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Traxxas Series 3 7-cell NiMH

Traxxas Series 3 7-cell NiMH

Old 08-12-2009, 11:04 AM
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Default Traxxas Series 3 7-cell NiMH

Hi.

I just got an ICE charger and want to know what mAh I set the charger to for my Traxxas Series 3 7-Cell? The pack doesnt say anywhere but I think 3300? (I think I answered my own question here)

Also, what Amps can I charge this battery at? I asked in passing at my LHS last night but dont recall. I'm pretty sure their answer was over 3.3

thanks

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Old 08-12-2009, 03:33 PM
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Originally Posted by Drusillus
Hi.

I just got an ICE charger and want to know what mAh I set the charger to for my Traxxas Series 3 7-Cell? The pack doesnt say anywhere but I think 3300? (I think I answered my own question here)

Also, what Amps can I charge this battery at? I asked in passing at my LHS last night but dont recall. I'm pretty sure their answer was over 3.3

thanks
I had a couple of these and charged them at 4 amps. I don't use the 1C rule with my nimh, my 4200's get charged at 5-5.5 and peaked at 6 amps. Never any problems. And yes they're 3300's .
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Old 08-19-2009, 06:21 AM
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Thanks for the reply. I have been told by a few people that I can charge this battery at 5 amps.

Last night at the track, I plugged in the battery and set it to re-peak.

The battery got to 160 degrees (tested with a hand held temp gauge) and started to smell a bit of melting plastic. I immediately unplugged it, let it cool and used the battery in my qualifying race and it seemed to be OK.

What would have caused the over-heat? The only adjustments I made to the settings in the ICE charger for a 7-cell NiHM was changing it from 3600mah to 3300mah and adjusted the charge amps from 3.6 to 5.0.

Thanks in advance.
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Old 08-19-2009, 06:27 AM
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I don't have an ICE but I'm almost positve all nimh chargers have a mv cut-off setting. I can't remeber off hand if you need to adjust it up or down to get it to peak sooner. Charging at higher amps will create more heat but it should have peaked before it got to 160, thats too hot for nimh. Stay under 130. 5 amps might be a little high for those packs, I stayed at or under 4.5 with mine. You will need to adjust the mv. cut-off though.
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Old 08-19-2009, 06:34 AM
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Originally Posted by racer1812
I don't have an ICE but I'm almost positve all nimh chargers have a mv cut-off setting. I can't remeber off hand if you need to adjust it up or down to get it to peak sooner. Charging at higher amps will create more heat but it should have peaked before it got to 160, thats too hot for nimh. Stay under 130. 5 amps might be a little high for those packs, I stayed at or under 4.5 with mine. You will need to adjust the mv. cut-off though.
Thanks, I will check what the mv cut-off is set at later today and reply with it here.
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Old 08-19-2009, 10:35 AM
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OK. Here are the settings I have programmed into my charger for the 3300 7-cell NiMH battery:

- NiMH 7Cell 3300mAh
- Charge Current: 5.0A
- dCharge Current: 3.3A
- Peak Sens.: 5mV/C
- dCharger Volt: 0.9V/C
- Trickle Current: 150mA
- Cut-off Temp: 116 Degrees F. (I do not have a temp cable for the charger)
- no. of cycles: 1time
- cycle delay: 20min
- cycle mode: D -> C
- Max Charge Capa: 150%
- Peak Delay: 3min
- top-off charge: 500mA

Like I mentioned, the only settings I changed from factory was the mAh, from 3600 to 3300 to match my battery, and the charge amps from 3.6 to 5.0

thanks again. I am having a hard time grasping all the setting possibilities.
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Old 08-21-2009, 06:06 AM
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Mercy bump. Any issues with the settings I have?
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Old 08-21-2009, 10:29 AM
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try 4 amps and raise your peak sensitivity to 8mv and try it again....try to keep it under 130deg.
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Old 08-21-2009, 10:53 AM
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If you want it to shut down earlier, tell the charger to look for a smaller peak. I'd use 3mv/c for a new pac. As pac gets older, then I bump the peak sensitivity up a little. My oldest pacs are using 5 or 6mv/c.

The ICE has an auto setting - you may want to try that.

Also, if you have the temp sensor, set it to 115-120F. The temp seen by teh sensor lags behind the temp of the batt, so you use a lower setting to cut teh charge off at a reasonable temp. If you used 130, batt would get too hot before the temp sensor finally cut it off. If you don't have it already, save your money. I was disappointed in mine, its just lags too far behind the temp you see with a goot IR gun.
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Old 08-21-2009, 10:58 AM
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Thanks guys!
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Old 08-22-2009, 09:26 AM
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Go with what Duster said, I'm sure he's right on the lower mv setting. I never change my setting so I wasn't sure..Sorry
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Old 08-23-2009, 12:50 PM
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Originally Posted by Drusillus

What would have caused the over-heat?

I plugged in the battery and set it to re-peak.

Thanks in advance.
The first time it ended it was full , and the re-peak was all overcharge. In short, the battery was overcharged by xx amount equal to the rate by peak delay at start time. I thik that is how the ice handles a "re-peak" I'm not 100% sure becuase I don't use re-peak and forgot that it had that function. All your setting s are fine, but use "charge" rather than "re-peak"
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Old 08-23-2009, 04:21 PM
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I've got a pair of Traxxas 7 cells that are 3000mah, but they are the ones w/ black shrink wrap, not clear.
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