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Old Jan 18, 2007, 02:22 PM
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Joined Dec 2006
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Question
How do I know when Lipos go bad?

Voltage? What can I do to test the batteries if I am having a performance problem (with the heli)?
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Old Jan 18, 2007, 02:25 PM
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San Jose Ca / RSA flyer
Joined May 2003
8,030 Posts
get a watt's up meter to sample and hold the readings
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Old Jan 19, 2007, 02:15 PM
AMA 951 since 1958
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USA, FL, Newberry
Joined Nov 2000
1,410 Posts
Here is a tip I got from FMA.

1) Install the charged pack in the aircraft.
2) Set the CellPro to .25 A
3) Run the speed control to discharge the battery. Leave the charger and
12 volt power supply connected.
4) Watch the LCD or log it with the PC viewer. The PC Viewer software will
show a very nice graph of the discharge. If they wait until charge complete, the LCD only updates every 60 seconds. When charging, the LCD updates every second.

Nathan Gwozdecki
Design Engineer, FMA Inc.
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Old Jan 19, 2007, 03:19 PM
Space Coast USA
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Space Coast
Joined Oct 2000
20,720 Posts
First, is this a new performance problem? Did they work before?
What are the batteries? Brand, number, size?
Do you know the amp draw?
Which helicopter? Motor?

Buy a battery analyzer - CBA, Whatmeter meter, Hyperion meter, etc. Allows you to measure watts out over time.
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