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NI-MH discharging? Why?!

NI-MH discharging? Why?!

Old 05-06-2007, 11:22 AM
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Default NI-MH discharging? Why?!

Why does everybody use a .9v cut-off discharge tray for their IB4200's if nickel metal hydrade cells DO NOT need to be deep discharged?
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Old 05-06-2007, 11:32 AM
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It's not for deep discharging, it's for getting all the cells to the same point before you charge. NiMH cells need to be stored with charge in them.
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Old 05-06-2007, 11:35 AM
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Thats right. This will ensure that none of the cells get over or under charged. If they all start at .9v at the start of the charge you have a better chance of a complete charge of all cells.

For stock racing i store the pack after the run(as there is lots of run time left over)
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Old 05-06-2007, 12:21 PM
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I see, so equalizing all the cells before the charge is best in order to get a complete equal charge of all the cells. So all a racer would need is 1 Novak smart tray?
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Old 05-06-2007, 12:33 PM
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I only ever used 1 novak smart tray. It worked really well. You may want to look at the new Tekin battery nurse as it will actually keep your cells at .9 for as long as they are plugged in and you can connect multiple batteries to it.

Check it out Battery Nurse
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Old 05-06-2007, 12:35 PM
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As long as you have something to pull most of the charge out first you should be fine. I discharge with my ICE down to .9v. Then I wait about 10 minutes and then put it on the Novak. This allows the voltage of the cells to come back up above .9v before putting it on the Novak.
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Old 05-06-2007, 01:05 PM
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Originally Posted by Johnny9s
I only ever used 1 novak smart tray. It worked really well. You may want to look at the new Tekin battery nurse as it will actually keep your cells at .9 for as long as they are plugged in and you can connect multiple batteries to it.

Check it out Battery Nurse
The Novak SE tray does this as well.
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Old 05-06-2007, 01:41 PM
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FYI they hold them below .9v but do not prevent the cell from going below.9 .8 .7 .6v ect ect ect..

So dont think u can just leave them on there for ever.
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Old 05-06-2007, 01:43 PM
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The only problem with discharging most of the capacity out of the cells using a charger, is that the pack gets discharged as a pack, not each cell meaning that one cell could be well below .9v whilst another could be a fair amount above.9v. I usually leave whats left in the pack and then use my Trinity discharger to get each cell down to .9v before using them at the next meeting. So far, so good, no probs!
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Old 05-06-2007, 03:37 PM
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so trinity has a tray also that does the same as the smart tray?
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Old 05-06-2007, 04:28 PM
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yeah, the DPD. Do a search on here, lots of talk on this unit.
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Old 05-06-2007, 06:12 PM
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the dpd is good but it takes forrrrrrrreeeeevvvveeeeerrrr!!!! to discharge even from 3.6...

stick with a Novak tray
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Old 05-07-2007, 03:08 AM
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yeah, your right about that! HAs anyone tried to use the pulse discharge feature of the discharger and then reflex charged their packs up? From what I understand, by doing this is reduces the bubbles (for want of a better word!) inside the cells reducing the IR. Is this right?
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