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翠星石 (suiseiseki@freesoftwareextremist.com)'s status on Sunday, 02-Nov-2025 20:27:32 JST 
翠星石@p Yes, if you buy bad quality batteries or use a linear power supply that goes "lmao, lets turn this AC into ~20V pulsating DC with no filtering", the battery will become useless after a year or two. 
The ThinkPad batteries are just 18650s internally.