> On Mar 16, 2016, at 1:24 PM, Jos Dreesen <jos.dree...@bluewin.ch> wrote: > ... > Additionally the NiCd never keep charge, if , like me, the drives are only > fired up once a year... > > I am thinking of just adding some wiring to an external battery.
I wonder if it might make sense to replace it by a capacitor. For this kind of application, the total capacity is not an issue at all, but only the available current for a fraction of a second. By that measure, it doesn't take all that large a capacitor to do as well as a battery; the difference is that the battery can sustain that current far longer -- which doesn't matter here. paul