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Old Dec 15, 2004, 02:59 PM
Slow Tiger Stick Moth
Willie Levi's Avatar
Austin, Texas
Joined Oct 2003
178 Posts
Alright, I just got my LiPo (Etec 2 cell 1200mAh) in the mail today and will be soldering the connector on tonight.

I have a question though. When charging (using Triton), I should set a high voltage cut-off right? As I understand it, the pack will sit at 8.4v fully charged. But I remember my Triton giving readings of 10-12v sometimes when charging 8.4v NiMh packs. Will I see the same kind of voltage readings when charging the LiPo?

So, how should I make sure I don't overcharge?

Thank you!
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Old Dec 15, 2004, 04:46 PM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
21,019 Posts
Lipo charge voltage should NOT exceed 4.2V/cell. The Triton will start the charge at the selected current and charge at that rate until the pack voltage reaches 4.2V/cell at which time the voltage will remain at 4.2V/cell but the current will start to drop. If the V exceeds 4.2V/cell, the pack will be damaged and perhaps burn. That has happened to modellers setting their chargers for 3 cells when charging a 2 cell pack. The charger should automatically maintain 4.2V after the constant V cycle has started if the initial settings were correct.
3.7V for 1 cell pack
7.4V for 2 cell pack
11.1V for 3 cell pack
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Last edited by hoppy; Dec 15, 2004 at 04:49 PM.
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Old Dec 15, 2004, 10:25 PM
Registered User
supi7's Avatar
CHICAGO
Joined Feb 2004
1,616 Posts
May I suggest a li-po from TrueRC. the 2100 mah cells are very affordable. You can build your own pack CHEAP or you may also order a ready made pack with deans connector for additional $10.

http://home.comcast.net/~truerc

You can order online or just call.
Best Regards,

Dan
TrueRC
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Old Dec 15, 2004, 10:31 PM
Slow Tiger Stick Moth
Willie Levi's Avatar
Austin, Texas
Joined Oct 2003
178 Posts
Thanks hoppy! I'm checking it for capacity as we speak.

Sorry supi7.. Balsa Products already got my business
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Old Dec 15, 2004, 10:35 PM
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supi7's Avatar
CHICAGO
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Yes they have good products as well. Please consider us on your next project.

Best Wishes,

Dan
TrueRC
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Old Dec 16, 2004, 07:36 AM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
21,019 Posts
Quote:
Originally Posted by supi7
May I suggest a li-po from TrueRC. the 2100 mah cells are very affordable. You can build your own pack CHEAP or you may also order a ready made pack with deans connector for additional $10.

http://home.comcast.net/~truerc

You can order online or just call.
Best Regards,

Dan
TrueRC
How about a 5C discharge graph at 1 and 25 cycles?
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Old Dec 16, 2004, 06:52 PM
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as soon as I get my hand on some equipment I will post graph results. Right now all I can post are emails of Happy Costumers.
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Old Dec 17, 2004, 03:10 AM
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CHICAGO
Joined Feb 2004
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4130 AXi test

Tested a 4130 Axi motor (BIG MONSTER) with a 14x7 prop on a Phoenix 45 and a 4000mAh 11.1V Lipo from TrueRC

we did not have anything but a stop watch and a volt meter

we started at fully charged (week ago) 4000mah lipo and after 11 minutes of WOT the pack was still going strong and it was cool to touch. We got bored waiting for LVC and the end voltage was 11.28V.

Will test again on same setup next Thursday but at 22.2V of 4000mah
I will also make 4 2100mah packs for that plane and we will test at 22.2v as well.


Thats all for now

Thank you

Dan
TrueRC
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Old Dec 17, 2004, 07:41 AM
Space Coast USA
hoppy's Avatar
Space Coast
Joined Oct 2000
21,019 Posts
According to motocalc, the 4130-16 with that setup draws 10.5A and the 4130-20 draws 6A so we're looking at 2.6C for the 4130/16 motor and 1.5C for the 4130/20 motor.

With the 4130/16 and a 6s pack, 22.2V, motocalc is showing 28A or 7C and the 4130/20 is showing 16A or 4C.


By the way, which motor is it?
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Last edited by hoppy; Dec 17, 2004 at 07:44 AM.
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Old Dec 19, 2004, 12:53 AM
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hoppy, its the 4130/16

next Thursday we'll be testing it again at 22.2V 4000mA setup

and at 22.2V with four 11.1V 2100mA packs
I should have some Watt Meter result for you.
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