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HomeRC & PowerAircraftHelicopterRadio - Spektrum DSM › Evo-Tx in DSX9
02-05-2008 07:24 PM  10 years agoPost 1
robhurlin

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Pretoria, South Africa

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I have just bought a JR DSX9. I don't like NiMh batteries because of their high self discharge rate, so I traded in the 1500 mAh NiMh battery that comes with the DSX9 and bought an Evo-Tx Spektrum for it.

The instructions for the DSX9 specifically say you can't use a 3s Lipo. They say the power regulating transistor can be overloaded causing damage or failure (possibly in flight) by voltages of 12.6V. My fully charged Evo-Tx reads 12.4V on the screen, so, is it safe or not??

The Evo-Tx is specified at 11.1V but still delivers 12.4 in the Tx when fully charged, like a normal 3s lipo would. The Flightpower website (http://www.flightpower.co.uk/) says the Evo-Tx is fully compatible with the DX6, DX7 and JR radios and is a plug and play replacement for the standard pack. I thought it would have an 11.1 V regulator in it but it doesn't seem to as it still puts out typical Lipo voltages. Strangely enough I couldn't pull more than 0.47A from it when discharging with my Sparrow charger which was set to discharge at 1A.

So, is it safe, is the JR guarantee voided by its use??

Rob.

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02-05-2008 07:31 PM  10 years agoPost 2
AAKEE

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Boden, Sweden

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I dont know about the possibility ov overload and failure int flight, but a 3s lipo should hold 12.6volts when fully charged (4.20volt per cell).

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02-05-2008 07:39 PM  10 years agoPost 3
robhurlin

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Pretoria, South Africa

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It probably dropping to 12.4v because of the load being pulled by the Tx.

I see some of these issues are discussed here:
http://runryder.com/t399648p1/?top=1202241087

Rob.

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02-06-2008 01:50 AM  10 years agoPost 4
village_idiot

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Land of confusion

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Horizon says that it will not be covered under warranty. Might be different for you though. One thing to note, a couple of people have reported that an 8 AA battery holder fits, so it makes a lot of sense to go with the low self discharge Nimh AA cells that are on the market. No problems with the warranty, no problems fitting new cells, no problems charging the new cells several different ways. When the springs in the holder finally get loose, buy another holder for a few dollars and replace it.

That said, some people just have to put a LiPo in.

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02-14-2008 08:14 AM  10 years agoPost 5
Griffo

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Melbourne / Canberra, Australia

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I just use eneloop batteries. Much lower self discharge rate than ordinary NiMH and come in 2000Mah packs.

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02-14-2008 08:32 AM  10 years agoPost 6
Toolman

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London

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Would it be possible to use a tail servo Volt drop diode to lower the Lipo voltage slightly?

Tim.

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02-14-2008 09:35 AM  10 years agoPost 7
robhurlin

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Pretoria, South Africa

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I wouldn't trust the connections on an 8xAA holder. Small bumps with a bit of corrosion on the terminals and you have a serious glitch! Solid joints all the way!

Rob.

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02-15-2008 04:45 AM  10 years agoPost 8
rwmcknight

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Albuquerque, New Mexico

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JR sells a 2500mah battery that replaces the 1500mah stock battery. That should take care of the issue with installing a modified battery to extend flight time between charges.

http://www.jrradios.com/Products/De...ProdID=JRPB5011

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02-15-2008 04:16 PM  10 years agoPost 9
midwestpilot

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Crystal Lake, IL

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see...
someone comes on here at takes all the fun away by making sense!

Get a JR larger pack... bloody genius.

now me.. I am going with a marine wet cell on the ground with cables coming up to the radio and plugging into the stock location.. this way I can fly non stop for a year with out charging...hmmmm or.. I could go with the option above...

In life there is no spacebar!

Rich Erikson AMA 6175

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02-15-2008 04:40 PM  10 years agoPost 10
nivlek

rrProfessor

Norfolk England

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I don't like NiMh batteries because of their high self discharge rate,
Modern nimh cells are much better than they use to be . I left the 3000 mAH nimh receiver pack in my Raptor 50 fully charged at the end of October . I cycled it yesterday and it still had over 2900 mAh in it !

At the end of the day , it gets dark .

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02-15-2008 06:59 PM  10 years agoPost 11
robhurlin

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Pretoria, South Africa

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That's excellent! Are they all like that or just specific brands?

Rob.

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02-15-2008 07:12 PM  10 years agoPost 12
nivlek

rrProfessor

Norfolk England

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I've no idea , but it wasn't an expensive pack , I think that it is made up from GP cells .

At the end of the day , it gets dark .

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02-15-2008 07:32 PM  10 years agoPost 13
robhurlin

rrKey Veteran

Pretoria, South Africa

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The only low self discharge cells I have found locally are the MaxE cells made by Ansmann (2100 mAh for AA size). They are specifically marketed as low self-discharge. All the other cells typically available in camera shops (including GP) are the standard high self-discharge chemistry. Presumably for the model trade we are getting higher quality batteries. I'll ask around.

The guys at my LHS say the JR NiMHs that come with the radios are good but still have noticeable self-discharge. They also used the best available C size NiMHs (2 x 6 packs @ 3400 mAh) in their starter and only get an afternoons worth of starting. If they don't charge fully each week they are toast. I bought ordinary NiCd 1900mAh packs from them for my starter and charge once a month, but even that isn't really necessary.

Whatever works for you as long as you know how it behaves!

Rob.

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02-15-2008 11:48 PM  10 years agoPost 14
nivlek

rrProfessor

Norfolk England

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Have a look for Sanyo "Eneloop" cells . They look to be the dogs danglies.

At the end of the day , it gets dark .

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02-16-2008 12:10 AM  10 years agoPost 15
robhurlin

rrKey Veteran

Pretoria, South Africa

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Oh, SANYO "Eneloop" OK, I'll ask if they are available here. BTW, can they also handle higher currents without loosing a lot of capacity?

I wonder what "Eneloop" means? In Afrikaans it means, "one walk." Maybe because you only charge it once and then not again before flying .

Rob.

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