Batteries are the key to any cordless power tool, whether choosing a cordless drill, hedge trimmer, leaf blower, or any other type of cordless tool. Battery voltage is not the single most important factor to consider when choosing cordless power tools. With cordless tools available all the way up to 36 volts, amperage/hour, and battery type must also be taken into account. Many 14.4 volt tools will outperform 19.2 volt tools due to battery type and amp/hr rating.
Battery Rating Basics
Bosch Cordless Tools
Amperage hours and voltage are used to rate a cordless tool battery. Amperage hours are used to determine how long a battery will last and voltage refers to the flow or strength of the electrical current. As I was taught in high school shop class the theory of electrical current is easier to understand if you think of it as water being pumped through a pipe.
Voltage is used to measure the speed at which water is flowing through the pipe. Amperage represents the size of pipe that will be filled to capacity. Amperage hour rates how long the flow can be maintained or how long the battery will last.
As you can see by using this analogy the higher the voltage in conjunction with higher amp/hr the stronger the battery. Cordless power tool batteries are usually available in 1.4, 2.4, and 3.0 amp/hr. The amp/hr rating of the battery can be found on either the side or bottom of most batteries.
Battery Types
There are three types of batteries used in modern cordless power tools.
Ni - Cad ( Nickel - Cadmium ) are the oldest type used and are prone to developing a memory and early failure. Even when properly maintained they are lucky to be recharged 400 times before failure occurs.
Ni -MH ( Nickel Metal Hydride ) are a newer design than Ni - Cad and can develop a memory, though not as quick. The worst issue discovered with this type of battery, the higher the amp/hr rating, the fewer charge cycles before battery failure occurs.
Li - Ion ( Lithium - Ion ) are the newest type available and much better, compact, and expensive than the other two types. Memory is not a problem, and manufacturers claim up to 1,200 charging cycles before replacement.
Charging Time
Is another important consideration when considering cordless power tool batteries. Many older batteries need charging after only an hour or less of work and require six hours of charging time. If you have a lot of work to perform can you afford to wait for your batteries to recharge? There are Lithium - Ion batteries available that only require 15 minutes to recharge.
Stability and Maintenance
With the high cost of replacement batteries for cordless tools it pays to follow manufacturers recommendations for the care and maintenance of these tools. Cordless power tool batteries are just like any other piece of equipment and have an expected service life. When they become worn out and need replacing it is sometimes more economical to replace the entire tool kit. The cost of two replacement batteries is often times more than a new cordless tool with charger and two batteries.
Black Friday Bosch PS31-2A 12-Volt Max 3/8-Inch Drill/Driver 2011 Deals
Nov 27, 2011 01:22:55
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Black Friday Bosch PS31-2A 12-Volt Max 3/8-Inch Drill/Driver Feature
- Compact and Lightweight - Shortest height and head length along with lightest weight make this tool great for overhead/tight area work.
- 3/8" Single Sleeve Chuck - Newly developed compact duty tool to accommodate 90% of common applications with 3/8" single sleeve chuck.
- Fuel Gauge - Easier battery management for continued work.
- 2 Speeds (1st - 0-350 RPM / 2nd - 0-1,300 RPM) - 2X Faster driving and drilling than competition.
- Improved LED Light - Light to illuminate working area
Black Friday Bosch PS31-2A 12-Volt Max 3/8-Inch Drill/Driver Overview
The lightweight design of the PS31-2A is ideal for easy handling in overhead operations and tight spaces, and the Bosch 12-Volt Max Drill/Driver lets you tackle professional jobs with ease. Offering high torque (265 inch-pounds) and the convenience of two speed settings and 20 torque settings, this tool is powerful and user-friendly for fast, efficient drilling and driving. Includes: Bosch PS31-2A 12-Volt Max 3/8" Drill Driver, two lithium-ion 12-Volt Max batteries, 30-minute charger, and carrying case.Black Friday Bosch PS31-2A 12-Volt Max 3/8-Inch Drill/Driver Specifications
Featuring a compact, lightweight design for easy handling overhead and in tight spaces, the Bosch 12-Volt Max Drill/Driver lets you tackle professional jobs with ease. Offering high torque and the convenience of two speed settings, this tool is powerful and user-friendly for fast, efficient drilling and driving. It comes with two batteries, a charger, and a carrying case.
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 Two speeds and a 3/8-inch chuck accommodate 90 percent of common applications. View larger. |
 Compact design ideal for working overhead and in tight spaces. View larger. |
The drill/driver features a compact, lightweight build with a 7-inch head length and 2-pound body. This streamlined design makes the drill small enough to fit into tight areas, and well-suited for continuous overhead work.
Two Speeds with 20+1 Torque Adjustment
Versatile and easy to handle, the drill/driver has a 3/8-inch sleeveless chuck that will accommodate 90 percent of common applications. With 265 in./lbs. of torque, two speeds (0-350 rpm and 0-1,300 rpm), and 20+1 torque settings, you can make precise torque adjustments for accurate screw driving.
LED Light for Improved Visibility
With this small drill/driver you can work anywhere, anytime. An integrated LED illuminates dark corners and low-light areas so your visibility is never compromised.
Warranty Information
The Bosch 12-Volt Max Drill/Driver is backed by a manufacturer's one-year limited warranty.
What's in the Box
Drill/driver, two batteries, charger, and carrying case.
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