hi if you have two rx packs the same mah-one 4.8v and the other 6.0v-the 6.0v will give you more servo speed and torque (holding power )always good things to have-if using high current draw servos like digitals higher mah packs at 6.0 v are advised (advised with NIMH BATS also )with digitals the centering torque will be increased with 6.0vyou will not feel any difference when flying the plane on the sticks as the servo speed are only increased from .16 to .13 seconds as an example and the torque is also increase somethe servo manufacturers list the servo speed and torque output for both 4.8v and 6.0vthe 6.0v packs do for some reason hold the full capacity charge in the shop for a longer time than 4.8v from my own experience-i have been told you will use up a 6.0v battery faster than a 4.8v battery of the same mahbut i myself have never found that to be an issue but that may be due to the fact i fly mostly 60 size planes 2-3 times a day at the field so my bats are never run down near there capacity DO ENJOY REGARDS TONY ''THE OMEGA MAN" THINK PINK ! ! !

This voltmeter you guys always refering to, is it similiar to the picture I attached (this is what we use to test our batteries at the field). You plug it into your lead and "load" it and it gives you a reading

The problem with batterys is that they can give afalsevoltagereading after charge (surface charge) that can make a bad battery seem good.
You can take a battery that has charged overnight and load test with a battery checkerbefore a first flightand may be led into a false security that the battery is goodas the surface charge of the battery will give you a good reading, however if you load the battery for a period (five minutes wiggling the sticks) to remove surface charge then the loaded battery checker will give a true reading of the battery capacity.

The surface charge is "the false peak".

I have been flying with the Dx7 since they came out, my son uses the Dx6 and we both use only 1100-1200 Mah 4.8 volt NiCd receiver packs and have never had a brown out yet. We fly several size models with the RoadRunner being the largest and several 90 size models the smallest. I tried the 6volt pack some years ago and found it made my Big Bingo to "twitchy" for want of another word, went back to 4.8 and stayed. Simplifies charging too. We did use a small capacitor in the Dx6 Rx for a while after the scare came out about brownouts. (recommended by Spectrum).

I can't help but wonder why Spectrum uses different value Tx packs, 9.6 on DX7 and the cheapo snap in single cells in the Dx6. A friend recently had his Dx6 Tx upgraded to use a standard Rx 4.8Volt NiCd pack with plugs. The clips in the case were corroding and loosing contact. Lucky he was on the ground when he found out.

So what your saying is that immediately after a battery is unplugged it can give you a false peak which won't last long...and if after 5 so minutes whatever it reads is what the actual voltage for the pack will be at?

bingo, do not check the battery straight after charge, use the battery (wiggle the sticks) fora periodthen load test, now you have a acurate reading of what the battery charge/state is.

Thus the basic reasoning behind using a Voltwatch2. It does exactly that but does it all the time. So, after you turn everything on, get ready, start the engine, tune it, then range check it, by the time you get back from the range check, your "surface charge" should be consumed and it will give you what remains. Perfect application for Voltwatch2.

CGr.