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ETX 80 light moble power source?

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#1 gastargazer01

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Posted 08 February 2013 - 04:40 PM

I have a ETX80 backpack scope I bought about a month ago. I had one of the first ETX125 1990something and forgot about the rechargeable battery issues, can't use em.
I need a light way to power this scope. Could I add 2 more batteries and find a 8 battery holder? I hike in the mountains and would be nice to use it as I was hoping.
I just ordered the AC adapter for when I am new 110 but I refuse to by batteries that end up in the recycle bin as trash.

#2 Christopher Erickson

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Posted 09 February 2013 - 01:06 AM

A LiIon battery pack would be very light compared to other battery chemistries.

#3 rmollise

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Posted 09 February 2013 - 08:55 AM

I have a ETX80 backpack scope I bought about a month ago. I had one of the first ETX125 1990something and forgot about the rechargeable battery issues, can't use em.
I need a light way to power this scope. Could I add 2 more batteries and find a 8 battery holder? I hike in the mountains and would be nice to use it as I was hoping.
I just ordered the AC adapter for when I am new 110 but I refuse to by batteries that end up in the recycle bin as trash.


Forget D batteries or whatever else the thing uses in the battery pack. That's no way to fly.

Get thee to Wal-Mart or Pep Boys or Harbor Freight and pick up an automotive jump start battery. Really doesn't get more perfect for a scope: carrying handle, built in charger, light for when you are ready to disassemble the scope, cigarette style plugs. Most are about 17ah, which will run your mount all night.

#4 Stew57

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Posted 09 February 2013 - 11:18 AM

I have used a 12v dewalt tool battery before. The little etx80 does not need much juice when used visually.

#5 gastargazer01

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Posted 10 February 2013 - 04:33 PM

I will look into A LiIon battery pack that I can add a 9v battery connector to.

#6 gastargazer01

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Posted 10 February 2013 - 04:38 PM

At around 25lbs a jump box is a bit much weight to add to my pack weight when hiking in 5+ miles but I am sure will work great for a drive in spot.

#7 gastargazer01

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Posted 10 February 2013 - 04:51 PM

I currently have 18v Ryobi Li tools I will see if they make a 12v version of the batteries that I can use with my Ryobi smart charger for Li batteries. Side note I like the Ryobi tools because when the battery technology change from NiCad to Li the connector stayed compatible unlike my Ridgid tools.

#8 Texano78704

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Posted 25 February 2013 - 10:57 AM

I use 3500 mAH NiMh AA batteries in my ETX-90. They work great and are rechargeable. You can find them on eBay.

#9 gastargazer01

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Posted 25 February 2013 - 06:42 PM

Thanks for the info. I will get some 3500 mAH, mine now are 2300 mAH at 1.2v each for a total of 9.6v to the scope.

#10 jgraham

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Posted 27 February 2013 - 12:45 PM

I use a small jumpstart battery on mine when I'm at home. For travelling light I make sure to pick up a fresh set of alkalines, they're good for at least a couple of evenings. And yes, the ETX-80 works fine on 12VDC, so a small external battery pack works great.

#11 RocketScientist

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Posted 17 March 2013 - 11:02 PM

Get thee to Wal-Mart or Pep Boys or Harbor Freight and pick up an automotive jump start battery. Really doesn't get more perfect for a scope: carrying handle, built in charger, light for when you are ready to disassemble the scope, cigarette style plugs. Most are about 17ah, which will run your mount all night.


Rod's absolutely right here. I bought a Harbor Freight jump-start battery and built a custom cable that powers my ETX-80 through a 9V battery connector and simultaneously runs the fan on my Z10 through a PowerPole.

Just be careful with polarity when building the cable! This is my perfect setup for star parties or car-camp trips. It isn't practical for hiking, however; if you are serious about backpacking with a scope, you need to go the no-electronics route.

I bought my ETX-80 so I'd have a self-contained (no paper charts) observing system for car-camping, and it has been a success with the jump-start battery. If I can just get some free time I plan to write a detailed review of the little guy, including discussion of the battery.

#12 gastargazer01

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Posted 18 March 2013 - 03:38 PM

I just bought some 3500 ma batteries, 16 for like $13us on amazon. I have not had a chance to charge them and try them out yet. As soon as I do I will report my findings. I do like the jumpbox idea, I could use one for other things as well.

#13 RocketScientist

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Posted 18 March 2013 - 08:05 PM


One other thing -- if you use AA batteries, make sure they are fully charged. The ETX-80 does strange things when the voltage level drops below a certain point.






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