[time-nuts] HP 105B: Modern replacement for NiCad battery pack?

Gregory Beat w9gb at icloud.com
Fri Jan 5 15:40:23 EST 2018

Ulf -

Yes, this question, about the HP 105B, was asked in September 2016.

In Europe, it is virtually impossible (RoHS) to acquire NiCad batteries for past decade — unless you are an exempt entity.

IF you desire a DIY Build, examine these three (3) popular ICs for charger management.
Application Notes for these parts have typical circuits.

TI BQ24401 
Switch-mode NiCd/NiMH Battery Charger

Maxim (old Dallas Semi) DS2715
NiMH Battery Pack Charge Controller

Analog Devices (old Linear Tech) LTC4060
Standalone Linear NiMH/NiCd Fast Battery Charger

Jameco sells the old Linear Tech charger ICs.
> I am looking for a modern replacement for the NiCad battery pack used in the HP 105B. > One such 105 that I salvaged have been standing on a shelf with the batteries "happily boiling away".
> So, what kind of chemistry would be possible to use without too much re-design of the charging circuitry?
> Ulf Kylenfall, SM6GXV

Sent from iPad Air

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