HP35 problem with a calculator, maybe due to a faulty charger

[[kby]]

The Woodstock and later chargers aren’t regulated, but I thought the classic ones were (yes, they can fail; so can a bench supply, although it is probably less likely and also easier to figure that out before it’s too late). Then again, no supply may resist a lightning strike…so, yes outside of the calculator is best. Tough for the 19c as the only thing that fits is an HP-10 which doesn’t have continuo us memory, but also won’t resist a lightning strike and is harder to fix/replace than the 19c.-kby

(03-21-2021 03:50 PM)mfleming Wrote:  

(03-21-2021 09:37 AM)ThomasF Wrote:  as chargers becomes more and more unreliable, do you know the best way to charge battery packs outside the calculator?

The simplest approach is to use a battery pack where the batteries can be removed for external charging. You can modify an existing pack by hand or buy a suitable pack from the previously mentioned supplier. I'd do what Maximilian suggests and toss all chargers in a box