There seems to be a healthy market for cheap fake and grey-market Moto batteries and chargers.
Continuous blinking red is supposed to indicate the charger will not try to do anything further with it, but if it's still trying instead, you get solid red, turning off briefly every few seconds, no?
What voltage are the batteries presently?
When "zapping", some batteries need you to use less than 8.4V or the present voltage of the cells plus one volt, whichever is less. If you watch carefully when applying e.g. 10V to one of these, you'll see a brief current draw followed by none.