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Old 12-30-2006, 03:27 PM   #1
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Default help with discaharging and equalising

i race a 4 cell mardave car and use 3700 nimh batteries. i have a ROBITRONIC rs111 discharge/ equaliser tray. and struggling to use it, do i attach a 12v 50watt bulb to get rid of some power then attach the pack to the equaliser tray , BUT how long will it it take to discharge . as i left it discharging overnight and then charged up on a pro peak charger and only took 15 mins to re charge.

any help please and advice on how to equalise my 3700 and keep in top condition

PLEASE CAN SOMONE ADVISE MORE

Tim
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Old 12-30-2006, 05:07 PM   #2
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I'm not a seasoned pro, but to the best of my knowledge, all discharging, especially when done in series should have a cutoff at 0.9 volts times the number of cells in series. Overdischarging cells can be bad for them. So you need to stop the discharge in series when it hits 3.6 volts. There is no way to judge the time, you have to monitor voltage.

Are you saying your pack fully charged in 15 minutes? Any chance it false peaked?
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Old 12-31-2006, 02:41 PM   #3
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Default discharging help

yes it cut off fully charged in 15 minutes.

how should i discharge and equalise my 4 cell pack so to keep optimum power.

any help please
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Old 12-31-2006, 07:39 PM   #4
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Quote:
Originally Posted by top-timm
yes it cut off fully charged in 15 minutes.

how should i discharge and equalise my 4 cell pack so to keep optimum power.

any help please
Standard advice is to discharge the cells at high amperage, 20-30 amps until the pack reaches 3.6 volts, then put the pack on the discharge tray and discharge each cell individually until each cell reaches 0.9 volts. The robitronic is an automatic cutoff tray from the ads. What voltage does it discharge to? If adjustable, set it at 0.9 volts per cell.
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Old 12-31-2006, 07:41 PM   #5
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Quote:
Originally Posted by top-timm
yes it cut off fully charged in 15 minutes.
Unless you charged it at a very high amperage (not recommended), the pack must not have been discharged before it was recharged. If you charge a 3300 pack at 6 amps, it takes 33 minutes (roughly) to charge it.
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