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Old 09-03-2013, 06:46 PM   #451
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Yep.
Easy math. A 1000 mah pack is 1a.
C is a multiplier.
So a 1000 mah pack is 1a and a 5C charge rate on that pack would be 5a.
1x5=5

A 6500 pack @ 5C would be a 32.5a charge.
LoL I know I know, my brain must have computed 5A because I couldn't comprehend a charge rate of 5C.

This has been a fantastic thread!
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Old 09-03-2013, 07:07 PM   #452
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Danny at SMC says 2c is the best balance of speed and quality of charge. You can go to 3c if in a hurry but no more than 3c even if the pack allows it.

I think it really depends on your charger. If you have a PowerLab or comparable, run what you want. If you have a run of the mill charger, stay within his guidelines.
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Old 09-03-2013, 07:27 PM   #453
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What's the general consensus on the Orion chargers? I've got the Advantage Touch Pro...
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Old 09-03-2013, 08:16 PM   #454
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I know a couple guys that have that one and its a good charger as far as a quality charge. But your limitation may be your power supply, and the max 150w charge rate as far as speed goes.

It with do a 12a charge on a 2 cell pack, but the 150w rate will be a limitation for 4 or higher cell count. You may see a max charge amperage of about 10a charging a 4 cell pack where you might see the max 12a charging a 2 cell.

Amps = Watts / Volts

So 150 watts/14.8v (nominal) for a 4 cell= 10.13 amps.

It will do what it will do and make sure your power supply can provide at least 120% of what the charger can ask for at a minimum. You don't want to max out your power supply.

180 watts, 14.5a and 16v minimum for the power supply. Voltage is a wild card, the higher the amps, the lower the voltage it will pull. Wattage and amperage is the most important in the power supply and the decent ones are 18v.

Disclaimer:
This was a brain dump... someone correct me if I'm wrong on any of this.
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Last edited by fq06; 09-03-2013 at 08:37 PM.
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Old 09-03-2013, 08:32 PM   #455
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Great to hear, I'm only charging 2 cell packs, my power supply is the Muchmore Racing Power Master World Edition 2 EVO, they advertise 24 amp constant current.

I'm hoping that's enough...
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Old 09-03-2013, 09:14 PM   #456
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Your power supplies voltage is 11v to 15v (probably adjustable with a dial), amperage is 24 so 15 x 24 is 360 watts. They don't mention watts, but we'll assume that is the max.

A 12a charge on a 7.4v pack would be 89 watts so your well within range. Even using the peak voltage of 8.4 comes to 100.8.

All good... unless you want to get into 20a+ charging
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Old 09-03-2013, 09:25 PM   #457
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Your power supplies voltage is 11v to 15v (probably adjustable with a dial), amperage is 24 so 15 x 24 is 360 watts. They don't mention watts, but we'll assume that is the max.

A 12a charge on a 7.4v pack would be 89 watts so your well within range. Even using the peak voltage of 8.4 comes to 100.8.

All good... unless you want to get into 20a+ charging
Hehe I'll be switching from < 1C charging to 1.84C charging, I'll walk before I run...

Down at the local club in Melbourne we are a little bit more conservative, those charging at 10A or above are known as rebels and outlaws. The most I've seen anyone charging at is 16A which is still nowhere near the crazy talk I've been reading on this thread
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Old 09-03-2013, 09:56 PM   #458
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Talk to the guys flying planes down under. Plane guys are usually leading the pack when it comes to electric power tech and setup.

Enjoy your shorter charge times
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Old 09-04-2013, 08:41 PM   #459
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Talk to the guys flying planes down under. Plane guys are usually leading the pack when it comes to electric power tech and setup.

Enjoy your shorter charge times
Mate I cannot thank you enough for your help on this one and being patient with my n00bness...

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Old 09-04-2013, 09:32 PM   #460
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No problem, much better when you understand it. That way if nothing else you are buying the right equipment. And know the limitations like not maxing out a power supply and needing to replace it.
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Old 09-05-2013, 12:57 AM   #461
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What power supply is everyone here using with their icharger? ...the people NOT charging at 40A?!

I love this power supply.
http://www.google.com/search?q=alinc...&client=safari

Its only rated for 32 amps but I'm not sure you need to charge TWO batteries at 20 amps anyway since it takes like 45sec to juice a pack at that rate.

They use these for HAM Radios and for those that remember, KO USA sold these for a bit. I've seen these last over 10 years, probably longer than rctech has existed.

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Old 09-05-2013, 04:19 AM   #462
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Here is a cheap server power supply: 12v 74A (on 110v AC) or 108A (on 220v). The fan is pretty loud, but you can't beat the price from Ebay. All it takes is a little work.

http://www.rcgroups.com/forums/showthread.php?t=1005309
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Old 09-05-2013, 09:23 AM   #463
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http://www.ebay.com/itm/RC-POWER-SUP...item460be98e1e

That's the one I'm using right now. The guy actually posts here on rctech, but I forget his username. I preferred to just pay to have one already done rather than doing a bad job myself.
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Old 09-05-2013, 09:59 AM   #464
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Quote:
Originally Posted by fq06 View Post
For sure, I've never charged without balancing. Many reasons to balance but I don't want to writs a novel (and neither did you understandably).

Only one reason not to balance charge, speed but its not that much faster and not worth it.
I just recently started running 2S batteries (been running 1S for 1/12 since LiPo came to market) and I was shocked to see/hear most people running 2S batteries never balancing.

It does seem funny, people would work so hard to get the best chargers, high charge rates, best batteries... and then ignore a cell imbalance that could significantly shorten the life of the battery (by over charging one of the cells constantly)
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Old 09-05-2013, 02:31 PM   #465
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What power supply is everyone here using with their icharger? ...the people NOT charging at 40A?!
I've had good luck with this one...
http://cgi.ebay.com/ws/eBayISAPI.dll...m=200929683709
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