Battery Charging Currents of Assorted HP-Calcs & Peripherals

[Sadsilence]

(02-11-2016 11:18 PM)rprosperi Wrote:  Do you have a Topcat Reserve Power Pack (82037A)? I'd be curious what the current is from there?

My results from weekend

HP 82037A Reserve Pack: Ic(dc) = 215 mA ... 200 mA
HP 82028A Reserve Pack (Woodstock): Ic(dc) = 45 mA ... 40 mA

But I feel at least for HP 82037A that is only half of the story as my 2850 mAh rebuilt Topcat pack (discharged in a racing car charger completely before) was fully loaded within 12 h (I checked cell voltages at the same time). That is impossible with NiMH technology.

Useing a truerms DMM (Agilent U1252B) reveals that there is a great AC ripple of 170 mA(!) on charging current, which leads to an effective load current of around 270mA.
Sorry no oscilloscop here. Maybe charging curcuit capacitors within 82037A do not work any more or only partially due to age. Have to check.