HP-32E Advanced Scientific Calculator - my first Spice machine

[Dieter]

(11-14-2016 02:50 PM)jebem Wrote:  Instead of the original Ni-Cd based technology, I have used the Texcus Ni-MH type Mignon AA HR6 1.2Volt 2100mAh with solder tags.

Sounds like a common low self-discharge type.

(11-14-2016 02:50 PM)jebem Wrote:  I have soldered the tags on one side to configure the two cells in series and have removed the tags on the other side (facing the battery connector clips).

FTR: there are also battery packs with two cells already welded together.

(11-14-2016 02:50 PM)jebem Wrote:  According to the HP owners guide, the original battery pack would run for around 3 hours of continuous operation.
A quick calculation shows that that claim is correct (700mAh Ni-Cd capacity / 200mA = 3,5hours).

Back in the days of the Spices series, around 1980, there were no 700 mAh NiCds. The regular capacity was 450 mAh, later maybe up to 500 mAh. So with a decent 2000 mAh battery you now can expect 4x the original operating time.

Dieter