DEC RK05 Emergency Retract Batteries

Christian Corti cc at
Mon Mar 14 11:55:23 CDT 2016

On Mon, 14 Mar 2016, Doug Ingraham wrote:
> The only difference in NiMH and NiCd charging schemes occurs when rapid
> charging them.  When rapid charging both types would use a DV/DT technique
> coupled with a temperature sensor.  The DV/DT is much smaller for NiMH than
> NiCd.  So if they went to the effort to recharge fast after an event (why
> since you could probably do several retracts on a charge) you would not
> want to use NiMH replacement batteries.  It is unlikely that anything other
> than a trickle charge was used with these batteries since it is cheap,
> simple and reliable.  The trickle current would have been 30 to 50 ma.  I

Hello... we're talking about an RK05... no fast or trickle charging at 
all. The battery charge circuit consists of a 750 ohms resitor in series 
with a D672 diode and the battery, attached between ground and -15V.


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