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HomeAircraftHelicopterBeginners Corner › DX7 TX & RX battery
03-31-2009 06:13 PM  9 years agoPost 1
WyDiablo

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N. Little Rock, Ark, USA

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I have a new DX7 and reciever pack that I"m charging. After its hase completely charged does the 2 red lights go out or do they stay on? The batteries have been on the charger for a good 16 hours. I was just wondering if the charger gave any indication as to when it had finished charging.

WyDiabo

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03-31-2009 06:28 PM  9 years agoPost 2
BarracudaHockey

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Jacksonville FL

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Nope, wall wart chargers arent very smart, they just charge at a constant rate till you disconnect them, the lights don't go out or anything.

Andy
AMA 77227
http://www.jaxrc.com

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03-31-2009 07:10 PM  9 years agoPost 3
WyDiablo

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N. Little Rock, Ark, USA

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LOL Is that a wal-mart chager that came with the "new" Dx7 radio? Wow and I thought that it as a "Spektrum" charger LOL. But that sounds about right for a "wally World" product.

WyDiablo

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03-31-2009 09:23 PM  9 years agoPost 4
BarracudaHockey

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Jacksonville FL

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Nah, those "dumb" chargers have been refered to as wall wart's for years.

Andy
AMA 77227
http://www.jaxrc.com

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04-01-2009 05:27 AM  9 years agoPost 5
mchammer

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California,USA

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I would say that after 16 hours your pack is probably charged if not overcharged.

Peace Through Superior Firepower!!!

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04-01-2009 11:01 PM  9 years agoPost 6
gftazz

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upstate N.Y. in the Adirondacks

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No that DX7 transmitter battery is a 1500 MA nickelmetalhydride and that wall wart charger that comes with the DX7 and SE is only a 50MA charger so on the first time you charge it's reccommended that you devide 1500 by 50 = 3 so you need to leave it charging for 3 days till that battery is GOOD and FULLY charged. It has to do with they are NMHI batts and need to be charged this way the first time to wake them up or some internal resistance such thing but not NICADS.

I just went through it again with my new DX7SE and had to do it with my original DX7 the battery reading on the transmitter read 11.4v or so after I got done at 3 days and 2 nights. My friend ruined his first battery in his DX7 because he only left it charging one 24 hr period and it says it's charged but is a false reading as it drained in less than a day of use where as mine lasts for days or weeks depending on how much/often I get to fly. He got a new trans batt as his had built an internal short they said and he charged it for 3 days like I told him I had read on here too do and he never had a problem after that.

I read it on here so do a RR search about it. Now I either leave it charging till I get a good 11.3-4 or so reading with the wall wart charger pluged in as long as necessary to get there or I quick charge it on a Hobbico charger that has delta peak detection and only charges it at 800 MA so I can do it at the field in an hour or so if I have/want to, when it gets done it reads like 11.8-9V on the radio.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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04-02-2009 02:50 AM  9 years agoPost 7
mchammer

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California,USA

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man I could have swore it was a 100mah charger. sold mine so I cant look.

Peace Through Superior Firepower!!!

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04-02-2009 08:35 PM  9 years agoPost 8
WyDiablo

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N. Little Rock, Ark, USA

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The charger that came with my DX7 says that it will charge my rx & tx at 110Ma at the same time.

Thanks
WyDiablo

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04-02-2009 08:46 PM  9 years agoPost 9
gftazz

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upstate N.Y. in the Adirondacks

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I have the charger that comes with my DX7SE right here in my hand and it is a Spektrum SPM7101 NI-Cd wall charger and it says right on it OUTPUT TX 11.6V 50MA, RX 5.8V 50MA.
So the TRANS. battery should charge to around 11.6V at 50 miliamp and the Receiver 1100MA Spektrum Battery should charge to around 5.8V (which a 4cell pack will be when fully charged) at 50MA with this wall charger. Devide the batteries MA rating and devide by the charge rate (50MA) and you'll get about how long it takes to fully charge up.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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04-02-2009 09:04 PM  9 years agoPost 10
WyDiablo

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N. Little Rock, Ark, USA

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Why does in instruction manual say 110 Ma?
I have not looked at the charger itself to see what it says.

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04-02-2009 09:33 PM  9 years agoPost 11
Saint728

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Honolulu, Hawaii

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No that DX7 transmitter battery is a 1500 MA nickelmetalhydride and that wall wart charger that comes with the DX7 and SE is only a 50MA charger so on the first time you charge it's reccommended that you devide 1500 by 50 = 3 so you need to leave it charging for 3 days till that battery is GOOD and FULLY charged.
If it is a 1500ma battery and your charger charges it at 50ma then it will take 30 hours to charge not 3 days. 1500 ÷ 50 = 30

Take Care,
Cheers, Patrick

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04-02-2009 11:52 PM  9 years agoPost 12
WyDiablo

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N. Little Rock, Ark, USA

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OK guys here is the charger info on the one that came with my DX7 radio.

Type:Wall Charger
Input:100 - 120VAC
# Cells:TX: 8 / RX: 4
Charge Rate:110mA
Battery Type:Ni-MH and Ni-CD

So going by this charger info it should only take 13.6 hours correct?

Thanks
WyDiablo

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04-03-2009 12:41 AM  9 years agoPost 13
Saint728

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Honolulu, Hawaii

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Yes that is correct if your battery pack is completely flat.

Take Care,
Cheers, Patrick

Check the hotties in my Gallery
http://rc.runryder.com/helicopter/gallery/9019/?all=photo

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04-03-2009 03:23 AM  9 years agoPost 14
mchammer

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California,USA

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looks like the dx7 or dx7se have different wall chargers.

Peace Through Superior Firepower!!!

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04-03-2009 03:33 AM  9 years agoPost 15
gftazz

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upstate N.Y. in the Adirondacks

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Are you reading that info from the instruction manual or right off the wall charger itself like I did. If not from the wall charger itself then please look right at the wall charger and please tell us what it says on it because I can't imagine that there is different chargers being shipped as this is my second DX7 radio, granted it's the SE version this time but the wall chargers are exactly the same and both say right on them 50MA charge rates for TX and RX so please check your actual charger. My friends DX7 wall charger is the same as mine too.

Yes Patrick you are correct on the math but when I got my first DX7 after they had been out for a while people on here were saying because of the low charge rate to leave the NIMH trans batt plugged in for 3 days to get it fully charged the first time due to it being a NIMH type battery and or the low charge voltage of the wall charger???? So I did it.
My firend didn't and his TX batt crapped out shortly in a couple of uses so they Horizon sent him a new one and said his had developed an internal problem so it wouldn't charge up. My first DX7 TX batt is going on 2 years old now with NO trouble.

Oh No Someone Please Stop Me Before I Go Broke With This Heli Thing!!

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04-03-2009 11:30 AM  9 years agoPost 16
Eagle2bravo

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Out flying somewhere

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Yeah, I have the stock DX-7 batt. also....3 years old and never a problem. It's a cheap wall charger but if used right works flawless. I get 4 days of flying as long as I remember to shut it off when not in use

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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04-03-2009 11:36 AM  9 years agoPost 17
TOSH

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UK.Peterborough

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Eagle2bravo

Where did you buy a DX7 three years ago?

Flybars. Who needs `em.

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04-03-2009 12:21 PM  9 years agoPost 18
Eagle2bravo

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Out flying somewhere

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Local hobby store.

T-rex 600n super pro , Trex 450 se, Gaui 200, Trex 500, Blade cx, . "If ya plant corn, ya get c

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04-03-2009 12:22 PM  9 years agoPost 19
WyDiablo

rrNovice

N. Little Rock, Ark, USA

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I'm reading the lable thats on the wall charger itself. It is a SPM9522 wall charger. And it does chager at 110Ma.

Thanks
WyDiablo

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04-03-2009 12:25 PM  9 years agoPost 20
TOSH

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UK.Peterborough

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Didn`t think they were in the shops three years ago

Flybars. Who needs `em.

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