> On Mar 14, 2016, at 12:55 PM, Christian Corti > <c...@informatik.uni-stuttgart.de> wrote: > > 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.
That fits with Doug's comment: 20 mA charge current (ignoring the internal resistance of the battery). Interesting that they used a battery; I thought the usual mechanism was a large capacitor, I hadn't seen batteries used for this. paul