BATTERY
Types of power tools
Power tools power from the input plug-in can be divided into two kinds with the electrical storage.
By using the function can be divided into:
Metal cutting power tools
Grinding power tools
Assembly power tools
Metal cutting power tools
Use circular saw blades, saw blades, abrasive manner, etc., the metal material (such as: iron, aluminum, steel, etc.), non-metallic materials (such as: wood, plastic, etc.) for cutting operations.
Using places: the metal processing, wood processing plants, decorating houses and other places.
Grinding power tools
Use wheel, belt, disc, etc., on the material for grinding, polishing, grinding and other activities.
Using places: wood processing, metal processing plants and so on.
Assembly power tools
A drill
Uses: with a variety of accessories, things work in different materials for drilling, loading and unloading various types of screws, nuts, sanding, polishing, waxing, etc..
Use: the need to drill all kinds of situations apply.
Second, the electric wrench
Purpose: Dedicated to all types of screws and nuts of the loading and unloading operations.
Use: the need to disassemble or assemble a variety of situations apply.
Cordless basis for the work described
The basic principle of the battery
 |
 |
Nickel-cadmium, nickel metal hydride battery core = 1.2 volts each
10 = 12 volt battery core
20 = 24 volt battery core
Lithium core = 3.6 volts per cell
4 core = 14.4 volt battery
10 = 36 volt battery core |
Common market type of power tool batteries
Nickel-cadmium: a large discharge capacity of the moment, the big power discharge, the voltage drop is relatively flat.
Ni-MH: robust and feature rechargeable, Ni-Cd memory effect problem is more better.
Lithium: light weight, no memory effect advantages. Lithium into lithium-ion and lithium polymer batteries into two categories.
Note: Nickel-cadmium batteries or lithium batteries just kind of general. Is like car SUV ... The same types of batteries because of the different batteries have different chemical composition and performance.
For example: lithium iron phosphate battery also referred to as "lithium batteries."
Battery memory effect
Occur due to repeated some of the battery charge and discharge due to incomplete, resulting in a temporary capacity of the battery decreases.
The effect of early use of nickel-cadmium batteries for the most obvious, each charging the negative electrode has the role of hydroxide and cadmium, a metallic cadmium deposited on the negative electrode surface discharge, the negative electrode surface of the metal cadmium, cadmium hydroxide formed by the reaction this is dissolved - deposition reaction; when the discharge is incomplete, the cadmium metal electrode will gradually produce large crystals after leaving the chemical reaction is hindered, leading to capacitance reduction in the real performance, namely the so-called [] memory effect generated reason.
 |
New Battery
Core of each cell were filled with sufficient |
 |
Used several times the battery
Core due to charging or discharging the battery is not fully produce the so-called "memory effect"
Making the battery life reduced |
How to choose cordless power tools
Battery of three basic principles of assessment
Voltage (volts): Like a car engine size, represents the "power."
Amp Hour (Ah): Just like your car's tank size, represents the "life force."
Cycle times (number of charge cycles): The battery can be charged many times. The battery "life."
Ni-Cd (nickel cadmium)
Multi-user
Application of high consumption of
Reasonable life
Reasonable life
Reasonable price |
Lithium (lithium)
Suitable for the upside down face
Lighter
Smaller
Higher prices |
Cordless power tools, "Power" chapter
 |
Power (power head) = volts + high-performance motor and gear drive
When increasing the number of volts, the power head and also increases
Or when the motor, transmission, switching, etc. .. the design of more sophisticated mechanical devices, the power head will increase
|
Please note: the battery will not affect the chemical properties and equipment of the power head and the speed (either nickel cadmium or lithium batteries)!
Will affect the chemical characteristics of the battery is the battery size, weight and endurance
The same chemical properties, volts and amp-hour nickel-cadmium, lithium batteries will have the same power head and gear head |
Cordless power tools, "life" articles
Life (block head) = volts + battery + motor gear drive capacity
|
Battery Specifications |
|
|
|
|
Voltage volts V |
Battery capacity (ampere-hours Ah)
|
Battery life (Watt hours)
|
|
|
12V |
2.0
|
24
|
|
|
18V |
2.4
|
43.2
|
|
|
36V |
2.4
|
86.4
|
|
Because different applications will have different power consumption, it is not easy to get the number of batteries can drill a hole.
For example: the same 18V, 2.4Ah the drill in drilling wood or metal substrate will have a different life.
|
