Best high-powered portable energizer with internal batteries?

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supsup

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I go camping with the horse pretty frequently, and I'm looking to buy a new travel energizer to keep his small paddock electrified (or occasionally 2-3 small paddocks). Any recommendations on small energizers (preferably powered by internal D-cell batteries or similar) that really deliver a zap?

I have tried the following:
Fenceman DP350B - completely useless. Even without load, it will only come up with 2000V on my fence meter when run on D-cell batteries, which is so weak I can literally hold on to the fence and not be bothered. Looks like this is actually a feature of this model (specs say it's just that weak - not broken). See also this old thread - wish I'd seen it earlier!
http://www.horseandhound.co.uk/forums/showthread.php?667284-Fenceman-Dp350-b-energiser-problems
For reference, the 12v battery energizer I use at home will reach around 8000V when it's zapping well.

A friend had something that looked like a Speedrite AN20 energizer (though I think hers was going by a different brand name). It used to work okay, but hers as well as another one I saw recently stopped working, and both made a really annoying high pitched whining noise when charging up between zaps. On paper, this one has 5800V output (on an open circuit), but drops down to 1000V under 500ohm load.

I've seen, but never tried the Shrike energizers. Any opinions on those? Supposed to have 8600v output (without load), but drops to 580V under "heavy load" (whatever that means). It would be good to hear what people's experiences are when in actual use.

Any other ideas?
 
I had a Shrike which was excellent for a small area/ strip grazing it lasted years in regular use, eventually it pretty much disintegrated but I would certainly buy another for a small paddock, the batteries do run down fairly quickly but give a good shock when new.
 
I have a rutland ES something will look it up but small blue box, takes 2 D-Cell batteries I use it at home to electrify 2 strands of wide tape all the way up the side of 1/2acre long field batteries last 3 weeks and its on 24x7 my lads never escaped. Haven't tested to see what the real power output is but he won't touch after the 1st day he tested it out that was it. I've had it 2years in daily use and not failed me was about £100 so pretty good value. My yard owner has the shrike and she likes it but finds it a little fiddly and prefers mine so has bought one recently for her second field as all our internal fencing is tape. Her horses are more ikely to barge through the fencing than my big wimp and she's never had 1 escapes when it was on and I think something scared them and they bolted through
 
Instead of looking at the voltage check out the joules. Anything less than 1 joule is useless and good for only a chicken run. Aim for something more than 3.
 
Equidae - I have been looking at stored/output Joules as well, but those don't seem to correlate well with the actual zap I can get from the fence. Maybe I'm missing something...
None of the small portable ones run on internal D cell batteries make it up to 1J. Based on Joule rating, the Fenceman above should be the best, yet it seems to perform worst:

stored J output J V (no load) V (under load)
Fenceman 0.15J 0.1J 2040V
Shrike 0.04J 0.03J 8600V 580V
AN20/PEL 5 0.05J 0.04J 5800V

Why does my fence tester measure voltage then, if it's the output energy that is relevant for the zap? I'm genuinely trying to figure this one out because I'm sick of wasting money on fencing equipment that doesn't seem to do the job...

Good tip BTW to try an endurance forum...
 
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