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HelicopterRadio - Spektrum DSM › DX7 battery options
12-29-2010 07:07 AM  6 years agoPost 1
drifter88

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Upstate NY

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Time for a new battery for my DX7. Any suggestions? Thanks

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12-29-2010 08:37 AM  6 years agoPost 2
Heli Davey

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springfield,mass

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I would go with this one!!!

http://www.readyheli.com/HP-FT21003...ck_p_33836.html

*TREX 500ESP*TREX 600NSP*TREX 700N LE*

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12-29-2010 09:15 AM  6 years agoPost 3
EmmDee

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Seattle, WA

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+1 on Heli Davey's reply. I've been using this pack for the DX-7 for a while and it is fantastic. Fly all day and the next without charging the TX.

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12-29-2010 05:36 PM  6 years agoPost 4
greger

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Mesa, AZ

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I got a LIPO on ebay for $12 shipped.. works great

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12-29-2010 05:36 PM  6 years agoPost 5
AtTheCross

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Southern CA

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looks good any other options/suggestions? i'm in the market for a dx7 battery as well

ASI Green Mongoose CY29RC - 67 flights

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01-07-2011 02:32 PM  6 years agoPost 6
kruuuzn

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Traverse City, MI

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Is this plug-and-play in the Dx7?

The website says "transmitter connectors sold separately". Do you need to change any connectors?

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01-07-2011 05:24 PM  6 years agoPost 7
EmmDee

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Seattle, WA

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You would need to order this connector for JR/Spectrum:

http://www.readyheli.com/HP-FCBL-2E...or_p_33831.html

And this one for Futaba/standard servo plug style radios:

http://www.readyheli.com/HP-FCBL-3S...or_p_33832.html

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01-07-2011 06:03 PM  6 years agoPost 8
drifter88

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Upstate NY

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Thanks EmmDee Battery is ordered.

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01-08-2011 02:30 AM  6 years agoPost 9
rumbleweed

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Maryland=USA

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+1 to Heli Davey I have been using one for about a year and a half and love it. You will need the adapter and you must have a charger capable to charge A123 3 cell LiPo. Do not charge with radio charger. Best part is with a good charger, you can fully charge in about 15-20 mins.

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01-08-2011 03:08 AM  6 years agoPost 10
smedley

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Grand Rapids, MI.

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Charging.

The web site first says:

LiFePO4 batteries can be charged as A123 batteries on most chargers.

Then right below it says:

Includes Safety PCM circuits to allow charging inside Transmitter, using standard wall NiMH charger.

I guess you can charge it both ways? And what is an "A123 battery"?

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01-08-2011 03:18 AM  6 years agoPost 11
drifter88

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Upstate NY

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Why can't you charge it with the radio's charger?

Absolute Max charge rate is 4.8A, as this is the rating of the PCM safety chips used inside the packs. Still this is quite a high charge rate, and allows recharge in 30-45 minutes, typically.
The PCM device protects the pack from over-voltage charging. It also allows the pack to remain installed in the transmitter, and then be charged with the standard NiCd or NiMH wall-charger which comes with most transmitters.
(wall chargers up to 12V max for 3S packs, or 8V for 2S are usable)
- HP-FG305-1600-3S is a replacement for any transmitter which uses 8-cell NiMH in a "flat" arrangement
- HP-FG305-2080-2S is a replacement for CAR Tx (or any) which use 5-cell NiMH "flat" packs, such as Futaba 4PK Pistol grip Tx.
- HP-FG305-2100-3S is a replacement for any transmitter which uses 8-cell NiMH in a 2x2x2 "block" arrangement.

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01-08-2011 03:22 AM  6 years agoPost 12
smedley

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Grand Rapids, MI.

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It claims you can.
That would be convenient eh?

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01-08-2011 01:31 PM  6 years agoPost 13
rumbleweed

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Maryland=USA

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If the pack is in great shape, probably work OK charging in Tnx. As it gets older, the cells will get out of balance ( no balancer built in) then you can run into problems. A123 cells are safer than LiPos but still not totally safe. Once you see what a battery fire can do, you will not charge in a radio or model again. I have a friend who is an insurance fire investigator and you would be surprised how many houses are destroyed charging Kid's toy helis and planes with 200 MaH 1S LiPos.

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01-08-2011 04:30 PM  6 years agoPost 14
onewasp

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USA

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Quote: "...A123 cells are safer than LiPos but still not totally safe."

Explain please, as I believe you are rather badly mistaken.
A123 is safe, safe, safe ! As safe as any couple I can think of.

Just how is it not safe ?

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01-09-2011 07:37 AM  6 years agoPost 15
gixxernoob

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fairfax, va

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I just got the 2100mah Hyperion-LiFePO4 today from ReadyHeli and hook it up on my tp1010 and 210v balancer. After 20min or so it charged about 794mah back into the LifePO and read 10.95v via a123 setting. However after that it gave an error that it was imbalance and the charger stop. Anybody had this same experience? I know when those batteries are shipped particularly Lipos they are 50% charged and was wondering how it can be fully charged when it automatically stops bec. of the error.


M's Ichiro (51)

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01-09-2011 04:12 PM  6 years agoPost 16
Crashr30

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DFW

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Smae Thing

Gixxernoob

I had this nightmare as well and I worked on this for hours trying to figure out why 1) I could not charge the pack as my Hyperion charger would give me output battery connection error (not exact language) and 2)the pack would not balance with the balancer, I would get a balancer error. I actually had 3 LiFe Hyperion packs do this.

The problem is that if you check the volatage of each cell with a DVOM at the balance lead you will most likely find one cell that is like 3.9v and the other two will be at about 3.5. The volatage imbalance I think is the problem.

I fixed mine by rewiring the balance conncetor to the JST connector format. Go to http://sites.google.com/site/tjingu...ance-connectors and this will show you how to wire it as a JST format connector. Use your JST balance board (if you have one) and see if it works. I hope it does. By the way this link was suggested by another member on the board here but I do not remember who, so thanks to whomever that may be.

I can say this worked for me. With what I thought I had 3 bad packs that are now all fine. I tried multiple chargers and a couple of balancers and they would not work until I did this. I did a search on this subject on Google and found several people with the issue but no solutions.

So try this and see if it works for you. Not sure what the difference is but I can say that on the Hyperion the balancer did not see cell 1 but saw cells 2,3,4. So I am guessing that somehow in the LiFe programming or such that it must see cell 1 to work correctly. With the way the hyperion is wired on these smaller packs it does not see cell 1. Good luck

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01-10-2011 01:14 AM  6 years agoPost 17
gixxernoob

rrApprentice

fairfax, va

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Crashr30

I thought I was the only one experiencing the LifePo battery issues i.e. each cell has different voltage readings. Since quite a few people are having the same issues I don't get why they are not posting any fixes for these and they are just letting people buy it without a warning. I wonder what the long term issues are if they don't do any preventive maintenance i.e. proper balancing of cells? Btw thank you for the link I will definitely read and check it out.


M's Ichiro (51)

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01-12-2011 12:19 PM  6 years agoPost 18
Switch_639

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Port Elizabeth,​South-Africa

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i use this http://www.hobbycity.com/hobbycity/...ter_Lipoly_Pack no problem what so ever... been using it over a year now... I fly only once a week on a Sunday for about 4hours... I charge it once every 2months... it has the correct plug and fits in perfectly...

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