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Old Jan 03, 2013, 01:15 AM
vtol fan
nadine's Avatar
Joined Jul 2009
627 Posts
Question
Lipo charger

Hi guys..
I need to buy one small usb charger for one single lipo,rate charge min.10mah and max.50mah,it will be ok.
I have I MAX but the minimum charge current is 100 mah.
Somebody know where i could find?
Cheers..
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Old Jan 03, 2013, 06:17 AM
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Petefoss's Avatar
Oxford, Michigan, United States
Joined Aug 1999
2,356 Posts
http://www.didel.com/07charger/Bicha2.pdf sounds like just what you need.
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Old Jan 03, 2013, 07:48 AM
vtol fan
nadine's Avatar
Joined Jul 2009
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Hi Pete.
I found this at sparkfun,what do you think!?
https://www.sparkfun.com/products/10401
Cheers
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Old Jan 03, 2013, 10:40 AM
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Oxford, Michigan, United States
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Looks like it's a fixed charge rate of 0.5 amps. Unless you modify it. The Diedel has dip switches to change the current.
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Old Jan 03, 2013, 11:12 AM
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South Korea, Chungcheongbuk-do, Cheongju-si
Joined Jun 2009
59 Posts
Lithium polymer battery 3 magnification (3C) can be charged.
In other words, 10mAh battery charging is possible. 30mA

Will be the following ways: If you need to charge now.
1) Prepare a large discharge capacity battery.
2) Prepare a tester that can measure the current.
3) charger that you have to 1) of the battery charge.
4) Current is measured.
5) are connected as shown below.
Charger(+) <----> Variable Resistance(50k ohm?) <---> tester <----> Batteries(+)
Charger(-) <--------------------------------------------------------> Batteries(-)


6) 30mA by turning the variable resistor is adjusted to flow.
7) Replace the battery with 10mAh charge.

I did not try the experiment. ^ ^;
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Last edited by jjifar; Jan 03, 2013 at 11:29 AM.
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Old Jan 03, 2013, 01:45 PM
vtol fan
nadine's Avatar
Joined Jul 2009
627 Posts
Quote:
Originally Posted by jjifar View Post
Lithium polymer battery 3 magnification (3C) can be charged.
In other words, 10mAh battery charging is possible. 30mA

Will be the following ways: If you need to charge now.
1) Prepare a large discharge capacity battery.
2) Prepare a tester that can measure the current.
3) charger that you have to 1) of the battery charge.
4) Current is measured.
5) are connected as shown below.
Charger(+) <----> Variable Resistance(50k ohm?) <---> tester <----> Batteries(+)
Charger(-) <--------------------------------------------------------> Batteries(-)


6) 30mA by turning the variable resistor is adjusted to flow.
7) Replace the battery with 10mAh charge.

I did not try the experiment. ^ ^;
jjifar,thanks,for you tips...looks interesting,but too complicated for mee
I think i will go with,something,like sparkfun and i will try to recalculate the resistor
for a few charhging rates,10-20-30-40-50 mah and so on till 100 mah.And with help by a micro switches to select the correct rate needed..Cheers
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Old Jan 03, 2013, 02:34 PM
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South Korea, Chungcheongbuk-do, Cheongju-si
Joined Jun 2009
59 Posts
10mAh battery to charge I do not think we'll need to charge to 10mA.

10 ~ 50mAh battery being charged three times to 30 ~ 150mA If you thought it was safe.

Look, see below MCP73831 charger.

http://www.rcgroups.com/forums/showt...light=mcp73831
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Last edited by jjifar; Jan 03, 2013 at 02:46 PM.
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