Posted 29 July 2013 - 06:50 AM
Posted 29 July 2013 - 08:23 AM
The battery pack Eddie linked is a good one with plenty of power for your scope, but will not fit in place of the standard battery compartment. It uses ten C size cells as opposed to the 8 AA cells for the internal compartment.
I originally had the same idea as you and purchased this one, composed of AA sized cells, to try out:
My plan was to remove the base cover, and cut the plastic battery compartment out of it so I could use this slightly larger battery pack. This first photo shows the size of the pack compared to the battery compartment:
1_NiMH wont fit by dkuchta5, on Flickr
As you can see, it wouldn't fit without cutting out the battery compartment. This next one shows the base opened up to see how much room is available beyond the battery compartment. Not much!
2_Base Open by dkuchta5, on Flickr
Laying the battery in the space shows that it will fit, but it is very tight and presses against the connectors on the circuit board. Not a good situation:
3_Tight Fit by dkuchta5, on Flickr
I decided it didn't make sense to try to fit it into the space where the battery compartment was. This size pack is not bad, but it only allows 2-3 hours of use and I really preferred something with more capacity - like the one in Eddie's link. I'd recommend getting that one, and velcroing it to the inside of the fork arm. There really is no big advantage to getting one that fits into the compartment space.
Posted 29 July 2013 - 09:13 AM
Posted 29 July 2013 - 06:40 PM
Posted 30 July 2013 - 06:22 AM
Not really sure what mod you're referring to ... since it didn't really happen.
If you mean the battery pack in place of the battery compartment, the small battery pack shown in my photos above was a bit too large so I abandoned that idea. I still do use that small pack if I'm just going out for a quick session, or sometimes as a backup to my larger pack.
If you mean simply using a NiMH battery pack instead of a big lead-acid jump start unit, then yes, that's a good idea. However, using the larger pack like the one that Eddie posted will provide more like 4-5 hours of use.
I have a similar NiMH battery pack that I use as my main battery for most sessions.
The only difference between this and the one that Eddie linked is the form factor. I bought this one first, and the batteries were laid out side by side to form more of a block arrangement, which I velcro on to the base. The pack that Eddie linked has the batteries laid end to end so it is more of a flat pack. I like that arrangement better because it can be velcroed against the inside of the fork arm and be more out of the way.
Either of these larger packs should last 4-5 hours powering both the scope and dew heaters, longer for the scope alone.