right my dx8 lipo came today from hk and plugging the lipo in its reading from the tx 7.6v but the lipo is rated at 7.4. and the little batt graph is saying half full. but if it was nimh that kind of voltage would make the graph say fully charged.
i have selected lipo in the menu and the alarm is preset at 6.4v
will the .2 make a difference to the tx or is the tx reading out by +- .2
the other thing is there is no balance lead on it.
can i still charge it by my regular lipo charger. and if so the lipo is 7.4 2cell 4000. so does the 1 c charge rate still apply or should it be less.

2 cell li-po is 8.4V fully charged, 6V fully discharged (nominal volts is 7.4V)

I wouldn't put too much credibility to the Voltage display on the Tx
it may not be accurately calibrated.

Li-po's normally are shipped 50% charged so your Tx readings are close.

1C charge rate is fine on all the Li-Po's I have ever used.
The lack of a balance connector however is a greater concern
I would fit one.

here is some more info on it http://www.hobbyking.com/hobbyking/store/__19481__Turnigy_4000mAh_Spektrum_DX8_Intelligent_Transmitter_Pack_.html

it does say that it has inbuilt balancer as the spektrum one but i don't no what charge rate to charge it at.

Capacity: 4000mAh
1C charge is Two cell at 4A but......

"The Turnigy DX8 Intelligent Transmitter Pack also features a built in voltage protection circuit, this circuit will automatically cutoff once the pack drops to 2.85v per cell ensuring the battery will not be damaged if you accidentally leave your transmitter switched on. The voltage protection circuit will also restrict charging to 4.2v per cell ensuring the pack can never be over charged."

Without knowing the Specs. on the inbuilt protection cct
its impossible to give Safe charge advice.

Personally I'd limit charge to 1amp, to ensure you don't damage the Protection cct. in the pack (hopefully)

I'd have rather seen,No protection cct and a Balance connector on this Tx pack
Your Charger would then have control of the Cell voltages

Paul

thanks Paul i may use the power adaptor that came with the tx and charge it the slow way then the tx can charge it. keep the old one as a back up and charge it with my lipo charger. only takes a hour but with the tx more like over night.

the tx can charge nimh and lipo. im just in-patient and don't like waiting over night to charge them up.
thanks for the offer. i will see haw it goes and may call on your offer.

A quick search brought more info. Jeff

Spektrum DX8 - Installing the Lipo Battery
http://www.youtube.com/watch?v=ezzV82f5HyI

DX8 Lipo Charging
http://rc.runryder.com/helicopter/t622650p1/

So you should be ok
but don't expect Fast Charging from the Spektrum system

well had this tx lipo for around 5 months and its working extremely well.
iv charged it up 3 times in all this time and even then the lipo never reached the point of the lipo alarm going off. more of a top up than a full charge.
i think this is really good with all the scratch building i do so its on a lot, in setting and tweaking my builds.