text: Nickel–metal hydride batteries (Ni-MH) largely replaced Ni-Cd batteries in the early 1990s. They replaced the metallic cadmium electrode with a hydrogen-absorbing alloy, allowing it to have over two times the capacity of Ni-Cd batteries while being easier to recycle. Their heyday in computer equipment was in the early- to mid-1990s. By 1995, most motherboard manufacturers switched to non-rechargeable lithium button cells to keep the BIOS chip powered. Lithium-based battery packs replaced Ni-MH packs in all but the lowest-end laptops by the early 2000s.
  The practical shelf life of a Ni-MH is roughly five years. Cylindrical jelly-roll Ni-MH cells, like the ones used in 1990s laptop battery packs, discharge at a rate of up to 2% per day, while button cells like the ones used in motherboard batteries discharge at a rate of less than 20% per month. They are said to leak less frequently than alkaline batteries but have a similar failure mode.
  Ni-MH leakage can be effectively neutralized with lemon juice or distilled white vinegar.