Fixes/rebalances amount of batteries gained from disassembling some items.

In particular: PDA's gave you 100 extra batteries regardless of whether they were charged or not, which can only be interpreted as them having an entire unused battery hidden inside them?
Wrist watches gave you a whooping 200 batteries when disassembled, which was excessive as it was double their own volume and weight. Changed to a more reasonable 20.
Laptop computers gave only 20 batteries, changed to 200 to make them more desirable as they have no uses apart from being disassembled. 
Fixes #5806