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Ni-MH Questions

Old 02-21-2018, 11:34 PM
  #16  
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Originally Posted by the rc guy View Post
if your gonna use Nimh you will need to condition them on a long slow charge at .10 amps
you can use them more than once a day
id stay under the 1 c charge rate
Balance a nomh ..LOL funny no balance plug but the conditioning will do that ..only charger i knoe that will is a Futaba CDR 5000 its about $500.
discharge can be done many ways..10amp or 5 or even 20+
"Conditioning" a pack at a low charge rate does not balance them. When they're connected in series there's no way to move charge from one cell to another.
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Old 02-22-2018, 12:42 AM
  #17  
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Originally Posted by gigaplex View Post
"Conditioning" a pack at a low charge rate does not balance them. When they're connected in series there's no way to move charge from one cell to another.
NiMh can safely handle overcharging at 0.1C, chargers even kept this current after fast-charging ended, although im not sure why. This way, all cells have time to charge to full capacity.
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Old 02-24-2018, 07:06 PM
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Originally Posted by the rc guy View Post
if your gonna use Nimh you will need to condition them on a long slow charge at .10 amps
you can use them more than once a day
id stay under the 1 c charge rate
Balance a nomh ..LOL funny no balance plug but the conditioning will do that ..only charger i knoe that will is a Futaba CDR 5000 its about $500.
discharge can be done many ways..10amp or 5 or even 20+
There was another charger called the ICC (individual cell charger) made by a company Spintec in the Netherlands, that contacted each cell individually.
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Old 02-25-2018, 09:16 AM
  #19  
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Originally Posted by SocalSnakeEyes View Post
May I ask why you think that?
Lipo’s in my opinion are safer. Last longer. Are nearly as cheap. Lipo’s are supersuperior in every way.
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Old 02-25-2018, 10:27 AM
  #20  
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Originally Posted by Fran View Post
There was another charger called the ICC (individual cell charger) made by a company Spintec in the Netherlands, that contacted each cell individually.
ICC Charger & Discharger

ok still a $350 charger and is limited to packs layout..so how would a traxxas pack work in this .Oh it wont
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Old 02-25-2018, 03:57 PM
  #21  
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Originally Posted by Juan Aveytia View Post
Lipo’s in my opinion are safer. Last longer. Are nearly as cheap. Lipo’s are supersuperior in every way.
I'm going to have to respectfully disagree with you about them being safer. I don't remember having to buy a NiMh bag to race at my local track.

NiMh:
GP 3700 cells*
https://www.youtube.com/watch?v=oz001A26XW4

TRX 7cell pack
https://www.youtube.com/watch?v=GQ9qVP4McCM
--------------------------------------------------------------------------------------
LiPo:
https://www.youtube.com/watch?v=5vcRTQcaUVE *Make sure to watch through 6:15.

Both of the above * are the same person. ^

Other problems:

787
https://en.wikipedia.org/wiki/Boeing...ttery_problems

Note 7
https://www.faa.gov/news/updates/?newsId=86685

Max Amps
Family said battery in remote-control toy caught fire in home | abc13.com
Make sure to watch the vid to the end. But, Keep any mind the batteries and the truck are made by two different manufacturers before we get on a tread closing tangent.
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Old 02-25-2018, 04:11 PM
  #22  
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Originally Posted by SocalSnakeEyes View Post
I'm going to have to respectfully disagree with you about them being safer. I don't remember having to buy a NiMh bag to race at my local track.

NiMh:
GP 3700 cells*
https://www.youtube.com/watch?v=oz001A26XW4

TRX 7cell pack
https://www.youtube.com/watch?v=GQ9qVP4McCM
--------------------------------------------------------------------------------------
LiPo:
https://www.youtube.com/watch?v=5vcRTQcaUVE *Make sure to watch through 6:15.

Both of the above * are the same person. ^

Other problems:

787
https://en.wikipedia.org/wiki/Boeing...ttery_problems

Note 7
https://www.faa.gov/news/updates/?newsId=86685

Max Amps
Family said battery in remote-control toy caught fire in home | abc13.com
Make sure to watch the vid to the end. But, Keep any mind the batteries and the truck are made by two different manufacturers before we get on a tread closing tangent.
I don't get your point, nimh are little bombs when improperly used as well. Most of the cases you link are user error or bad design. Same thing can be said for lead acid, nicad or any type of battery chemistry.

There is a reason every cell phone in the world uses Lipo.
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Old 02-25-2018, 04:14 PM
  #23  
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Originally Posted by SocalSnakeEyes View Post
I'm going to have to respectfully disagree with you about them being safer. I don't remember having to buy a NiMh bag to race at my local track.

NiMh:
GP 3700 cells*
https://www.youtube.com/watch?v=oz001A26XW4

TRX 7cell pack
https://www.youtube.com/watch?v=GQ9qVP4McCM
--------------------------------------------------------------------------------------
LiPo:
https://www.youtube.com/watch?v=5vcRTQcaUVE *Make sure to watch through 6:15.

Both of the above * are the same person. ^

Other problems:

787
https://en.wikipedia.org/wiki/Boeing...ttery_problems

Note 7
https://www.faa.gov/news/updates/?newsId=86685

Max Amps
Family said battery in remote-control toy caught fire in home | abc13.com
Make sure to watch the vid to the end. But, Keep any mind the batteries and the truck are made by two different manufacturers before we get on a tread closing tangent.
To add to this, keep in mind that ALL batteries can be dangerous!

Alkaline can pop just like NiCad/NiMh if shorted, leaking acid out of them as well as being very hot.

Lead-Acids like the ones used in starter boxes or full size cars produce Hydrogen gas when being used, changing or discharging. Any sparks can set them off.
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Old 02-25-2018, 07:02 PM
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Originally Posted by SocalSnakeEyes View Post
To add to this, keep in mind that ALL batteries can be dangerous!

Alkaline can pop just like NiCad/NiMh if shorted, leaking acid out of them as well as being very hot.

Lead-Acids like the ones used in starter boxes or full size cars produce Hydrogen gas when being used, changing or discharging. Any sparks can set them off.
When lipo’s were first being used in onroad cars. We racers experimented and pushed the batteries the wrong way. Not much different than NIMH. I’ve seen them all blow up over the years. The worst I see now a days is a swollen Lipo battery. When properly charged. Lipo’s will give you hundreds of runs without any problems. I personally never use lipo bags. Even at my home. They’re by far safer and superior. I could easily find videos of NIMH batteries blowing up on people. Overall, lipo is just easier and safer
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Old 02-25-2018, 09:35 PM
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Originally Posted by Darkgenerals View Post
I don't get your point, nimh are little bombs when improperly used as well. Most of the cases you link are user error or bad design. Same thing can be said for lead acid, nicad or any type of battery chemistry.

There is a reason every cell phone in the world uses Lipo.
And that reason is voltage and MAH rating within a small package. Nothing to do with safety since LiPo incinerates at high temps, thus some phones exploding with balls of fire in pockets. Nickel metal batteries will pop and explode the casing, not balls of fire. Both can be dangerous though.
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Old 02-27-2018, 02:20 PM
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I really hate when people do that. You cannot prove your point using short-circuit!

The only difference between lipos and nimh is that the container is soft instead of rigid. It's why NiMH explode and LiPO flame out.

Now that we have some experiece with this new chemistry, we cannot say that LiPO are safer. LiFE are safer because they can endure very high C charge and discharge. LiPO are as complex as use as NiMH, They have optimal temperature to work, and follow the same rules as every energy capacitor.

So the only point you can have here: If you are bashing, not racing, use NiMH, there are less risks to kill your battery because of low-tension. The rest is a matter of preference and budget.
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Old 03-20-2018, 01:20 AM
  #27  
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This thread got a bit out of hand folks! He’s just using the battery for a nitro starter. Charge the pack at 5C and fire up your nitro motor. When it dies charge it up again. Repeat as needed.
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Old 03-20-2018, 11:03 AM
  #28  
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Originally Posted by Vintagedriver View Post
This thread got a bit out of hand folks!
That hardly ever happens...lmao
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