HP03 BlackHawk

Has any one tried using a 3 cell li-po battery in any Walkera transmitter? Could this cause possible damage to the TX?

soneebee

I think the Walkera TX is rated at 9V if you plug the lipo it my overpower the TX and burn the IC regulator... am not sure havent tried it though....

hueyman

My Feedback: (2)

i've read a few people have been using the 11.1volt 3s lipo's in a few different transmitters but not walkeras. most tx are powered with a 9.6 volt pack. I wouldn't try it, if the walkera tx won't regulate 11.1 volts you may fry it....not good unless the walkera tx is a spare. why not get a 1600mah nicad pack and use the plug from the walkera battery holder? the 1600 pack should fit in place of the battery holder.

soneebee

I am not that sure if you can if the standard rechargeable battery for the pack is 9.6 for a set of 8 but if you use a regular alkaline batteries rated at 1.5V it then can regulate a 12V pack. maybe it is possible that the TX can handle a 11.2V pack.. but Iam not really assured that it can handle the current burst of the lipo.. it may heat up the electronics any fry it.

HP03 BlackHawk

The manual says the transmitter's working voltage is 9.6~12v ... I have two packs-one has 8 AA Duracell 2300mAh Rechargeables 9.7volts and another using 8 AA Energizer e2 Lithium cells totaling 12.7volts and compared them with a range check on a new Walkera DF4--I can walk away an extra 15ft with the antenna collapsed using the e2 Lithium batteries and after 4 equal flights on each pack the Duracell rechargables were down to 9.58volts and the e2 lithiums still show 12.7volts. I have a 11.1v 2500mAh li-poly that will fit in the back of the TX that's being used as a paper weight because it won't keep a Zoom/Shogun in the air for more than 30sec a hop but shows 11.6v after charging and wonder how it would do in the TX but I don't want to fry one to find out...

ViciousHeli

Energiser states that their batteries can go as high as 1.75V for an AA. So I didnt give it much thought when I put 3 18650 LiIon batteries in my transmitter. Works great. But may not be the same for every one.
I recomend using the original NiMh battery that no one uses for their heli and has laying around to power the transmitter.
Happy flying

soneebee

have tried to plug the lipo on the TX.. it work it did not fry it.. its just like any other rechargeable battery.. only difference is the TX became lighter due to the lipo weight.. but the performance is the same..... i guess the lipo works fine with the TX... I did not test if how log will my 3s 2200mah 11.2V 10C lipo will last on the TX ...

hueyman

My Feedback: (2)

a good fully charged 3s lipo starts out at 12.6 volts. if you've been running the e2 cell pack and actually measured 12.7volts before and after use, then the lipo should work but long term continuous use may cause components to heat up and fail. At the very least, i would measure the fully charged lipo with the same meter you used on the e2 cells to make sure your meter isn't wacko.

HP03 BlackHawk

I now have 8 flights (8 full battery packs) and the voltage for the tx pack with 8 Energizer e2 cells is 12.12v. I bought a second set of e2 cells for my 6ch Walkera TX that have a exp. date of 2021 (the first set is 2020) and after installation but before their first use their voltage is 13.41v!

ViciousHeli

as I said earlier Energiser quotes 1.75V per cell 8x1.75=14V ,ost reputable battery manufacturers have this data on their web site.
I've had about 20hours on 3 series 18650 LiIons (never charge higher then 12.6v) with out a problem.
Though I would recomend changing the bias on the main output transistor to reduce power output and heating. Or at the very least put a better heatsink on it.

Cheers
Vicious Heli

Rattlecat

You may want to look at getting a 10 cell AA holder for NIMH batteries, then devise a reliable way to attach it to the back of the TX. I read the TX draws 200 ma, so it should last near 10 hours of operation with the 2000ma AA NIMH's. Another alternative would be to get a 2 cell AA holder, attach it to the battery cover, make a series cable adapter to convert the 8 cell holder you have into a 10 cell. Make 2 notches in the cover, the 8 cell cable comes out, plugs into the series adapter, then back into the TX. It would be a good idea to glue or screw a little plastic box to slide the 2 cell holder into, with maybe a velcro strap to hold the 2 cell in the box. I am working on it.
I did some antenna in glitch testing and with 8 cells got occasional glitches, especially around large metal objects. Then I used a 12v regulated power supply that plugged into the charge port and got zero glitches. As a matter of fact, I set the DF 4 on my bench for hours with no glitches, but did not test very long with motors running.
The signal the receiver gets will fall off at this rate : double the distance and the received power falls by the square root. 25/2 = 12.5, the square root of 25 is 5. Better run it at 12 volts , and get all the power out of the tx you can, but don't exceed the 12v rating.
And don't use 10 AA cells other than the 1.2v NIMH or NICAD. Lithium or alkaline cells will exceed the 12 volts.
Stableblade

Rattlecat

Oh yea, about the marginal battery, I wouldn't trust the value of your aircraft to what you would save on a battery.