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Mobile Device Power
145
Disassembly
and Power
4
Figure 4.27 Netbook battery
NiCad (nickel cadmium) batteries originally used in laptops were replaced with lighter
and more powerful NiMH (nickel-metal hydride) batteries. These batteries were replaced with
Li-ion (lithium-ion) batteries, which are very light and can hold a charge longer than any
other type. They are also more expensive. Mobile
phones, tablets, portable media players, and digital
cameras also use Li-ion batteries. These batteries
lose their charge over time even if they are not being
used. Use your laptop with battery-provided power.
Ensure that a laptop that has an Li-ion battery is not
plugged into an AC outlet all the time. Calibrate a
laptop battery according to manufacturer instruc-
tions so the battery meter displays correctly.
Li-ion polymer batteries are similar to Li-ion
batteries except that they are packed in pouched
cells. This design allows for smaller batteries and a
more efficient use of space, which is important in
the portable computer and mobile devices indus-
tries. For environmentalists, the zinc-air battery is
the one to watch. AER Energy Resources, Inc., has
several patents on a battery that uses oxygen to
generate electricity. Air is allowed to flow during
battery discharge and is blocked when the bat-
tery is not in use. This battery holds a charge for
extended periods of time. Another upcoming tech-
nology is fuel cells. Fuel cells used for a laptop can
provide power for 5 to 10 hours.
Do not power on after a temperature
change
Computers are designed to work within a range of
temperatures, but sudden change is not good for
them. If a mobile device is in a car all night and the
temperature drops, allow the device to return to
room temperature before powering on. Avoid direct
sunlight. Inside the computer case, it is usually
40°F hotter than outside.
Tech
Tip
Do not fully discharge a Li-ion battery
Li-ion batteries do not suffer from the memory
effect, as do some nickel-based batteries. Fully
discharging a lithium battery, such as an Li-ion
battery, is actually bad for it. However, most lithium
batteries have a circuit to prevent the battery from
being totally discharged.
Tech
Tip
- Guide to PCs 2
- Complete CompTIA 3
- Contents at a Glance 4
- Contents 10
- Contents 11
- About the Author 19
- Dedication 20
- Acknowledgments 20
- We Want to Hear from You! 21
- Reader Services 21
- It Pays to Get Certified 22
- CompTIA Career Pathway 23
- Steps to Certication 23
- Content Seal of Quality 24
- Why CompTIA? 24
- Introduction 25
- Organization of the Text 26
- Features of This Book 27
- IT work 31
- CompTIA A+ Exam Objectives 32
- CompTIA Exam Objectives 33
- Disassembly 36
- Disassembly Overview 37
- Electrostatic Discharge (ESD) 37
- Opening the Case 41
- Cables and Connectors 41
- Snug connections 43
- Storage Devices 45
- Motherboards 46
- Mobile Device Issues 47
- Reassembly 49
- Preventive Maintenance 49
- Basic Electronics Overview 51
- Electronics Terms 51
- Good connection Broken wire 53
- Power Supply Overview 54
- Power Supply Form Factors 55
- Tech Tip 56
- Purposes of a Power Supply 58
- Power Supply Voltages 60
- Mobile Device Power 61
- Keep Li-ion batteries cool 63
- Power Interface) 64
- Windows power management 65
- Watch the wattage 68
- Solving Power Supply Problems 70
- Adverse Power Conditions 71
- Adverse Power Protection 72
- Surge Protectors 72
- Line Conditioners 74
- Figure 4.32 Line conditioner 75
- Figure 4.33 Sine wave and 75
- Standby Power Supply (SPS) 77
- Electrical Fires 78
- Computer Disposal/Recycling 79
- Chapter Summary 81
- Review Questions 82
- Exercises 85
- External Cables 86
- Computer Case Removal 86
- Adapter Placement 86
- Motherboard 88
- Lab 4.3 Amps and Wattage 89
- Lab 4.4 Continuity Check 89
- Lab 4.5 Pin-Out Diagramming 90
- Lab 4.6 Fuse Check 91
- Lab 4.7 Using a Multimeter 91
- Figure 4.38 AC outlet 93
- GND to hot 120VAC 93
- GND to neutral 0VAC 93
- Hot to neutral 120VAC 93
- +5 volts 95
- +12 volts 95
- Activities 97
- Critical Thinking Skills 99
- A+ Certification Exam Tips 99
- Complete PC Restore tool 107
- FireWire 114
- IRQs (Interrupt Requests) 120
- PBs (petabytes) 129
- Setup program 136
- SSDs (solid state drives) 138
- SSDs (solid state drives) 139
- TBs (terabytes) 140
- troubleshooting 143
- video 145
- Windows 147
- Windows Vista 148
- Windows Vista 149
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