ThinkPad Battery Safety

1. ThinkPad Battery Safety mkohut@us.lenovo.com

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.

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

4. Lower System Temperature Lower System Temperature = Safer and More Comfortable Systems 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. Competitor Typical ThinkPad Microprocessor controlled heat pipe provides super efficient heat transfer from CPU and helps keep system temperatures low

5. Enhanced Charging Algorithms Proprietary Charging Algorithms Maximize Battery Life ThinkPad notebooks charge batteries at rates designed to keep batteries in a safe operating temperature and maximize battery lifespan. ThinkPad Power Manager actively manages batteries, providing real-time information and utilities to maximize battery health.

6. Battery Safety Design Summary • Industry 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