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Sep 26, 2014 at 16:22 comment added Jamie Hanrahan With modern laptops (at least the last 15 years) it is not necessary to match voltages. It is very common for manufacturers to offer several different battery packs for a single laptop model. These will differ in the number of cells in the pack. In some cases, the pack with more cells will have a higher terminal voltage. THe laptops cope just fine, due to the use of DC to DC converter circuits (not just regulators). These accept a very wide range of input voltages. And you've never had to match max current either, not that that is a common laptop battery spec.
Mar 2, 2012 at 9:46 history answered user79032 CC BY-SA 3.0