The Optimum Charger charges the batteries very quickly

Torquey! The included BTD141 impact driver seems strong; rated at 1,330 in.lbs of torque, it translates to about 40 ft-lbs of torque, easily sufficient for a wide variety of needs. The BTD141 is powerful enough to handle brake jobs, lugnuts, and other jobs where you would normally want to use a breaker bar to loosen the bolts. In other words, most work you would need to do at home on your automobile.

Torque can't be set to a specific number, so the BTD141 is no replacement for a torque wrench. However, torque is variable, based on how hard you pull the trigger. I would definitely not use the BTD141 for final tightening of any bolts or nuts on vehicles or engines (keep your torque wrench handy for that), but use it on computer server racks without hesitation. It drives bolts in very quickly and battery life seems to hold up well.

Convenience The BTD141 impact wrench is surprisingly light, very compact (fits nicely into very tight spaces), and packs a punch. Like the BHP452, the driver includes an integrated LED which does not replace your regular work light, but does allow you to work in tight spaces in a pinch where work lights would be cumbersome or impossible.

Optimum Charger

The Optimum Charger charges the batteries very quickly; its stated time is 30 minutes, but for a deep cycle seems to be closer to 20. One thing about this charger is it includes a fan to cool the 3.0Ah batteries via the cooling vent during the charging process, and communicates with the battery pack's monitoring circuit to track temperature and voltage, and varies the charging rate accordingly. After a full charge the batteries are barely warm, whereas Makita's older NiCD system results in hot battery packs after a full charge.

By implementing this cooling, the lifetime of Li-Ion based batteries will be greatly extended, so this is a great engineering choice on Makita's part.

However, the charger is quite large, given the need to accomodate cooling fans and resultant internal ductwork. The charging process is quiet though; the fans are noticeable but only slightly more so than your typical PC. The charger by default does notify you by sound when the charging process is complete, and the tone is user-configurable, or you can disable the sound altogether.

The Cons

I can't find much negative to say about the tools. Here is what I find issue with:

BHP452Z Cons

* A magnesium or titanium case would have been nice. However having had no issues with the plastic construction of my almost-20-year-old 6095D, this is a really minor nitpick.
* An on-board bracket for at least one driver or drill bit would have been nice.

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