums/viewtopic ... ack#p80586

Read down a few posts for more details.

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Re: External Battery for Flashlight

Postby Pushy » Thu Jun 13, 2013 7:59 am

Here you go but Ive since found some 18650 battey holders on ebay like this or this
Les
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Re: External Battery for Flashlight

Postby John Lewis » Fri Jun 14, 2013 6:47 pm

Thanks Pushy.
Knew I'd seen it.
Might get me a couple of those holders for a project I have. Good find.

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Re: External Battery for Flashlight

Postby yellagonga » Mon Jun 17, 2013 8:55 pm

ofcourse it is possible.

But if you are going to buy a seperate battery anyway, you are not limited to just a torch or even a bike light.

On my mountain bike I have a 8 inch 40Watt 4wd HID LED light bar across the handlebars, 2x15W LED downlight globes under the handle bars, 2x7W LED downlight globes on the helmet and 1 30Watt bike specific HID light on the helmet. Powered by 2 4Amphr 20volt lithium bateries, 1 3amphr 18volt lithium battery and 1 what ever the bike light came with. Totals 114 watts of led light.
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Re: External Battery for Flashlight

Postby Jean » Thu Jun 20, 2013 6:59 pm

yellagonga wrote:ofcourse it is possible.

But if you are going to buy a seperate battery anyway, you are not limited to just a torch or even a bike light.

On my mountain bike I have a 8 inch 40Watt 4wd HID LED light bar across the handlebars, 2x15W LED downlight globes under the handle bars, 2x7W LED downlight globes on the helmet and 1 30Watt bike specific HID light on the helmet. Powered by 2 4Amphr 20volt lithium bateries, 1 3amphr 18volt lithium battery and 1 what ever the bike light came with. Totals 114 watts of led light.


Photos of light output, or it never happened :D
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