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A couple points.
First, double charging the battery will do nothing except wear out the battery quicker. NiCads don't like being overcharged.
Second, it's virtually impossible to keep the gears in a Bit/MS clean during running. It's just the nature of the beast. The best you can do is try to run it on a very clean surface, and dust it off often.
The time you're getting per charge is about normal. I run my MicroSizers (unmodified) on hardwood floors, and they last anywhere from 3-4 minutes typically.
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