D battery drops...please help

[mattBLiTZ]

It's been recommended to farm the yellow ladies in downtown or the prisoners in the prison level for drops of this, but I've been at it for hours with no luck. I'm 1/3 but that 1 was during my first playthrough of the game so I don't remember who dropped it.

Surely somewhere there must be an enemy that drops this item more frequently. If anyone can help out that'd be much appreciated, just 2 more D batteries and I'm 100% complete with this game!