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Voltage is different for ac adapters and batteries.
For ac adapters, there is a 1v tolerance in relation to what you actually need. For instance, an ac adapter shown with a volts rating of 19v, will be suitable for use with a device requiring 18v, 18.5v, 19v, 19.5v or 20v, but not 17.5v or 20.5v.
For laptop batteries, it is recommended that you use the same voltage as what your laptop needs, anything higher than the rating on your existing battery can potentially harm your machine, however there are exceptions.
10.8v & 11.1v batteries are fine to interchange.
Some 11.1v batteries are interchangeable with 14.8v batteries but this depends on the mAh or WHr rating on the battery also.
If in doubt, call us so we can check and be confident that we supply the correct battery. Do not take the risk of choosing a product which has different specifications to your existing battery where voltage is concerned as you may not only damage your device, but you may also void your warranty on your device and also void the warranty from us.