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Get the battery charge on
The pop myth is that National Aeronautics and Space Administration highly-developed the 1st power tools so cosmonauts could cast free, drilling samples of the moon's surface.
But even National Aeronautics and Space Administration says they were invented by Black & Decker in 1961. Three years later, a minimum-torque wrench flew on Gemini missions. In 1968, a core-sample drill went to the moon on Apollo missions. There were no power cords to tangle, and even in zero gravity the tools dug holes and turned bolts rather than turn the astronauts.
Here on Earth, you'll feel the torque in your articulatio radiocarpea as a drill turns. Eliminating that is a costly piece of engineering still reserved for space. But fifty years later, power tool batteries pack a lot more power — for drills,
circular saws, wrenches, leaf blowers, chain saws — and for many jobs around the house, way more than you need.
Increasing power
The beginning power tools were powered by self-contained nickel-cadmium cells. They were heavier and bulkier than corded tools, had much less power, limited run time and extensive recharge time. But, maybe as the novelty if not the cordless convenience, people bought them anyway. In the 1980s 9.6-V tools showed improvement. In the 90s, as manufacturers raced to have the most powerful tools on the market, there were 12- and 14-volt systems. That's the low end of battery packs available on most full-size power tools today.
Capacity has climbed with efficiency improvements mainly from 2 sources: ni-cd batteries (ni-cad) and the more recent li-ion batteries (li-ion).
To save the weight and bulk in check, several companies offering ni-cad tool lines concentrate on 18-volts. Others carry ni-cads at 24-volts. Li-ion models have surged ahead, and several manufacturers at once offer li-ion tool lines with 28-volt power.
Comparisons
Among the biggest differences between the two battery types is in memory effect, a common problem with laptop and mobile phone, too. For example, by recharging before the dewalt battery is depleted, and repeating a recharge approach pattern, the battery basically loses track of its upper and lower limits, and capacity plummets. Nickel-cadmium battery can also lose strength to what's called lazy battery effect — speedily discharging power when disconnected — a problem due to repeated overcharging.
These issues are resolved by li-ion batteries. They have no memory effect.
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Panasonic KX-TG1062M Cordless Phone $207.71 Dect 6.0 Cordless Phone |
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NEC / CORDLESS DECT6.0 Cordless Phone / 730095 $377.27 NEC - CORDLESS DECT6.0 Cordless Phone - 730095 |
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Woman Talking on Cordless Phone $24.99 Woman Talking on Cordless Phone - Photographic Print |
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Man Talking on Cordless Phone $24.99 Man Talking on Cordless Phone - Photographic Print |
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Clarity / AMPLIFIED CORDLESS PHONE / 53702 $62.93 Clarity - AMPLIFIED CORDLESS PHONE - 53702 |
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GE / CORDLESS PHONE BATTERY / 26401 $18.29 GE - CORDLESS PHONE BATTERY - 26401 |
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GE / CORDLESS PHONE BATTERY / 26560 $19.14 GE - CORDLESS PHONE BATTERY - 26560 |
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Phone, Cordless Verizon 200am-2, 2pk $64.99 PHONE, CORDLESS VERIZON 200AM-2, 2PK |
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Panasonic KX-TG4011N Cordless Phone $28.99 1 KX-TG4011N KX-TG4011N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4012N Cordless Phone $48.99 1 2 KX-TG4012N KX-TG4012N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4013N Cordless Phone $61.9 1 3 KX-TG4013N KX-TG4013N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4021N Cordless Phone $38.99 1 KX-TG4021N KX-TG4021N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4024N Cordless Phone $90.69 1 4 Cordless DECT KX-TG4024N KX-TG4024N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4031B Cordless Phone $50.81 1 Cordless DECT KX-TG4031B KX-TG4031B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4032B Cordless Phone $67.74 1 2 Cordless DECT KX-TG4032B KX-TG4032B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4034B Cordless Phone $100.48 1 4 Cordless DECT KX-TG4034B KX-TG4034B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4053B Cordless Phone $100.48 1 3 Cordless DECT KX-TG4053B KX-TG4053B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG6511B Cordless Phone $48.99 1 Cordless DECT KX-TG6511B KX-TG6511B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG7531B Cordless Phone $61.9 1 Cordless DECT KX-TG7531B KX-TG7531B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG7532B Cordless Phone $84.69 1 Cordless DECT KX-TG7532B KX-TG7532B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG7533B Cordless Phone $92.43 1 3 Cordless DECT KX-TG7533B KX-TG7533B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG7534B Cordless Phone $115.83 1 4 Cordless DECT KX-TG7534B KX-TG7534B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4033B Cordless Phone $100.99 1 3 Cordless DECT KX-TG4033B KX-TG4033B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4022N Cordless Phone $57.99 1 2 Cordless DECT KX-TG4022N KX-TG4022N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG4023N Cordless Phone $74.24 1 3 Cordless DECT KX-TG4023N KX-TG4023N Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG6512B Cordless Phone $57.99 1 2 Cordless DECT KX-TG6512B KX-TG6512B Cordless Phone Panasonic Standard Phone www.panasonic.com |
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Panasonic KX-TG1061M Cordless Phone with Answering System $166.14 Dect 6.0 Cordless Phone |
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Panasonic KX-TG7745S Cordless Phone - 1.90 GHz - DECT $270.24 Dect 6.0 Cordless Phone |
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FLX2 10-FLX2-101-POTS - cordless phone $1049.99 Revolabs FLX2 10-FLX2-101-POTS - Cordless phone - DECT + 1 additional handset(s) |
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Panasonic Cordless Phone Battery $12.99 2.4 V DC Panasonic Cordless Phones: KX-TG1000N/1050N KX-TGA100N Cordless Phone Battery HHR-P546A/1B Panasonic Phone Battery Proprietary www.panasonic.com |
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VoiceStation 500 - cordless conference phone $354.99 Polycom VoiceStation 500 - Cordless conference phone - Bluetooth |
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PhoneLynx cellular phone Bluetooth adapter to cordless phone $39.99 Cobra PhoneLynx - Cellular phone Bluetooth adapter to cordless phone |
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Panasonic KX-TG4732B Cordless Phone - 1.90 GHz - DECT - Black $143.42 Dect 6.0 Cordless Phone |
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Panasonic KX-TG4733B Cordless Phone - 1.90 GHz - DECT - Black $178.77 Dect 6.0 Cordless Phone |
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Panasonic KX-TG4743B Cordless Phone - 1.90 GHz - DECT - Black $191.24 Dect 6.0 Cordless Phone |