Woodworker's Journal 2002-26-3, страница 45
Dazed and Confused by New Cordless ToolsBy Sandor Nagyszalanczy Advanced battery and charger technologies bring us better tools, but more confusing choices. Unless you have a CNC router in your shop—your most technologically advanced tools are likely cordless. With all the significant advances in battery chemistry and charger technology, cordless tools have metamorphosed from underpowered playthings (remember the first 7.2 volt drills?) into serious tools most woodworkers use daily. But new technologies always have a darker side: All the different models, features, voltages and kinds of batteries and chargers can lead to serious confusion. Sometimes it seems like you need a degree in advanced electrical engineering before you are ready to make an informed purchase. In this article, I'll try to demystify a few of the more significant developments in cordless power tool technology, offering some insights into the pros and cons of the latest nickel-metal hydride battery packs and micro-processor-controlled chargers. I'll also explore some of the latest cordless tools and advanced features to come down the pike, including some unusual hybrids that run on dual power. Finally, I'll offer a few recommendations of things to consider when purchasing a new cordless tool, just in case you're in tiie market. Nickel-metal Hydride or Nickel Cadmium The biggest buzz in tool and home appliance batteries in the past few years has been the introduction of nickel-metal hydride (Ni-MH) batteries. Currently, two manufacturers make Ni-MH packs for power tools: Makita and Panasonic. Among their touted advantages, Ni-MII cells lack the "memory effect" that can reduce the useful life of a standard nickel cadmium (Ni-CD or "Nicad") battery. This effect occurs when a Nicad pack is recharged before it's spent, thus reducing the total charge the battery is capable of holding. Ni-MH batteries can be topped up at any time without compromising their useful life. 70 June 2002 Woodworker's Journal |
