Battery Charging Currents of Assorted HP-Calcs & Peripherals

[Hans Brueggemann]

(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?

i don't have the HP82037A, but from the HP-97 service manual, the HP82037A has a charge-current limiting resistor of 12 Ohms, whereas the HP-97 internally uses two resistors in series that add up to 12.9 Ohms while the HP-97 is switched off(!)
on top of that, the HP82037A's LED indicator adds about 18 mA to the charge current, hence i'd guesstimate the charge current of the HP82037A to be 200 mA.