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#41
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im not sure what year cells i have, i thought i had the new worlds smc 42s?
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Team Associated- HobbyWing- Reedy- CML |
#42
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personally id say power is irelevent, they need to be safe 1st
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
#43
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yours havent exactly been the most reliable have they stanny boy?
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#44
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Received this e-mail of Paul Worsley earlier on.
Hi Mark, Just been reading the posts regarding your cell going 'bang'. Quite simply, you were charging them outside the manufacturers recommendations. The data sheet supplied by Intellect clearly states :- Maximum charge rate 1C That means that you should never charge at more than 4.2 amps. The recommendations from any of the 'matchers' is always dubious, as they did not produce the cell. The correct rate of charge for cells is ambiguous in many cases. Example :- GP 4300 cells clearly state on the cell that they should be charged at 0.41 amp (410 ma.) and should not be soldered. However their data sheet states that the cell can be charged up to 6 amps. So if one goes bang when charging at 6 amps, would it be recognised that they have been misused ?? My guess is that in a court of law, the instructions on the cell would be the ruling factor. Intellect do not state any charging recommendations on the actual cell. I have advised them several times that this is not good practice and they could be liable for any claims, as their product does not state how it should be used. I think that common sense dictates that cells should never be charged at more than 1C (4.2 Amps) I would be concerned at anything over 5 Amps. The cells should never be 're-peaked'. A further consideration is the nature of NiMH cells. MiMh cells 'self discharge' at varying amounts. The gives the situation :- If cells have been stored in a charged condition and unused for a period of time, the capacity remaining in the cells can vary greatly. When the cells are then charged, the charger cannot always accommodate this variation and some cells can be greatly over-charged. Touring Car drivers often charge at 7, 8 and even higher amps, and as a result they have more cells go 'bang' than Off-Road drivers. Hope this helps, Paul Worsley. (Cell homologation officer) Hope this ok to post Jimmy and Paul.
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Associated SC10. Associated RC8. Atomic Carbon S4. Paint by Wezzer. |
#45
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I think the moral of the story is equalise before you charge
And then charge at 10 amps |
#46
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but i do!! i give them a good seeing to on the novak smart tray before each charge, and they still pack in!
bring back 1400scr's, they were mint |
#47
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1200 SCEs, now they kept you entertained!!
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#48
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Quote:
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MBModels - Schumacher Racing - Vapextech.co.uk - MRT - Savox - SMD |
#49
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i was dissapointed with my IB cells as well. i never had any explode but i bought a couple of brand new packs and one is venting after only a handful of charges. this is making me think that i did a big mistake and should have just gotten one lipo instead of 2 6 cells. i also have a few GP cell packs which are over 2 seasons old and still arent venting although they dont charge to full capacity i still get crazy voltage from them and no venting.
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Kyosho Lazer zx5 Academy GV2 Team Losi LST2 |
#50
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I have found venting happened on the first charge or two, then nothing since.
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#51
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It appears we are all using the wrong cells then.......
Think you are getting the highest voltage out of your IB4200WE's? have you ever looked at the EP4200 cells? much more reliable than the IB's and the voltages are....... well buy some from demon an see for yourself, £32.50 for an assembled matched pack ask if you want to read my review on them, bit wordy but most things you need to know. |
#52
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Are the EP 4200 Cells BRCA Legal?
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Associated SC10. Associated RC8. Atomic Carbon S4. Paint by Wezzer. |
#53
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YES see below
it's in the EB section of BRCA Quote:
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o0ple Trader Feedback NE Venue's New & Old my space on YouTube CFR RCTV Channel Glenn Atterton BRCA 2005 1/10th Off-Road Veterans Champion LMP12 National Champion 2003/2004 / F3 class |
#54
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#55
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Hi sorry to inturrupt but got a question here since its about cells. How do you find out that a cell has gone bad in a battery pack? Can i use a multimeter and put to voltage setting to check each cell? Or is there any better device? Thanks
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#56
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Quote:
you don't need a Pro-Trak, you can use a DVM & your charger
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o0ple Trader Feedback NE Venue's New & Old my space on YouTube CFR RCTV Channel Glenn Atterton BRCA 2005 1/10th Off-Road Veterans Champion LMP12 National Champion 2003/2004 / F3 class |
#57
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Quote:
The first 2 sets discharged without and problem but half way through discharging the 3rd pack there was an almighty bang and one cell had exploded across my living room floor, fortunately no one was hurt. The other 3 sets discharged without any problem and I immediately telephoned Mike at Modeltech and told him what had happened. As instructed I returned the remains and the rest of the pack to him as requested. He was most concerned and apologised stating that they'd had no problems with the EP's, although another club member had one exploded whilst charging (don't know at what settings). I said there was no need to apologise as he had no way of seeing inside these cells and he duly returned the pack with the defective cell replaced. Although I never charge at more than 5 amps, with my driving more power isn't exactly needed, I could have understood it more if it had been charging but discharging! I bought the EP's due to all the scare stories with the IB's and whilst a lot less frequent it would appear the EP's are not totally immune from problems. I've not had any problems since, although they've only been used for one meeting, and hats off to Mike at Modeltech for standing by what he sells and sorting it so quickly.
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Losi Eight T - Nova Rossi P21-7T- Hitec 5955's & Spektrum + TeknoRC Losi 8ET - Neu 1515-1Y - MGM 16025 & Hitec 5995's. RC Heli's - Align T Rex 600 Nitro Sport - X-Cell Spectra G gasser. |
#58
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There not perfect, no cell is but i have put mine through a fair few cycles so far (only ever discharged in the car so far, no equalising tray ATM) and nothing hase ever gone wrong.
What kind of numbers are you getting on the labels Gramey?
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Canon 40D (350D backup) - EF-S 18-55 - EF-S 17-85 - EF 100-300 - EF 50 - Canon 430 EX || Speedlite - Canon BG-E2N Grip Adobe Photoshop CS4 Extended AX-10 Crawler - Thats all I have left!!!
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#59
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Quote:
How long have you had the EP's for and how many events
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#60
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I got 5 sets of IB3800 and discharged plus equalized them as soon as i got them, ive had mine now for well over a year, and they still have loads of punch in them, ive had no problems what so ever
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