I had the same problem I am very mad at RadioShack
I had the same problem I am very mad at RadioShack
This is one reason I never intentionally put alkaline batteries in anything that a power cord can be attached to, only rechargeables. And if there is the 1 in 10 years that I have to use alkaline, I never go near a power cord. Never assume.
If you never use rechargeable batteries and only use alkaline batteries why not just set the charge time to 0. That way even in the event that the metal on the black holder may touch the charging PIN it would still be a non-issue as the charger would be completely disabled.
Hopefully you will retract your suggestion after reading this information from Don Starr, the author of the firmware for the PSR-500 "family" of scanners.