help me to identify this battery

[ww2warrior]

Rona have that kind of battery. You should check this out.

[Craig_W]

No joy at Rona or camera shops. Also checked out the PX27 specs, but they are too large (12.7 mm diam.)

I think I may have identified it though! There is a 6 volt alkaline battery called a "GP-11A" which is used in remote car alarm transmitters and garage door openers. This battery seems to be mainly used in the UK, and much more rare in North America. GP-11A is the most common name, but they are also called 11A, G11A, or MN11.

The diameter is right on at 10.0 mm. They are a touch long at 16.0 mm, but still in the ballpark. I'm a bit worried about the voltage at 6 volts, as my old one was putting out 3.6 - but of course it was half dead... Does anyone have one of these sights with a fresh battery that they could check with a volt meter?

Here's one site that sells them. Note that this is an FYI, and not an endorsement. I haven't tried them yet, and as I mentioned the voltage could be a bit high. I will order a couple and try one out though, either from this seller or somewhere else...

http://www.batteriesinaflash.com/ind...roducts_id=219

[Craig_W]

One more thing - Here is my emergency quick-fix:

Find an old pen with a plastic barrel 10 mm in diameter. (The diameter may taper, so it helps to have a caliper so you can measure and pick the section with the correct diameter.) Cut out about a 15 mm section of pen barrel. Ream out the inside to about 8 mm diameter. (Everybody has an 8mm drill bit, right? ) Now slide in 3x type 393 (AKA: SR48) button cells. Slide the whole assembly into the sight positive side first (at least on my sight.)

Of course you could also just wrap up the batteries in tape till you get a 10 mm diameter! Just make sure the cells stay touching each other.

This is working fine for me, but I don't think the battery life will be very impressive. The 3 batteries also cost me $9, so consider this an emergency fix!

Hope this helps someone! I understand that some models of ACOG red dot sights use two readily available LR44 cells, so if you're thinking about buying one of these, it may be a good idea to confirm what type of battery is uses before you buy! (Strangely enough NONE of the reviews mention what type of battery is used.)

- Craig W (Skully)

Good work, im still trying to find a replacement myself