I recently bought a motordrive and high power nicad pack FN for my new F-1. The pack does take a charge, but it doesn't last for very long, so I suspect the nicad cells inside are at the end of their life. When I shake the pack, I can hear things moving inside, so I suspect that its a set of discrete cells inside. Has anyone taken one of these packs apart and rebuilt it? I've rebuilt a Quantum battery pack before and that was easy, so I'm wondering if there is any trick to pulling apart the nicad pack?