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Old Aug 02, 2012, 08:39 PM
RC Helicopter Pilot
TheWoodCrafter's Avatar
United States, CA, Westminster
Joined Mar 2010
1,696 Posts
I know the iChargers do have an adjustable cut off voltage.
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Old Aug 03, 2012, 12:00 AM
REVOJohn's Avatar
Singapore, Singapore
Joined Apr 2012
405 Posts
revolectrix is selectable from 3.3 - 4.28
and it even had a 4.1V long life charge application to select in the main menu
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Old Aug 07, 2012, 05:18 AM
PEMAC
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Australia, New South Wales, Penrith
Joined Jul 2007
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I always set mine to 4.18
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Old Aug 13, 2012, 08:28 PM
Registered User
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Hungary, Heves, Eger
Joined Aug 2012
367 Posts
I have a question maybe a little stupid but pls excuse me I dont really get how lipos (or akkus for that matter) work so:

If 2 single 1000mah 3.7v 20C cell is combined is it going to be a 2s 2000mah 7.4v 40C pack? Or just a 2s 1000 mah 7.4v 40C(or 20C)?

Ty and again excuse me but Im dieing to know.
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Last edited by CReal; Aug 13, 2012 at 08:39 PM.
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Old Aug 13, 2012, 09:57 PM
Space Coast USA
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Space Coast
Joined Oct 2000
21,162 Posts
Depends

If they are connected in series, you add the voltages, the C and mah capacity remain the same.
2 single cell 2000mah 20C lipos connected minus to plus will have a voltage of 7.4v and a capacity of 2000mah and a C-rate of 20. It will be a 2s1p 2000mah 20C pack.

2 single cell 2000mah 20C lipos connected in parallel will have a voltage of 3.7v and a capacity of 4000mah with a C-rate of 20. It will be a 1s2p4000mah 20C pack.
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Old Aug 13, 2012, 10:25 PM
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Hungary, Heves, Eger
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TY so much!
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Old Aug 13, 2012, 10:33 PM
wood is good
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United States, CA, Marina Del Rey
Joined Jun 2012
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Today I received (4) new 4s 2200 30c Glacier batteries from EP Buddy. I have a new 206B iCharger and Junsi P350 power supply standing by. But my plane is not yet ready to fly and I am still crashing planes on my simulator so I am also not ready to charge the batteries.

Question: Should I measure the battery voltages, now? Across the balance plug pins? I have a digital voltmeter.
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Old Aug 13, 2012, 11:06 PM
RC Helicopter Pilot
TheWoodCrafter's Avatar
United States, CA, Westminster
Joined Mar 2010
1,696 Posts
Measure through the balance plug.
Check every cells voltage.
You don't want to see a really low cell.
All should be close to 3.85V or there abouts.
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Old Aug 14, 2012, 12:20 AM
Space Coast USA
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Space Coast
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Be careful NOT to short the testprobes together!
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Old Aug 14, 2012, 09:57 AM
wood is good
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Thanks, fellas.

Also have a charging bag on the way.
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Old Aug 14, 2012, 12:12 PM
Space Coast USA
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Space Coast
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I hope it is a LipoSack or another brand that has been tested.. Many of the bags on the market are no better than paper bags.
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Old Aug 14, 2012, 01:33 PM
wood is good
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United States, CA, Marina Del Rey
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Alas it is a cheap import (same with my airplane, motor, radio system, batteries, charger and power supply):

http://www.ebay.com/itm/Lipo-Charge-...ht_3458wt_1239

Hope to test it soon.
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Old Aug 14, 2012, 01:47 PM
Space Coast USA
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Space Coast
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Quote:
Originally Posted by loNslo View Post
Alas it is a cheap import (same with my airplane, motor, radio system, batteries, charger and power supply):

http://www.ebay.com/itm/Lipo-Charge-...ht_3458wt_1239

Hope to test it soon.
I hope it never gets tested in use.

Here are some videos of tests other modelers have run on lipo bags.
http://www.rcgroups.com/forums/showp...6&postcount=14
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Old Aug 14, 2012, 01:58 PM
wood is good
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United States, CA, Marina Del Rey
Joined Jun 2012
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Hoppy--Thanks for the link.

WOW! Glad I didn't order the Turnigy bag. (I realize there are many others like it)

The first vid showed the Lipo Guard bag containing everything but the smoke. Can I take that to mean it did its job?
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Old Aug 14, 2012, 02:08 PM
Space Coast USA
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Space Coast
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Quote:
Originally Posted by loNslo View Post
Hoppy--Thanks for the link.

WOW! Glad I didn't order the Turnigy bag. (I realize there are many others like it)

The first vid showed the Lipo Guard bag containing everything but the smoke. Can I take that to mean it did its job?
Look at the back of the bag at 1:14 sec. See the flames coming out? I wouldn't use that one.

And of course, the bag has to be tested for the size of pack that will be charged in the bag. A bag that passes with a 3s1000mah pack may fail completely with a 3s 2500mah pack. It's not an easy decision to make. I use a small portable BBQ grill with a locking top. It will contain the flames (hopefully). Someday I need to test it.
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