12V AA Battery Pack with Leads, 8 x 1.5v AA Battery Case Holder, FolioGadgets Battery Storage Box with 5.5mm x 2.1mm DC Plug [4-Pack]

I had zero problems with my four packs. They are simple battery holders, nothing special worth noting but so far I've had a good experience with them. I have them mounted on snare drums so they have been working under plenty of vibration and jostling, so far so good.

3 of the 4 did not hold the batteries in1 of the 4 had a short4 of the 4 are junk