Battery Charger for BB-588/U

© Brooke Clarke, N6GCE


Background & Purpose

In order to have a light weight charger to support my PRC-126 when I am traveling.

Parts List

Photo

Construction

Operation

The Black lead goes to the battery negative terminal (the female one with the insulating sleeve) upper in photo.
The Red lead goes to the positive male terminal closest to the test point.
At the C/20 rate the battery should charge in 24 hours and then be disconnected from the charger which should be unplugged.
This is NOT intended to be a trickle charger and should not be connected to a battery and left for more than a day.

What is the NSN 6140-01-241-2295 Test Point used for?
Ans: The test point on the battery is a thermistor used to monitor battery temperature during charging.

Performance

The open circuit voltage of the transformer is about 20.5 VDC with no load and it has about 16 Ohms internal resistance.
A battery that is about 15.0 Volts will draw about 40 mA which is the C/20 rate for a 0.8 Amp Hour battery
like the Saft NSN 6140-01-241-2295 that is sold by Mike Murphy.

It would be nice to have a snap connector that mates with the battery, but I have not found a source.

Disclaimer

This is presented for informational use only and I assume no liability for any problem you may have.
Do NOT use this charger with the BA-588 (Note that BB-xxx batteries are recharagable NOT BA-xxx).
 

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