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HelicopterMain Discussion › Charger for High Capacity Cells ??
04-28-2004 11:30 AM  13 years agoPost 1
bluefronted

rrVeteran

Pretoria, South Africa

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Hi Guys,

I'm looking for a charger that can charge NiCd batteries in the range of 5500mA to 600mA.I have D-size Uniross NiCd rated at 5500mA's.I use them to make up glow lighters.

My Robbe Infinity 2 and Triton , only charge up to +/- 3500mA

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04-28-2004 12:06 PM  13 years agoPost 2
z11355

rrMaster

New England

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Look into the Orbit units but they are $$$.

Why not just double charge them?

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04-28-2004 01:30 PM  13 years agoPost 3
bluefronted

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Pretoria, South Africa

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The robbe and Triton are too clever for that , they terinate the charge after a couble minutes on the second charge , somehow the chemistry is monitored

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04-28-2004 01:32 PM  13 years agoPost 4
z11355

rrMaster

New England

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hmmm,

maybe you need to tweak the Triton (dont know
about the Robbe) so that they don't detect peak
for 10-20 minutes.

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04-28-2004 01:39 PM  13 years agoPost 5
debogus

rrApprentice

Beauklahoma,peoples republic of mexifornia,USSA

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MRC
Tower hobbies has them

3500 mah ? 5000 = 1.5hr charge time ?

Dave

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04-28-2004 01:46 PM  13 years agoPost 6
z11355

rrMaster

New England

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are you talking about max charge *RATE* or
maximum amount of *CHARGE*?

I don't see anything that would indicate that
the Triton will stop at some maximum amount
of charge for NiCd (there IS a NiMH parameter
though).

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04-28-2004 11:31 PM  13 years agoPost 7
MJWS

rrKey Veteran

Airdrie, AB - Canada

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Is your charger false peaking? Normally if you turn the current down they won't false peak. Try trickle charging at 1/10C... lots of chargers will time out after 10+ hours... but they don't stop when they reach a set number of mah. Most chargers won't peak detect in the first few minutes, Nimhs are known to false peak frequently initially.

I have the astroflight 110. It'll push 8Amps into the battery. Up to 24 cells on nicads or nimh it certainly doesn't stop at 3500mah We routinely charge lithiums in the 8000 range on the Triton without incedent. We also use an astroflight 109 for both the large and small lithiums including 8000+ mah.

Some of the large capacity cells need to be charged at modest rates. Are you charging at a 600ma rate or 1C...? Triton only does 5A so you won't be over 1C. Your triton has adjustable peak detection for nicd and nimhs... make it less sensitive and try again. They may stop false peaking after a few cycles.

Good Luck

Mike

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04-29-2004 06:18 AM  13 years agoPost 8
bluefronted

rrVeteran

Pretoria, South Africa

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The 5500Ma Nicd D-cell that i'm charging is being charged at 500mA ie. less then C/10 , the Robbe Infin 2 manual stes clearly that the maximum capacity batteries to be charged must be 3000mA cells , but stops at +/- 3500mA , and yes the robbe can charge at a max current of 5A,

The triton , does the same as above,Both chargers stop around +/- 7 hours of charging.The 5500mA cell is discharged before charging.
I only have to charge this cell once in 2 months or more , with every weekend use.

Cells less then 3000Ma capacity have no problems being charged fully

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04-30-2004 12:37 AM  13 years agoPost 9
MJWS

rrKey Veteran

Airdrie, AB - Canada

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Can you hit the cell with a higher rate? I'm sure you've been there done that. There is no way in the world that the charger can tell whether you just took the battery off and put it back on. Discharge it 100ma and then put it on the charger for the second run, it won't peak exactly the same. They just watch for a voltage drop to detect peak, or trigger a temperature if you have the temp probe.

You can always throw money at it if you need an excuse to buy the ultimate shulze or orbit... so be it.. Different cells are cheaper than new chargers. Don't know much about the robbe, but the Triton isn't bad. You could always charge more frequently so you don't have to replace a full 5.5A. Then either would work.

Good Luck,

Mike

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04-30-2004 06:18 AM  13 years agoPost 10
bluefronted

rrVeteran

Pretoria, South Africa

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No kidding , the chargers do not run a second charge fully , they do a few mA , sometimes up to 100mA then end the cycle

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HelicopterMain Discussion › Charger for High Capacity Cells ??
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