RE: *Checking Batteries Between Flights*  
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All Forums >> Radios, Batteries, Clubhouse and more >> Batteries & Chargers >> RE: *Checking Batteries Between Flights*
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RE: *Checking Batteries Between Flights* - 12/21/2007 4:45:06 PM   
JPMacG


 

Posts: 1183
Joined: 1/2/2002
From: Ivyland, PA, USA
Status: offline 		At 4.8V under load there should be about 50% capacity left in a NiCd or NiMH pack. However, there are many variables and the only way to know for sure is to cycle the partially discharged pack to see how much capacity is left. Then you will have a better idea of how low you can go next time.

(in reply to warhwk)
       Post #: 26

RE: *Checking Batteries Between Flights* - 12/23/2007 9:45:05 PM   
Jazzy



Posts: 1106
Joined: 1/8/2002
From: Erie, PA, USA
Status: offline 		WOW!! You'd think with a college degree and an electricians license I'd have caught that before I posted!
Here are some other ways to do it.
(Of course I had to make it difficult on myself by using the DPDT switch . It was the only one I had at the time!)

Hey Rich! I didn't see you offer any schematics! But I did deserve the jib.







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_____________________________

Aww $#!^.... I left the )@#& transmitter at home!

(in reply to richrd)
       Post #: 27

RE: *Checking Batteries Between Flights* - 12/26/2007 6:09:43 PM   
hilleyja


 

Posts: 2186
Joined: 1/7/2002
From: Salem, WV, USA
Status: offline
quote:

ORIGINAL: rmw00

How does checking the loaded or unloaded voltage of a NiCd or NiMH battery before a flight tell you what the voltage will be at the end of the flight? A voltage test will tell you if there is some sort of failure or if you should not have flown the last flight. It can't tell you much about the next flight.


I go one step further than just checking the voltage. I hold the load for a few seconds to make sure the voltage stays steady. A battery that's just about to crap out will show a high voltage at first but then quickly drop under load.


_____________________________

Jim Hilley
AMA #671825
RCCA# 758
Twist 150 Brotherhood #14

(in reply to rmw00)
       Post #: 28

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