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JR DSX9

Fast charging NiMh pack in the TX?

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Gary Murphy 116/03/2019 23:53:27
378 forum posts
14 photos

Had to replace the supplied NiCd TX pack.

Went with Sanyo Enerloop 2000mah pack. This pack has a flylead with Tamiya style lead. It would be easy just to take the TX battery cover off and fast charge Rather than keep taking the whole pack out like I used to do BUT would doing this harm the TX?

I know its recommended to wall charge but it takes so long and normally inconvenient to wait 10 hrs_+

Peter Christy17/03/2019 08:19:45
1547 forum posts

I got my Eneloop pack from Overlander, and it came with the correct Molex connector to connect to the board, plus a JR style plug in parallel. I just pop the back plate off and plug it into a fast charger at around 1 to 1.5 amps. Its usually charged in around 20 mins or less.

Not had any problems in several years of doing this!

--

Pete

Gary Murphy 117/03/2019 11:01:27
378 forum posts
14 photos

Pete, thanks for that,got mine from same place. Wanted to do the exact same thing.

Thought it would be safe NOT using the TX charge port and wiring but wanted to make sure.

Martin McIntosh17/03/2019 21:12:15
avatar
2921 forum posts
1073 photos

I have used Eneloops in my JRs for years but now changed to Hobbyking 1500 3s LiFe packs. Very cheap, reliable and come with a Molex and servo plug so just remove the cover and charge via the servo plug at 1.5A. At the price you can afford to replace every year should you wish but I have never found the need so far.

Gary Murphy 117/03/2019 22:17:55
378 forum posts
14 photos

Martin, I was going to go that route BUT read that "non spekturm" JR basically should not use LiPo. Read a few neg comments so bottled it.

Peter Christy18/03/2019 10:42:03
1547 forum posts

I've put one of the HK LiFe packs in my PCM9, and that too is fine.

Gary: Don't confuse LiPo and LiFe! A 3-cell LiFe pack (also referred to as nanophosphate sometimes) is almost exactly 9.9volts, and a very close match for an 8-cell NiXX pack. As well as the PCM-9, I'm also using them in my Ace MicroPros, one on 459 MHz, the other on 2.4 GHz, as well as my original 459 MHz prototype transmitter, now nearly 40 years old!

Unlike LiPos, LiFes very rarely - if ever - spontaneously combust! Much safer for charging in the house! Also the voltage is much closer to the desired 9.8v than you can get with LiPos.

The only slight downside is that they tend to hold their voltage right to the last gasp, so you get no warning when its likely to go flat! However, there is such an excess of capacity for the application that you will never normally run one flat in a days flying!

You also need a LiFe capable charger. Most modern chargers can cope OK, but some older ones may not. DO NOT use the LiPo setting (or NiXX) to charge a LiFe!

--

Pete

Martin McIntosh18/03/2019 11:24:41
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2921 forum posts
1073 photos

Beat me to it Peter!

Gary Murphy 118/03/2019 12:05:57
378 forum posts
14 photos

Yeah, I thought we were talking LiPo! I will see if my charger can handle LiFe. Its A revolectric? if I recall.

Gary Murphy 118/03/2019 22:22:15
378 forum posts
14 photos

Looking at my charger manual it says LiPo,LiOn and A123

I looked up A123 it it says they are LiFe. Is this correct?

Frank Skilbeck18/03/2019 23:10:54
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4447 forum posts
101 photos

Yep A123 are LiFe chemistry, I charge my A123 cells on my chargers LiFe setting..

Peter Christy19/03/2019 08:55:21
1547 forum posts

Yes, A123 are LiFe. LiFe is a generic name. A123 is (IIRC) the name of the manufacturer who first offered them commercially - a bit like "vacuum cleaner" and "Hoover". wink

--

Pete

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