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#6574722 - 12/06/16 02:16 PM external battery pack for photon xt
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
I am tired of buying energizer lithium's to run my photon xt. Yes I know I can buy cheaper batteries, but their life isn't as long so it defeats the purpose for me...

Anyway I thought I'd share it with you.

Started thinking about an external battery pack that I could use rechargeables on with extended battery life. I already have a bunch of 18650's laying around for the IR illuminator.

Nothing fancy but working. Going to mount it to a weaver/picatinny adapter so it can connect to the rail on the side of the scope. Haven't gotten that part in yet. Anyway drop it in and powers it just fine. Let it run for over an hours last night. Haven't field tested it yet, hopefully this evening if the pigs show back up.



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#6574848 - 12/06/16 03:44 PM Re: external battery pack for photon xt [Re: bornforit]
deereguy Online   content
Woodsman

Registered: 02/05/15
Posts: 170
Loc: Michigan
How is that working our for you?
_________________________
Happy Hunting
Bob

Disclosure: Pro Staff for Pulsar as of 8-3-2015
Pro Staff Predator Hunter Outdoors

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#6574852 - 12/06/16 03:48 PM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
So far so good. I have had it lazily thrown together for about a month. I just got the case in to make it a permanent housing. I can and will update with some time.

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#6574859 - 12/06/16 03:52 PM Re: external battery pack for photon xt [Re: bornforit]
deereguy Online   content
Woodsman

Registered: 02/05/15
Posts: 170
Loc: Michigan
Awesome...care to share how you make the connection on the cap and what you are using in the battery compartment?
_________________________
Happy Hunting
Bob

Disclosure: Pro Staff for Pulsar as of 8-3-2015
Pro Staff Predator Hunter Outdoors

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#6574887 - 12/06/16 04:12 PM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
Disclosure: Not responsible for any issues...

The black cylinders are simply a dowel rod that was similar size to a double AA. Ran a wire down the side of it connected to a small screw. The small screw acts as the button on the top of a AA. Had heat shrink tubing laying around to keep the wires nice an tidy. Also took up the remainder space to make up for the size difference of the dowel rod. I drilled a hole through the cab big enough to run the wire through. That battery box is from China for next to nothing. Note: I had to rewire the box. It was in Series not in Parallel.

Total it cost me less than $5. Had everything except the box.

All I need to finish is a small adapter so I can connect to the weaver mount on the side of the Photon.

The positive side goes on the same side of the scope as the weaver mount. Just like the regular batteries do...pay attn there as well.

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#6574893 - 12/06/16 04:14 PM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
Im sure I could have made a fancy connection, but I was concerned with the way the cap connects in the center. I didnt want to jeopardize the integrity of the cap closing properly so I just hard wired it in. If I want to undo it I can simply put the stock cap back on and batteries.

I didnt do this to my stock cap. Had an extra. wanted to be clear.

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#6575608 - 12/07/16 06:30 AM Re: external battery pack for photon xt [Re: bornforit]
fr3db3ar Offline
Bird Dog

Registered: 02/08/15
Posts: 347
Loc: Holland, MI
I

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#6576089 - 12/07/16 11:17 AM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
Shot it a couple time last night, worked like a champ.

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#6577419 - 12/08/16 09:30 AM Re: external battery pack for photon xt [Re: bornforit]
Doggk9 Offline
Light Foot

Registered: 12/07/16
Posts: 11
So are the wires run all the way to the bottom and nothing is being done with the top contacts under the cap?

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#6577862 - 12/08/16 02:14 PM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
Dogg - That is correct.

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#6578424 - 12/08/16 09:00 PM Re: external battery pack for photon xt [Re: bornforit]
Doggk9 Offline
Light Foot

Registered: 12/07/16
Posts: 11
What type of run time does it get you?

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#6579632 - 12/09/16 04:33 PM Re: external battery pack for photon xt [Re: bornforit]
bornforit Offline
Bird Dog

Registered: 12/11/06
Posts: 353
Loc: Longview, Tx
Good question,. I haven't tested that, yet.

Things I do know.
I know the numbers on 18650's are generally lies. Example ones in picture say 5800mah. I would bet they are roughly only 2500mah a piece. So 5000mah by running them parallel.
Energizer Lithium's are roughly 3000mah and are run in series to increase voltage only.

I believe Sightmark advertises 4 hours of run time on batteries using the IR, which I would have to assume would be with lithiums.

A simple proportion would suggest life on a pair being roughly 6 2/3 hours.

I am no engineer. Good at figuring things out, yes. Good at math, yes.

I will run a test on it this weekend and report back on life on the 18650's.

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#6592504 - 12/18/16 12:32 PM Re: external battery pack for photon xt [Re: bornforit]
Doggk9 Offline
Light Foot

Registered: 12/07/16
Posts: 11
Any conclusion on the runtime?

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#6600827 - 12/24/16 01:20 AM Re: external battery pack for photon xt [Re: bornforit]
Doggk9 Offline
Light Foot

Registered: 12/07/16
Posts: 11
Did it fry your photon?

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#6611722 - 01/01/17 09:39 PM Re: external battery pack for photon xt [Re: bornforit]
Doggk9 Offline
Light Foot

Registered: 12/07/16
Posts: 11
Did it blow up and injure you?

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