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| © 2006 Lenovo Page 2
Battery Safety
• Is it possible to design a safer battery? – No battery design can be 100% failure free in all circumstances. In the rare
circumstance that a battery does fail, customers should know that Lenovo designs its battery packs to fail in safe ways.
• How does Lenovo design its battery packs? – Lenovo uses only batteries from well known manufacturers who must
conform to Lenovo’s extensive qualification procedures. Further the battery packs which Lenovo uses are carefully designed to reduce the likelihood of battery failures cascading into a significant event like a fire or smoke. Lenovo goes well beyond the industry norms when it designs its battery packs to be as safe as possible. Lenovo also avoids implementations which can stress a battery. Lenovo battery pack utilizes multiple independent circuits that actively monitor battery status.
| © 2006 Lenovo Page 3
Stringent Battery Quality Requirements
• Lenovo only works with suppliers who meet our stringent quality levels• Lenovo has been continually active in the industry to promote safer
battery technology. – Lenovo has pushed battery vendors to include improvements like adding
safety wrap around each battery cell that are now industry standard
• Lenovo will only use battery cells from the vendors that we have identified as meeting high standards for safety. No other vendors are used
| © 2006 Lenovo Page 4
Lower System TemperatureLower System Temperature = Safer and More Comfortable Systems
Typical ThinkPadCompetitor
Microprocessor controlled heat pipe provides super efficient heat transfer from CPU and helps keep system temperatures low
Lenovo designs its own thermal solutions for ThinkPad notebooks. As a result, Lenovo can better control the temperature and flow of heat as compared to competitors who buy generic thermal solutions that have not been optimized for their specific systems.
This helps keep reliability high because Lenovo can design for the specific system specifications to help keep critical system components running cooler, like batteries.
| © 2006 Lenovo Page 5
Enhanced Charging Algorithms
ThinkPad Power Manager actively manages batteries, providing real-time information and utilities to maximize battery health.
Proprietary Charging Algorithms Maximize Battery LifeThinkPad notebooks charge batteries at rates designed to keep batteries in a safe operating temperature and maximize battery lifespan.
| © 2006 Lenovo Page 6
Battery Safety Design SummaryIndustry Standard for Battery Safety (IEC 60950)
• Thermal and voltage safety• Over charging protection• Individual battery cell protective wrap• Varying levels of on-board battery management CPUs
ThinkPad Standard for Battery Safety• Advanced battery safety CPU detects and prevents the following additional battery fault conditions:
•Multi-temperature protection
•Multi-Over/under voltage protection
•Multi-Over charging current protection
•Multi-Over discharging current protection
•Cell imbalance detection
•Leading the industry to use safer battery design and chemistry
• Only choosing suppliers that will meet high standards for safety
• Designing systems with lower system temperature which enhances reliability and safety
•Enhanced charging algorithms to maximize battery longevity and safety
