i want to get set of 18 volt cordless power tools, but i am too cheap to buy them all at once. Can i buy them from differnet brands and still expect the batteries to be interchangable?

I need a batterey for Delta 18 volt cordless drill

I have a 19 volt Craftsman cordless drill which I have had for about 4 years. The original batteries needed replacing so I just bought a new Craftsman 19 volt battery for replacement. However, when I used the drill recently after about 15 minutes it started to emit a slight burning smell (no smoke) from the drill. I was not using the drill as often when the original batteries weakened, but when I did there was no smell. Could it be that the increased power from the new battery is causing it to burn off dust that could have settled inside the drill or is there a possible problem with the drill itself?

I'm just trying to find out if a alternator off a car would recharge a 12 volt cordless drill battery?

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Makita 18V Compact Lithium-Ion Cordless 1/2 In.
or.
Bosch
18-Volt Litheon Cordless Drill
Which one do you think is better quality and works better,thanks.

Available at: www.tradecounterdirect.com • Dewalt 18 Volt Nano Combi drill. • Nano Li-ion battery technology providing over 2000 charge cycles, more than double that of a Ni-Cd/Ni-MH packs. • 2-year warranty on battery. • Backwards compatible, accepts Li-ion Ni-MH and Ni-Cd batteries. • Powerful combination tool for impact drilling, rotary drilling and screwdriving applications. • New frameless motor to reduce size and weight without compromising power. • 13mm heavy-duty keyless chuck, with automatic spindle lock. • 2-speed gearbox with variable speed trigger. • Supplied in carry case with universal charger.