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Cullen Colapietro · 10-05-2008, 03:40 PM

Hello all, I am new to heli's but not to rc. I am having a problem with my bmcx charger. When I insert the battery, the red charging light comes on as anticipated. However, after 1 hour charge time, the light is still on and the battery has no charge. I have lipos and have tested them all, so it's not the battery. I'm frustrated because this heli is great!

I took the issue to my LHS and the owner replaced my charger. I returned home with the new charger and to my dismay, I had the same issue. I've tried freshly charged 2500mAh AA's as well with the same issue. Should I buy new alkalines? I only have 8 or so charges on the cells included with the heli.

Any ideas?

estone · 10-05-2008, 04:21 PM

id try alcalines the individual cell voltage is higher it would be 1.2v higher than rechargeables. the batts that came with me only made it about 4-5 charges then it did the same thing as yours.the alcs they send are junk u should be able to get 15-20 charges per set

Cullen Colapietro · 10-05-2008, 04:22 PM

Thanks, I'll go buy some fresh batteries.

Cullen Colapietro · 10-05-2008, 07:20 PM

Feeling a little stupid, the new batteries did the trick. I should have thought of that, thanks. I just assumed since the rechargeables did the same thing that it was the charger. I have tried freshly recharged batteries and they will charge the mcx lipos. We'll see how many times.

estone · 10-05-2008, 10:01 PM

ur rechargeables might be getting weak, i just tried some duracell 2500s and they work in mine we'll see for how many charges

hfReader · 10-06-2008, 05:59 PM

Got my mCX today and tried to charge using NiMH cells.
Although I charged the NiMHs before, charging never
completed (waited more than one hour).

So I disassembled the E-Flite charger:

- remove the 4 sticky rubber pads at the bottom
- remove the 4 screws
- remove the 2 screws of the charging jack
- cut off the black and red wires at the jack
- solder new wires to the jack

and crafted my own recharger cable.

When charging with 100 mA it will take 1 hour.
So I increased charging current to to 200 mA (ca. 2C)
yielding 20-30 min charging time.

5 cycles without problems so far.

Btw the mCX is a great improvement
compared to the bigger coax helicopters:

No TBE, minimal yaw axis drift, precise steering,
rock solid hover, weather independent indoor flying :-)

DaddyDan · 10-14-2008, 05:40 PM

awesome idea! i was thinking at making a 5v powersuply with a protoboard, you idea is much easier!!
i hate the fact that i can't use my nimh 2700mah for more than 4-5 charges since they are only 1.2v even if they are in good shape, after 4 or 6 charges the voltage gets too low (1.2 is too low for the charger)

10-05-2008, 03:40 PM	#1 (permalink)
Cullen Colapietro Registered Users Join Date: Oct 2008	HELP can't charge my new blade mcx Hello all, I am new to heli's but not to rc. I am having a problem with my bmcx charger. When I insert the battery, the red charging light comes on as anticipated. However, after 1 hour charge time, the light is still on and the battery has no charge. I have lipos and have tested them all, so it's not the battery. I'm frustrated because this heli is great! I took the issue to my LHS and the owner replaced my charger. I returned home with the new charger and to my dismay, I had the same issue. I've tried freshly charged 2500mAh AA's as well with the same issue. Should I buy new alkalines? I only have 8 or so charges on the cells included with the heli. Any ideas?

10-05-2008, 04:21 PM	#2 (permalink)
estone Registered Users Join Date: Feb 2008	id try alcalines the individual cell voltage is higher it would be 1.2v higher than rechargeables. the batts that came with me only made it about 4-5 charges then it did the same thing as yours.the alcs they send are junk u should be able to get 15-20 charges per set __________________ cp+ retired, cx2, trex 450, trex600e, numerous foamies

10-05-2008, 10:01 PM	#5 (permalink)
estone Registered Users Join Date: Feb 2008	ur rechargeables might be getting weak, i just tried some duracell 2500s and they work in mine we'll see for how many charges __________________ cp+ retired, cx2, trex 450, trex600e, numerous foamies

10-06-2008, 05:59 PM	#6 (permalink)
hfReader Registered Users Join Date: Jul 2007	Charging revisited Got my mCX today and tried to charge using NiMH cells. Although I charged the NiMHs before, charging never completed (waited more than one hour). So I disassembled the E-Flite charger: - remove the 4 sticky rubber pads at the bottom - remove the 4 screws - remove the 2 screws of the charging jack - cut off the black and red wires at the jack - solder new wires to the jack and crafted my own recharger cable. When charging with 100 mA it will take 1 hour. So I increased charging current to to 200 mA (ca. 2C) yielding 20-30 min charging time. 5 cycles without problems so far. Btw the mCX is a great improvement compared to the bigger coax helicopters: No TBE, minimal yaw axis drift, precise steering, rock solid hover, weather independent indoor flying :-) Attached Thumbnails

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10-05-2008, 04:22 PM	#3 (permalink)
Cullen Colapietro Registered Users Thread Starter Join Date: Oct 2008	Thanks, I'll go buy some fresh batteries.

10-05-2008, 07:20 PM	#4 (permalink)
Cullen Colapietro Registered Users Thread Starter Join Date: Oct 2008	Feeling a little stupid, the new batteries did the trick. I should have thought of that, thanks. I just assumed since the rechargeables did the same thing that it was the charger. I have tried freshly recharged batteries and they will charge the mcx lipos. We'll see how many times.

10-14-2008, 05:40 PM	#7 (permalink)
DaddyDan Registered Users Join Date: Feb 2008	awesome idea! i was thinking at making a 5v powersuply with a protoboard, you idea is much easier!! i hate the fact that i can't use my nimh 2700mah for more than 4-5 charges since they are only 1.2v even if they are in good shape, after 4 or 6 charges the voltage gets too low (1.2 is too low for the charger)

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