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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.
– Jamie Hanrahan
Commented Sep 26, 2014 at 16:22

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