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VPX!! Possible new type of transmitter Battery

Old 10-19-2008, 07:58 AM
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fockewulf37
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Default VPX!! Possible new type of transmitter Battery



I know ya'll have all heard of the A123 batteries. Well I had not messed with the VPX batteries until the other day when I saw them on closeout at Walmart. It just happened that my brandnew 9303 2.4 transmitter about 8 months old battery went bad... I am needing a replacementfor it and a decent nicad pack is about $40 -50. Well A123 batteries are 3.2-3.7 volts each when charged and under load drops to about 3.3 and stays there for a very long time. I figured I wold try a 3 pack of the 1150 mah A123 batteries that are in the VPX battery. I had to buy 2 of the VPX batteries. I tokk them apart and then soildered so there were 3 in series. I am able to get them in the back of the radio with 1 small mod to the back compartment.

To test it out I took an older transmitter and placed it on the table on and with a timer running..The pack started out at 10v and stayed there for about 1 hour. then it dropped to 9.9 V and stayed there for about 4 hours .. Any way I am at 7 hours and the voltage has only dropped to 9.7 volts.
The great thing about the A123 batteries I can charge this whole pack in about 15 minutes if it gets low.....

Ty
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Old 10-19-2008, 09:23 AM
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BuschBarber
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Default RE: VPX!! Possible new type of transmitter Battery

Make sure you extend one link on the antenna when you leave it on for that long or you will burn out the RF module. You can take out the RF module or plug a 1/8th inch mono jack, from Radio Shack, into the Trainer jack on the back of the Tx. That will power up the radio without sending power to the RF module (be sure the Tx switch is off).

Of course since the Tx only uses 1/4 of the current it would if the RF was powered up, it will take longer to drain the battery.
Old 10-19-2008, 10:41 AM
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AWorrest
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Default RE: VPX!! Possible new type of transmitter Battery

I am using the M1 A123 as a flight pack. These cells have a flatter discharge curve than a LiPo. They will hold their voltage until they quit abruptly. Since VPX is using the same chemistry as the M1 A123, they should act the same. One shouldn't depend on a voltage measuring device to predict the amount of capacity left unless it has a very high resolution. You better note the time it takes to go from 9.6 volts to zero!

Allan
Old 10-19-2008, 01:02 PM
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fockewulf37
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Default RE: VPX!! Possible new type of transmitter Battery

Allan,
I understand what you are saying. The whole reason I ran the test to see how long it would go before the sudden drop off. The great thing about these batteries is I can top them off in just a few minutes.. I do not fly for seven hours over one weekend. Someone that does fly that much may have to keep a better watch on the batteries... I just thought i would throw this out there as another option for a radio battery....

Ty
Old 03-23-2009, 05:30 AM
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fockewulf37
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Default RE: VPX!! Possible new type of transmitter Battery

Hey guys, Just an update. I am still useing the A123's for my transmitter pack. I am only on my second charge since October... I don't fly alot but I do use the radio allot in the shop setting up planes... I am getting about 7 hours+ per charge.......

Ty
Old 03-23-2009, 08:20 AM
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MR G
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Default RE: VPX!! Possible new type of transmitter Battery

fockewulf37,

Can you explain more about the mods required to get the batteries into the TX??

Thanks,

MR G
Old 03-24-2009, 08:15 AM
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tkilwein
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Default RE: VPX!! Possible new type of transmitter Battery

I only get ~800-900mah out of my vpx packs, they are the 1100mah packs.
Would not last that long for me.
Old 03-24-2009, 08:32 AM
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Default RE: VPX!! Possible new type of transmitter Battery

I got about 1150mah when mine were new...now after a year they are holding about 1000mah.

Kevin

P.S. Using the packs in mini cars with a much higher drain than a radio.....
Old 04-02-2009, 08:13 PM
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bubba 9999
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Default RE: VPX!! Possible new type of transmitter Battery

I pick up about 5 of these at wallmart for $12.00 ea. I was considering getting a A123 2300mah pack for my recvr in my big plane, is it possible to put four of these (VPX)cells together in parallel and still have the 6.6v but 2200mah? also if that would work, how would you wire it for balance charging. Britt
Old 04-03-2009, 12:17 AM
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dirtybird
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Default RE: VPX!! Possible new type of transmitter Battery

Two packs in parallel should work just fine but then you would probably be better off with the M1 cells. To balance charge, separate the two packs.
Old 04-04-2009, 12:35 AM
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Default RE: VPX!! Possible new type of transmitter Battery

Think I'm going to try it, after a little investigating by taking off the cardboard tube on the outside, I can see lots of numbers, then the obvious A123 then also the designation M1.
Old 04-04-2009, 01:57 AM
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Default RE: VPX!! Possible new type of transmitter Battery

Notice there's a diode in the balance lead. Remove the whole balance lead wire from the pack and solder in a new wire.

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