Which 7.9mm battery cells for reticle eyepiece?

[GavinC]

Hello,

Having picked up an unbranded illuminated reticle eyepiece it's come without batteries and the eBay seller isn't communicating (this was bought from a real person in the UK, not from China, so I'd hoped for better).   I can get my vernier caliper in to see that the cells need to be 7.9mm in diameter, so that narrows things down, but I can't get the depth of the battery compartment.  By eye I reckon I need at least 3 cells.  Does anyone use similar 7.9mm sized cells and, if so, can you tell me what they are and how many?

Many Thanks,

Gavin

[JamesF]

I'll just nip out to the observatory and check mine.

James

[Davey-T]

Probably LR41 watch batteries.

Buy a pack of four cause no doubt you'll forget to turn it off and find they're flat when you come to use it one night 😂

Dave

Edited January 20, 2020 by Davey-T

[JamesF]

No, mine are 11.5mm diameter (AG12), so clearly a different model.

James

[RT65CB-SWL]

I have an Orion 12.5mm Plossl - says 'AG10' and it takes three of them.  

I think this list is the compatible codes: LR54, CR1130, AG10, 1130, GP189, V10GA, 10L/122, 189, 389A, A05, A120, G10, G10A, GP89A, L1131, LR1130, RW49, WL10

note: '+' is face up / nearest the eyepiece on mine.

[GavinC]

Dave, thanks.  I'll get some LR41's ordered as the AG10/12s that some people have in theirs are not going to fit in my eyepiece.

[JamesF]

I imagine that as long as you get the correct number of batteries (so the voltage is correct) then you should be ok.

James

[GavinC]

Thanks. The local pound shop had a pack of 10 and I get light with two cells, so thanks for all your replies.