C
Chris W
- Jan 1, 1970
- 0
I have a Kenwood PB-39 9.6V NiCd battery for my Kenwood TH-G71. It has
5 contacts on it. On the side that is in contact with the radio, there
are 2 contacts labeled + and - so I will call them R+ and R-. On the
back of the pack there are 3 contacts labeled, -, T and + I will call
them B-, BT, and B+. I have a universal smart charger that will charge
anything from a 1 to 30 cell NiCd or NiMH or similar voltage lithium and
lead acid battery packs.. If I connect that charger to the B- and B+,
it does nothing. Same if I hook it to any combination of the 3 contacts
on the back. It has a way to sense if it is hooked to a battery and if
the polarity is correct before it will start charging. If I hook the
charger to R+ and R- it will charge, to do that I have to take the
battery off the radio. BTW the charger is an Orbit Microlader made in
Germany, marketed to the RC airplane industry. There is something that
won't let the charger work right between the battery and those contacts
on the back. I want to know what. So here is the experimenting I have
done. With the battery in a stable state (two days since it was charged
and no load has been applied).
Voltage measurements.
R+ and R- = 10.562V
B+ and B- = 10.526V
B+ and BT = 10.517V
B- and BT = 0.000V
R+ and B- = 10.560V
R+ and BT = 10.551V
R+ and B+ = 0V
R- and B- = 0V
R- and BT = 0V
R- and B+ = 10.527
All of these measurements were repeatable with in +/- 0.001V
Resistance measurements.
resistance between leads on DMM 0.30 ohms
R- and B- = 0.30 ohms so really zero.
R- and BT = 8.9K ohms
R+ and B+ = meter display flashes 0L and the auto ranging graph at the
bottom bounces back and forth.( not sure what that means)
Other than the resistor between the negative side of the battery and the
BT terminal what does this all tell me if anything? And more
importantly is there anyway to trick my charger to work with the
contacts on the back of the battery?
--
Chris W
KE5GIX
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give the gifts they want
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5 contacts on it. On the side that is in contact with the radio, there
are 2 contacts labeled + and - so I will call them R+ and R-. On the
back of the pack there are 3 contacts labeled, -, T and + I will call
them B-, BT, and B+. I have a universal smart charger that will charge
anything from a 1 to 30 cell NiCd or NiMH or similar voltage lithium and
lead acid battery packs.. If I connect that charger to the B- and B+,
it does nothing. Same if I hook it to any combination of the 3 contacts
on the back. It has a way to sense if it is hooked to a battery and if
the polarity is correct before it will start charging. If I hook the
charger to R+ and R- it will charge, to do that I have to take the
battery off the radio. BTW the charger is an Orbit Microlader made in
Germany, marketed to the RC airplane industry. There is something that
won't let the charger work right between the battery and those contacts
on the back. I want to know what. So here is the experimenting I have
done. With the battery in a stable state (two days since it was charged
and no load has been applied).
Voltage measurements.
R+ and R- = 10.562V
B+ and B- = 10.526V
B+ and BT = 10.517V
B- and BT = 0.000V
R+ and B- = 10.560V
R+ and BT = 10.551V
R+ and B+ = 0V
R- and B- = 0V
R- and BT = 0V
R- and B+ = 10.527
All of these measurements were repeatable with in +/- 0.001V
Resistance measurements.
resistance between leads on DMM 0.30 ohms
R- and B- = 0.30 ohms so really zero.
R- and BT = 8.9K ohms
R+ and B+ = meter display flashes 0L and the auto ranging graph at the
bottom bounces back and forth.( not sure what that means)
Other than the resistor between the negative side of the battery and the
BT terminal what does this all tell me if anything? And more
importantly is there anyway to trick my charger to work with the
contacts on the back of the battery?
--
Chris W
KE5GIX
Gift Giving Made Easy
Get the gifts you want &
give the gifts they want
One stop wish list for any gift,
from anywhere, for any occasion!
http://thewishzone.com