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Old 10-24-2006, 11:00 PM   #1
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Default Advice/Tips/info on batteries

hey guys can anyone explain why u need to discharge and why u need equalizer trays? how long discharge time or how long to equalize batteries. how often do u need to do this?

im just starting any infos would be great

im using MCR 969 Charger and 6 cells pack 3700 Peakracing and 4200 intellect batteries.
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Old 10-25-2006, 02:37 AM   #2
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Sure thing mate,

Ok when you are done racing a battery pack your voltage decreases and if you read the manual of your charger/discharger, it would say that you would take your pack and discharge it completely to keep the battery healthy, you never want to take a battery after racing it and just recharge it again. Now this is great but most dischargers can only take the battery voltage down to about 5V. Also at the same time when you discharge the battery pack, you are discharging the batteries in a serial combination, so when your charger indicates a complete discharge, your batteries are actually sitting at different voltages around 5.0-5.5V. Now why this is bad is that when you decide to charge the batteries again they will be uneven and this will cause bad battery wear, false peaking and over time the battery will lose its punch at an exponential rate.

Now with an equalizer, it discharges each cell individually down to a much lower voltage e.g. 0.0V (dead short) – 1.5V. Now this is important for two reasons. First you are getting the batteries to a much lower voltage so they retain their punch. Secondly each cell is brought to the same voltage so the batteries are then termed “equalized”.

The general procedure I use:

- Race the pack
- Let them cool down
- Put the pack on discharger (I generally discharge at 5A)
- Once the pack is discharged I let it cool down if it has heated up again
- Put the pack on the equalizer and leave the batteries on the equalizer until I am ready to charge again. You will find that most equalizers will actually hold the battery at the specified voltage until you take the pack off.

Hope that helps
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Old 10-25-2006, 06:21 AM   #3
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Take the time to read the info provided by these companies.

http://www.spcracing.com/ (click the battery care link)

http://www.surgeworldwide.com/faqs.html

http://www.harrisrc.com/batterycare.htm

http://www.feralbatteries.com.au/res....aspx?id=%2029

http://smc-racing.com/ (click the smc charging link)

You need to discharge and equalize to keep all the cells in the pack so when you recharge the pack all the cells are at or near equal performance. This achieves the best performance out of your pack.

Discharging should be done at 20-35 amps. This will depend on how high your equipment can discharge. And DO NOT completely discharge your Intellect packs. Discharge time depends on energy left in the packs.

Next you equalize. I equalize down to 0.9v per cell with the Novak Smart Tray. You will find this pretty common, especially with the Intellect batteries.

What type of equipment are you using/considering?


Edit: Here is another good thread on equipment.

http://rctech.net/forum/showthread.p...ighlight=deans

the CTX-D is a good peice of equipment for the money but you don't have to spend that much to get the job done.
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Old 10-25-2006, 01:41 PM   #4
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What can you use to Discharge and equalize a pack?
Is there a 1 peice unit that can do both?


getting back into r/c after 5 years has been a real bitch.
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Old 10-25-2006, 03:25 PM   #5
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-Team Much More CTX-D
-Trinity Discharger

Naut
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Old 10-26-2006, 12:02 AM   #6
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how long u guys equalize it? when to stop?... when the light bulb dims out? im using Much more tray.
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Old 10-26-2006, 12:53 AM   #7
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IMHO if you're getting back to rc you could get a platinum lipo and a team orion avionics or duratrax ice charger. Its probably allowed in club races so if ever you want to race you can use your lipo batt.
Spending for equalizers, dischargers and new batts every 6 months or so can get expensive. Not to mention the hassle of nimh routine and its not recommended to use nimh packs more than 3 times a day. WIth lipo you only need to rest the motor and top off the battery each time and keep playing the whole day.
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Old 10-27-2006, 12:13 PM   #8
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Unfortunately i've allready bought a ESC and 5 battery packs..

so going to lipo is not an option..
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Old 10-27-2006, 12:24 PM   #9
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Quote:
Originally Posted by mcgmark
What can you use to Discharge and equalize a pack?
Is there a 1 peice unit that can do both?


getting back into r/c after 5 years has been a real bitch.
the spintech battery manager will do both. for somewhere between $45 & $80
it will discharger at 35 amps, not heat the battery up, and balance by algorythum. This will keep your new batts fresh and add punch to the old ones. Be Blessed
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