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Old 03-05-2002, 09:02 AM   #421
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speedo: I would try traying them after the run and leave them in for half an hour to an hour.

r32: Your tekin charger is fine. Were basically charging our HV's like nicads.
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Old 03-05-2002, 09:29 AM   #422
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Mr Danny: Which tray are you refering to? Trinity RT2 or the Intergy Octane 2? Which is a better tray? Many Thanks!
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Old 03-05-2002, 11:40 AM   #423
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Mika: I think they both do the same job just go with the cheapest one.
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Old 03-05-2002, 03:36 PM   #424
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Quote:
Originally posted by Danny/SMC
Were basically charging our HV's like nicads.
This is an interesting view in light of all the other battery-mumbo-jumbo going on. What are the chances that later on we discover that the HV's benefit from reverse-pulse charging just like the nicads did? :-)
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Old 03-05-2002, 05:53 PM   #425
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Danny, i think there is a big difference between RT2 and the Octane. The Trinity RT2 does not have a cut off, it just has a lamp inidcator, but it will drop your cell down to zero. Now, other trays, the Octane included, has individual cell cutoff.

Do you recommend trays without cutoffs?
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Old 03-06-2002, 09:46 AM   #426
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A tray with cutoff and one without will do a similar job. I have tested both types and the results were the same.
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Old 03-06-2002, 10:05 AM   #427
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Quote:
Originally posted by Cracker78
This is an interesting view in light of all the other battery-mumbo-jumbo going on. What are the chances that later on we discover that the HV's benefit from reverse-pulse charging just like the nicads did? :-)
I thought reverse pulse charging was a big hoopla? I never saw one bit of improvement with it myself... but then I touch a board or two every race so what do I know... lol
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Old 03-06-2002, 07:21 PM   #428
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Hey Danny, you starting a revolution or what?

1. You said you're treating your HVs like NiCds. Would you recommend it for other types of NiMH?

2. No cutoff trays, bringing down cell voltages to zero. You're saying it's fine for HVs, or NiMH in general?

Thanks for the replies, great help.
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Old 03-07-2002, 08:50 AM   #429
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I would basically only do this to Sanyo NiMh cells. They are different than other NiMH cells.
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Old 03-07-2002, 09:20 AM   #430
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I've got a few packs of hv's coming in the post and have a few questions about how I should treat them.

I am a student and consequently have to give up racing during term time. It seems that for long term storage I have to leave charge in them or the anodes will oxidise,killing the cell, but on the other hand everybody seems to be saying that if you store the cell with charge in then you will lose all voltage, bu if you discharge them too far it has major effects on run time.
Also do I need to cycle the cells when I bring them out of storage?

Whatever I was doing with my 2400's was obviously the wrong thing.
I was very surprised a couple of weeks ago when after trying all sorts of things to get my car on the pace with out any success, I borrowed somebody elses pack and gained 1/2 a second over a 10 second lap. The cells lasted fine but had no punch at all. Oh well. I needed some cells for my comm lathe.
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Old 03-07-2002, 09:23 AM   #431
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Also should I repeak the cells?
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Old 03-07-2002, 09:40 AM   #432
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dw: So far HV's have proven to have great shelf life. By this I mean they can stay stored for long periods of time with no side effects.

As far as runtime goes even if you tray them and lose runtime they will still have plenty to finish a race. The average RC-2400 is in the 285-290 range a trayed HV will be in the 320-335 range with more voltage than any Rc-2400.
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Old 03-07-2002, 10:15 AM   #433
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Danny,

You and other matchers are recommending a 30 amp discharge for the current crop of batteries, if I am not mistaken.
Why is everyone comming out with chargers that only discharge at 20 amps, i.e Reedy and Integy? Do we really have to invest $400 in a CE turbo 35 or will these other chargers be any good?

Thanks
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Old 03-07-2002, 10:43 AM   #434
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The reason why they only do a 20 amp discharge is because of cost. The circuitry needs to be better to handle 30 amps which is 50% more load than 20 amps.

I believe that a higher discharge rate trains the battery to perform a bit better but I can't really say if it's a big difference.
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Old 03-07-2002, 12:46 PM   #435
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Danny
Thanks for the reply.
So just to confirm; tray the cells for short term storage.
Charge them for long term storage, right?

1 more question
Do the hv's have problems with false peaking when charging at low temperatures (below 15 degrees centigrade) like the old sanyo's did?
It get's pretty cold outside here in the uk over winter.
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