My HP67 Has Melted!!!

[Paul Berger (Canada)]

(03-20-2020 02:39 PM)Don Shepherd Wrote:  

(03-20-2020 01:50 PM)aurelio Wrote:  Which kind of problem, Don?

The battery compartment door getting too hot and partially melting.

When my original HP power adapter was functional, I could charge rechargeable batts overnight in the calculator and not worry about anything. But then that HP adapter got a short in one of its wires and stopped working. I got a USB charger on Ebay and that seemed to work fine overnight, but then I got a different USB charger and that one caused the melting. So I learned I couldn't trust the USB chargers anymore and bought a third party batt recharger (recommended by Dave Britten) and now I always use that.

Do these USB chargers have any kind of current regulation in them? The charge connectors on a classic are connected directly the battery terminals and and the wall wart limits the charge current.
Paul.