RCCrawler Forums

tylinens69 · 10-18-2009, 03:31 PM

I recently bought a intelect 4200 mah (ni-mh) battery off of ebay, i put a traxxas plug on it and charged it on my charger and it stopped charging at half so i plugged it in again and when it finished charging i put it in my truck and when i drove it it seemed extremely sluggish. it only lasted like 4 minutes and died to where it would not drive anymore. what is wrong with it? what do i need to do to get its full potential back?

chevellian · 10-18-2009, 03:49 PM

6 cell?
check voltage, could be a bad cell.

tylinens69 · 10-18-2009, 03:53 PM

thanks ill check it.

ultimate_monkey · 10-18-2009, 03:56 PM

some batterys you have to charge / discharge a few cycles befor they will come up to full capacity. how many runs cycles have u put it threw?

but x2 on checking the voltage

tylinens69 · 10-18-2009, 04:02 PM

i have only cycled it about 3 times on a dynamite vision peak 2 while i have had it.

ultimate_monkey · 10-18-2009, 04:07 PM

after re-reading your first post its probably a bad cell, you said the truck seemed "slugish" but mah weather it be 800 or 5000 wouldnt have anny effect on speed. that comes from the voltage.

tylinens69 · 10-18-2009, 04:12 PM

what do i do to fix this?

big guy · 10-18-2009, 04:32 PM

i'm not familiar with your charger, but try setting it for 1 amp. charge it for 20 min. then you can bump it up to 4 amps to finish the charge. i did that when i had a battery that did not want to take a charge.

hope this helps.

ultimate_monkey · 10-18-2009, 05:01 PM

Quote:

Originally Posted by tylinens69

what do i do to fix this?

if it is a bad cell (you have to check with a volt meter to be sure) basically the only thing u can do is take the battery apart and replace the cell with a new one with the same brand and mah rateing

tylinens69 · 10-19-2009, 05:46 AM

well i checked it last night and its a 7.2v putting out 8.5v. is this bad? what do i do?

clockworks · 10-19-2009, 08:25 AM

I've had several packs with bad cells. The voltage measures OK off-load, but drops down to about 5 or 6v under load (while actually driving).

I got fed up with messing about with NiMH. Binned the lot and switched to LiPo.

rhett314 · 10-19-2009, 08:51 AM

I have been burned with ebay batteries before. I bought some 3800's once, and noticed that they had bad run times. I cut them open and found that they where only 1500's. So, if your batteries are the kind where you can't see the cells you may have beened burned also.

2500hdon37s · 10-19-2009, 08:52 AM

run it down in your rig then hook like a smal esc fun on it then let that run it all the way down to wher it wont even trun on the fan and then charge at lowest amp setting or 1 amp max

squatch71 · 10-19-2009, 10:53 AM

don't mess with it....send it back, I would say its a bad cell, will go to crap on you underload....its new, send her back to the place you got it.

KBrog · 10-19-2009, 11:13 AM

If its not a dead cell, then check your charger to make sure it is set for NiMH. I have a few NiMH's, and my charger was set for Ni-CD. The NiMH would charge, but never to full and would run out fast. Once I figured out I was charging it wrong, I changed the setting on my charger and it was like having a brand new battery again.

chevellian · 10-19-2009, 05:35 PM

Quote:

Originally Posted by squatch71

don't mess with it....send it back, I would say its a bad cell, will go to crap on you underload....its new, send her back to the place you got it.

X2, hopefully the vendor will take care of you, one good reason to deal with the vendors here on rcc.

If you have a temp gun, check the individual cells while charging or discharging, if you have a bad cell it will be hotter than the others.

tylinens69 · 10-19-2009, 06:37 PM

im not gonna worry about sending it back because to make a long story short i have delt with this guy before on a lipo and found it to be the wrong amount of cells so i sent it back and got my money back minus return shipping. he helped me out by giving me more than what he owed me for the returned shipping amount off of my purchase. he isnt a bad guy he just deals alot of rc stuff. so im not going to worry about it and ill just cycle it and run it till she pukes. o and it is for sure a 4200 mah battery it is in a clear package.

Killer RC · 10-20-2009, 06:41 AM

What is the Delta Peak set at on your charger? If the Delta Peak is set too low then your charger will get a false reading and think that the pack fully is charged when it really isnt. Raise the delta peak to about 12mv and then try charging it.

tylinens69 · 10-20-2009, 05:58 PM

all is good i let it trickle all last night a day. she runs great now i think it was just setting too long. thanks for all the advice.

squatch71 · 10-20-2009, 08:00 PM

wow, learned something today...I remember the nicads doing that...didn't think the nimhs doing that...interesting...sorry for jumping the gun and saying return it....

10-18-2009, 03:31 PM	#1
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	Battery with low run times. its supposed to be a 4200 mah but it runs like a 1500 mah I recently bought a intelect 4200 mah (ni-mh) battery off of ebay, i put a traxxas plug on it and charged it on my charger and it stopped charging at half so i plugged it in again and when it finished charging i put it in my truck and when i drove it it seemed extremely sluggish. it only lasted like 4 minutes and died to where it would not drive anymore. what is wrong with it? what do i need to do to get its full potential back?

10-18-2009, 04:32 PM	#8
big guy Newbie Join Date: Feb 2009 Location: moncton Posts: 3	battery i'm not familiar with your charger, but try setting it for 1 amp. charge it for 20 min. then you can bump it up to 4 amps to finish the charge. i did that when i had a battery that did not want to take a charge. hope this helps.

10-18-2009, 03:49 PM	#2
chevellian Rock Crawler Join Date: Sep 2006 Location: Lititz Posts: 787	6 cell? check voltage, could be a bad cell.

10-18-2009, 03:53 PM	#3
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	thanks ill check it.

10-18-2009, 03:56 PM	#4
ultimate_monkey Rock Crawler Join Date: Mar 2009 Location: Victoria BC Posts: 988	some batterys you have to charge / discharge a few cycles befor they will come up to full capacity. how many runs cycles have u put it threw? but x2 on checking the voltage

10-18-2009, 04:02 PM	#5
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	i have only cycled it about 3 times on a dynamite vision peak 2 while i have had it.

10-18-2009, 04:07 PM	#6
ultimate_monkey Rock Crawler Join Date: Mar 2009 Location: Victoria BC Posts: 988	after re-reading your first post its probably a bad cell, you said the truck seemed "slugish" but mah weather it be 800 or 5000 wouldnt have anny effect on speed. that comes from the voltage.

10-18-2009, 04:12 PM	#7
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	what do i do to fix this?

10-19-2009, 05:46 AM	#10
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	well i checked it last night and its a 7.2v putting out 8.5v. is this bad? what do i do?

10-19-2009, 08:25 AM	#11
clockworks Rock Crawler Join Date: Feb 2008 Location: UK Posts: 818	I've had several packs with bad cells. The voltage measures OK off-load, but drops down to about 5 or 6v under load (while actually driving). I got fed up with messing about with NiMH. Binned the lot and switched to LiPo.

10-19-2009, 08:51 AM	#12
rhett314 Rock Crawler Join Date: Oct 2006 Location: Fernley Posts: 870	I have been burned with ebay batteries before. I bought some 3800's once, and noticed that they had bad run times. I cut them open and found that they where only 1500's. So, if your batteries are the kind where you can't see the cells you may have beened burned also.

10-19-2009, 08:52 AM	#13
2500hdon37s I wanna be Dave Join Date: Mar 2009 Location: sittin in the sky Posts: 4,630	run it down in your rig then hook like a smal esc fun on it then let that run it all the way down to wher it wont even trun on the fan and then charge at lowest amp setting or 1 amp max

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10-19-2009, 10:53 AM	#14
squatch71 I wanna be Dave Join Date: Sep 2008 Location: four o six Posts: 2,101	don't mess with it....send it back, I would say its a bad cell, will go to crap on you underload....its new, send her back to the place you got it.

10-19-2009, 11:13 AM	#15
KBrog RCC Addict Join Date: Aug 2009 Location: Earth? Posts: 1,698	If its not a dead cell, then check your charger to make sure it is set for NiMH. I have a few NiMH's, and my charger was set for Ni-CD. The NiMH would charge, but never to full and would run out fast. Once I figured out I was charging it wrong, I changed the setting on my charger and it was like having a brand new battery again.

10-19-2009, 06:37 PM	#17
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	im not gonna worry about sending it back because to make a long story short i have delt with this guy before on a lipo and found it to be the wrong amount of cells so i sent it back and got my money back minus return shipping. he helped me out by giving me more than what he owed me for the returned shipping amount off of my purchase. he isnt a bad guy he just deals alot of rc stuff. so im not going to worry about it and ill just cycle it and run it till she pukes. o and it is for sure a 4200 mah battery it is in a clear package.

10-20-2009, 06:41 AM	#18
Killer RC Newbie Join Date: Sep 2009 Location: Middletown Posts: 44	What is the Delta Peak set at on your charger? If the Delta Peak is set too low then your charger will get a false reading and think that the pack fully is charged when it really isnt. Raise the delta peak to about 12mv and then try charging it.

10-20-2009, 05:58 PM	#19
tylinens69 Newbie Join Date: Sep 2009 Location: indiana Posts: 7	all is good i let it trickle all last night a day. she runs great now i think it was just setting too long. thanks for all the advice.

10-20-2009, 08:00 PM	#20
squatch71 I wanna be Dave Join Date: Sep 2008 Location: four o six Posts: 2,101	wow, learned something today...I remember the nicads doing that...didn't think the nimhs doing that...interesting...sorry for jumping the gun and saying return it....

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Thread: Battery with low run times. its supposed to be a 4200 mah but it runs like a 1500 mah