Hmmmm.... Might have to look into the switch opposite..... D'oh@Robbi
Reading about these on BudgetLightForum, these are probably first batch. They often have little foibles. But yours sounds a bit wonky, especially the charge port cap activation. Only way I can make that happen is by accidentally pressing the switch which is opposite.
Charges until green too.
Had mine on charge over night and still flashing red, might try charging the battery separately
Did you try the triple clicks from strobe mode.?