from Lenovo website: See (1)
CAUTION: There is a danger of an explosion if the backup battery is incorrectly replaced. The lithium battery (IBM P/N 02K6572 UL-recognized component [file no. MH12210]) contains lithium and can explode if it is not properly handled or disposed of. Replace only with a battery of the same type. To avoid possible injury or death, do not: (1) throw or immerse the battery into water, (2) allow it to heat to more than 100°C (212°F), or (3) attempt to repair or disassemble it.
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