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echo: tech
to: Joe Paulson
from: Tom Walker
date: 2003-11-23 08:39:44
subject: FIXESN22

-> After some experiments,I decided to recharge them in my NiCd 
-> charger (GE BC8B ),even though some articles warn against using 
-> it on NiMh batteries.These extra long batteries barely fit .
-> For the 1st hour,they were a little warm and 
-> the voltage was below 1.2 Volts.At the second hour,they were 
-> cool and at 1.25 V. After the 3rd hour,they were still cool and 
-> at 1.37 v.After another 1/2 hour,they still read 1.37 v. Then I 
-> quit.Checking the next day,after overnight in the refrigerator,
-> 3 were dead,but the others still at 1.37 v. .One article I've
-> read said that the final voltage could be 1.45 volts.The battery
-> pak was rated at 3000 mAh.

 I suggest making up a Test Discharge resistor and monitioring the
Refurbished cells to see how long they last. IF they last for 1000 mAh
or longer there could be lots of uses for them. And they are FREE. The
prolbem of course is that most likely if they are not standard sized
will have to be used Externaly.



-> I understand that you have to age new NiMH batteries properly.
-> You have to further discharge the cell to a lower value 
-> several times after each use.With these rebuilt cell holders,
-> I can use a resistor to take the voltage down to about 0.5 V.

Actualy that is WAY too low. .9 to 1 Volt is the suggested low
voltage point as I recall.

-> I keep all batteries in the refrigerator in plastic bags.

 Refigerated Storage for Alkaline and any Rechargable battery is not
necessary. It contributes Nothing to the Life of the cell.
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