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Mar 25th, 2012
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Question on IR Hunter USB Battery Pack #7236539 07/26/18 08:48 PM
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Stripermania Offline OP
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Anyone here use the UNV IR Hunter USB Battery Pack $329. Concern I have is that the internal battery is not replaceable so if the battery fails, you are down $329. Unlike the Armasight pack, $325, where it uses 18650 batteries and they are couple bucks each. Like most of my power tools, battery pack only lasts a couple of years. Is there anything special about the UNV battery pack that would last longer than a few years. Thanks for you input.

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7236574 07/26/18 09:23 PM
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Double Naught Spy Offline
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The internal "battery" isn't a battery at all, just a dummy spacer that is the same size as a CR123 that goes in the battery tube on the scope. I don't think it will ever fail.

The external battery is nothing more than a battery used to charge cell phones. Last I checked, they were using these.
https://smile.amazon.com/gp/product/B0194WDVHI/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

So I purchased a spare. At any given time, I have one on the rifle and one on the charger. However, you can get any variety of external batteries, spending more or less depending on whether you want more less power and how you want to carry it.


Si vis pacem cum sus, para bellum.
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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7236609 07/26/18 09:59 PM
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DavidK Offline
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This is what I use from Third Coast Thermal. It is an adapter that can be used with either the IR Hunters, REAP-IR, IR Patrol, etc. You use just the adapter with the IR Hunter, add the factory Extender to use with the REAP-IR.

Takes two rechargeable batteries that last longer than CR123's. Comes with the adapter, 4 batteries and a charger. Cheaper alternative, small, doesn't take up additional space.



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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7236714 07/26/18 11:47 PM
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I dong think you have to worry about the spacer cell failing. More likely something in the system breaking . Wires, fitting ect . The newer stuff is a little more fool proof .

The trijicon factory battery extenders can be doubled up and used as well, with rechargeables .

This is a little more handy way to do it. No wires to snag, or get tore up

Last edited by Midwaytmm; 07/26/18 11:54 PM.
Re: Question on IR Hunter USB Battery Pack [Re: Midwaytmm] #7236772 07/27/18 12:40 AM
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Originally Posted By: Midwaytmm
I dong think you have to worry about the spacer cell failing. More likely something in the system breaking . Wires, fitting ect . The newer stuff is a little more fool proof .

The trijicon factory battery extenders can be doubled up and used as well, with rechargeables .

This is a little more handy way to do it. No wires to snag, or get tore up


Using the longer adapters and hitting them on stuff or bouncing around in my gun bag caused me to send back in the l scopes because the brass part came out of the scope. Haven't had a problem since going to the shorter adapter


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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7236947 07/27/18 05:09 AM
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Stripermania Offline OP
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Thanks guys and more questions.
DNS - the Amazon battery pack is $29 so the dummy cell, end cap and cables for $300. Seems high

David - couldn't find the item on Third Coast Thermal Website. Is it just a longer battery extender to hold 4 cr123

Midwaytmm - so you use the factory extender to hold 3 cr123, what brand rechargeable are you using. Some I bought doestn't output enough juice to turn on the IRMK3-35

Thanks again

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7236957 07/27/18 05:33 AM
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hdfireman Offline
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OK, You are adding weight with these external battery extenders. It's not just the weight , it's the cantilnvered weight of off of the original battery pack. That extra weight in concert with the recoil can and most likely will separate the battery compartment from the housing.

I have used the UNV battery pack for about 2 years and have had zero issue. In 17* temps it lasted 13 hrs which is the best on the market.


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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7237016 07/27/18 11:22 AM
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Midwaytmm Offline
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16650 rechargeable. Youíll use 2 of them instead of the 123s. Should be less than 20$ for batteries and charger

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7237406 07/27/18 05:15 PM
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Stripermania Offline OP
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Midwaytmm - that's clever and I liked it. I will get the second extender and in the mean time, I will see if I can get my buddy to machine me a long one so it will be one piece instead of 2. I just don't like having a battery pack hanging off the gun. I have the Armasight battery pack and I love the extended run time but hated it when I am walking around stalking prey.

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7237522 07/27/18 07:04 PM
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Actually looked at having some made. Didnít make any sense from a financial standpoint at the time. But I also didnít realize people would pay 300$ for 16$ worth of batteries, and 20$ worth of machined aluminum......

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7237603 07/27/18 08:10 PM
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Originally Posted By: Stripermania
Thanks guys and more questions.
DNS - the Amazon battery pack is $29 so the dummy cell, end cap and cables for $300. Seems high

David - couldn't find the item on Third Coast Thermal Website. Is it just a longer battery extender to hold 4 cr123

Midwaytmm - so you use the factory extender to hold 3 cr123, what brand rechargeable are you using. Some I bought doestn't output enough juice to turn on the IRMK3-35

Thanks again


Seems high? You are paying for proprietary technology, plain and simple. You can go with a proven design or you can go with the cheap experiment on your own scope and see if it all works out or not. Let us know how it works and keep us posted!


Si vis pacem cum sus, para bellum.
My Videos https://www.youtube.com/user/HornHillRange
Re: Question on IR Hunter USB Battery Pack [Re: hdfireman] #7237676 07/27/18 09:25 PM
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Originally Posted By: hdfireman
OK, You are adding weight with these external battery extenders. It's not just the weight , it's the cantilnvered weight of off of the original battery pack. That extra weight in concert with the recoil can and most likely will separate the battery compartment from the housing.

I have used the UNV battery pack for about 2 years and have had zero issue. In 17* temps it lasted 13 hrs which is the best on the market.


Exactly right. You are adding moment load to an already weak component. That additional moment load coupled with brass fittings and recoil is not a good thing structurally. I'm betting the manufacturer will know exactly what caused it.

I have used the UNV product for over 2 years on 4 guns used regularly, maybe closer to 3 years with no issues. If you plumb the wires properly and attach the bag with the battery correctly, you won't hardly notice it being there.

Last edited by dfwroadkill; 07/27/18 09:31 PM.
Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7237922 07/28/18 03:27 AM
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DavidK Offline
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Originally Posted By: Stripermania
Thanks guys and more questions.

David - couldn't find the item on Third Coast Thermal Website. Is it just a longer battery extender to hold 4 cr123

Thanks again


No, they take protected cell rechargeables


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Re: Question on IR Hunter USB Battery Pack [Re: hdfireman] #7237928 07/28/18 03:38 AM
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Originally Posted By: hdfireman
OK, You are adding weight with these external battery extenders. It's not just the weight , it's the cantilnvered weight of off of the original battery pack. That extra weight in concert with the recoil can and most likely will separate the battery compartment from the housing.


That's not the issue after I discussed with customer service. On my IR Hunter Mark III looking at the paperwork they replaced it, but it was fine, They have a bunch of these coming in for repair.

My REAP-IR I sent in specifically because the battery compartment came loose. In the REAP-IR I used almost exclusively as a spotter. I never used an aftermarket adapter. The couple times I had on a gun I used CR123's. As a spotter I used the UNV external pack until it broke. The piece the screws in to the battery compartment was no longer working, I tried different cables, same thing. One of the guys I hunt with had the same problem when we were shooting a contest.


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Re: Question on IR Hunter USB Battery Pack [Re: dfwroadkill] #7237934 07/28/18 03:47 AM
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Originally Posted By: dfwroadkill
Originally Posted By: hdfireman
OK, You are adding weight with these external battery extenders. It's not just the weight , it's the cantilnvered weight of off of the original battery pack. That extra weight in concert with the recoil can and most likely will separate the battery compartment from the housing.

I have used the UNV battery pack for about 2 years and have had zero issue. In 17* temps it lasted 13 hrs which is the best on the market.


Exactly right. You are adding moment load to an already weak component. That additional moment load coupled with brass fittings and recoil is not a good thing structurally. I'm betting the manufacturer will know exactly what caused it.

I have used the UNV product for over 2 years on 4 guns used regularly, maybe closer to 3 years with no issues. If you plumb the wires properly and attach the bag with the battery correctly, you won't hardly notice it being there.


That's not the issue. You can discuss with them, they are I believe replacing all battery compartments if scopes coming in for repair.

I ran only CR123's and the UNV external battery on my REAP-IR, so apparently the unv adapter caused my issue if we go by your logic. They have changes for ones that are replaced. My UNV kit is broke, the piece that adapts to the battery compartment no longer works, won't power up, new cable doesn't make a difference. One other guy I hunt with has a similar problem.


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Re: Question on IR Hunter USB Battery Pack [Re: DavidK] #7237991 07/28/18 10:48 AM
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hdfireman Offline
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Originally Posted By: DavidK
Originally Posted By: dfwroadkill
Originally Posted By: hdfireman
OK, You are adding weight with these external battery extenders. It's not just the weight , it's the cantilnvered weight of off of the original battery pack. That extra weight in concert with the recoil can and most likely will separate the battery compartment from the housing.

I have used the UNV battery pack for about 2 years and have had zero issue. In 17* temps it lasted 13 hrs which is the best on the market.


Exactly right. You are adding moment load to an already weak component. That additional moment load coupled with brass fittings and recoil is not a good thing structurally. I'm betting the manufacturer will know exactly what caused it.

I have used the UNV product for over 2 years on 4 guns used regularly, maybe closer to 3 years with no issues. If you plumb the wires properly and attach the bag with the battery correctly, you won't hardly notice it being there.


That's not the issue. You can discuss with them, they are I believe replacing all battery compartments if scopes coming in for repair.

I ran only CR123's and the UNV external battery on my REAP-IR, so apparently the unv adapter caused my issue if we go by your logic. They have changes for ones that are replaced. My UNV kit is broke, the piece that adapts to the battery compartment no longer works, won't power up, new cable doesn't make a difference. One other guy I hunt with has a similar problem.


Sorry to disagree but it was an issue. You also make no sense when you say according to his logic the UNV adaptor caused your issue. We are saying the added length and weight of battery extenders has caused the battery compartments to separate from the housing. The UNV adaptor is not adding any extra weight or length. Nor is it an extender.

You should call UNV on your adaptor not working and see what they will do for you.


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Re: Question on IR Hunter USB Battery Pack [Re: DavidK] #7238053 07/28/18 01:22 PM
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Originally Posted By: DavidK
I ran only CR123's and the UNV external battery on my REAP-IR, so apparently the unv adapter caused my issue if we go by your logic. They have changes for ones that are replaced. My UNV kit is broke, the piece that adapts to the battery compartment no longer works, won't power up, new cable doesn't make a difference. One other guy I hunt with has a similar problem.


First, I know that Tyler has been replacing any that do not work for any reason, customer caused or not. You might call him.

The UNV does not add appreciable moment load beyond the original product. The devices that substantially increase the length and weight do. There is a difference. The battery box problem that you speak of is an altogether different issue.

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7238187 07/28/18 05:36 PM
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From talking to people, I'm not the first one that had them break. I'll get the other one from the guy and troubleshoot.

I'm in Texas right now, when I get home I'm going to do an analysis. Being an electrical engineer I'll grab some friends that are mechanical engineers. We'll weigh all parts, we'll calculate the forces as strength or energy as an attribute of action or movement, related both to weight and how energy from recoil of different calibers affect these numbers.

I can tell you, I've only shot in 6.8 as the largest, the recoil of a 308 is much greater and I know people shooting 308s all the time without a problem. I do know from my communication that the battery compartment on the Trijicons is a poor design, and that this is being remedied. One thing I can't calculate is lateral forces unless I have some design specs from Trijicon such as contact surface area, adhesion properties, space tolerances, and dimensions.

When talking about calibers, using Chuck Hawks guide, a 6.8 SPC with a 120gr bullet at 2460 GPS has a recoil energy of 7.5. A 308 with a 165gr bullet at 2700 GPS has a recoil energy of 18.1. I know guys shooting adapters with their 308s, no problems. It comes down to other issues. I was glue on my repaired reap that I will not have any more issues.


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Re: Question on IR Hunter USB Battery Pack [Re: DavidK] #7238210 07/28/18 06:33 PM
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dk... u cud prolly b a rokket scientest, ceptins u dunno anythin bout rokkets... or do u?

b advized... im the only one whoz evr one an argument with dk. not cuz im better then he is. cuz im smarter!!

Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7238381 07/28/18 10:33 PM
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Haha, well I know this, you think you might know what I know what you might be talking about lol


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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7257939 08/16/18 02:49 PM
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Weighed the parts to power the Trijicon scopes. If you end up sending you IR Hunter, REAP-IR, etc in for any repairs, firmware upgrade, etc., they will upgrade your battery compartment if it was manufactured before a particular date. All being produced now have upgraded battery compartments.

We sat down and started crunching numbers on force exerted by a certain weight, however there are too many factors that affect the numbers and cannot be rolled up as a definitive value because of the different factors. Those factors include cartridge, bullet weight, firearm weight shooter form, suppressors, muzzle brakes, recoil differences, accessory mounts, cables, etc. We calculated straight line general forces exerted by particular weights listed below, which are valuable, but not definitie due to other factors in the construction of the scopes.

Many are shooting battery caps with different batteries or external batteries and adapters with no issues. Other may have failed parts with external batteries and adapters, or scope failures due to poor design that has been remedied if your scope goes in for repair or upgrade and all new scopes. I'll leave it up to the buyer to decide.

I also received some information on an issue that Trijicon will address if needed. If you have any issues with installing batteries or they fit really tight, look inside your scopes battery compartment and see if there is excessive glue on the walls of the compartment.

Here are the approximate weights using my Pact digital scale. All weights are in grains and I converted also converted to ounces for a better perspective for some.

All photo's are located here:

http://www.pbase.com/rottweiler/battery_

I abbreviated vendor name, I'm not saying anything is right or wrong, good or bad, etc, this is the customers choice. Do they want a certain battery life, added weight, added equipment etc.

Long battery cap NVO - 549.7grs = 1.256 oz
Short battery cap TCT - 302.7grs = .692
UNV external battery adapter - 519.2grs = 1.187 oz
UNV dummy CR123 - 92.5grs = .211 oz
UNV cable connector approx. - 32.5grs = .074 oz (I added just a basic connector because this adds to the weight and depending on how the user mounts or attaches their cable it can add additional straight line or lateral forces)
Factory cap - 72.8gr = .166 oz

16650 battery - 610grs = 1.394 oz
17500 battery - 443.8grs = 1.014 oz
CR123 battery - 253.3grs = .579 oz

UNV kit - 644.2grs = 1.472 oz (does not include weight of battery, case, or cable, just what attaches to the battery compartment)
TCT kit (Mark II & III) - 1190.3grs = 2.721 oz
NVO Mark II & III kit - 1769.7grs = 4.045 oz
Mark II & III factory without extension, two CR123's - 599.1grs = 1.369
Mark II & III factory with extension and three CR123's - 1111.5grs = 2.541 oz





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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7258522 08/16/18 10:42 PM
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xcuse me sir... but im gonna need to chk ur math. mind posting thoz nummers u crunched...

Re: Question on IR Hunter USB Battery Pack [Re: djones] #7258742 08/17/18 01:17 AM
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Originally Posted By: djones
xcuse me sir... but im gonna need to chk ur math. mind posting thoz nummers u crunched...


Even if I did you'd be confused lol.

But if you really wanted a simple approach, recoil energy is E=1/2 MV Squared, with "M" being weight (mass) of the gun and "V" being the recoil velocity. So you square the velocity recoil (have to know the weight of the bullet, powder charge and its velocity when exciting the bore). Then you multiply by the weight of the gun and divide by twice the acceleration of gravity, and you get the recoil energy in foot pounds.

Sounds easy, right? Well not quite, that's a simple baseline calculation, it's useful, but not the big picture.

Next time we're hunting and you countdown 3... 2...1..., I'm going to ask if you want the numbers? Lol.


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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7258794 08/17/18 02:05 AM
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When we think of Newtons Law, that every action creates an equal and opposite reaction, there are a lot of factors considering parts, not just how weight affects them, but how the are designed, how they are held in place, etc. If you sit in a chair, the weight of your body creates one action, the chair against you creates another.

Use the energy formula to figure out recoil energy, but many other factors determine whether something will be held in place.

So, what we really need is more data to calculate force, which is strength or power exerted upon an object.


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Re: Question on IR Hunter USB Battery Pack [Re: Stripermania] #7259074 08/17/18 12:46 PM
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yea i new awl that. gfy

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