The author repaired two ten-year-old rechargeable bike lights by replacing their degraded batteries. Using a soldering iron at a local makerspace, they desoldered the old LIR2477 batteries, ordered replacements from AliExpress, and reassembled the lights with silicone glue.
The Raspberry Pi Foundation implemented bootloader changes limiting RAM upgrades on Pi 4 and Pi 5 boards, but the author argues this is not problematic since the restriction is easily bypassable by downgrading the bootloader—a task within reach of anyone capable of performing RAM upgrades themselves.