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It is perfectly ok to replace your battery with a mAh or Wh rating that is different to your original battery.
Battery capacities are measured in mAh (Milliamp Hours) or Wh (Watt Hours). This figure relates to how much power the battery is able to hold. Batteries with a higher mAh capacity will theoretically last longer without requiring a recharge, allowing you to use your device for longer.
It's impossible to tell from the mAh or Wh rating exactly how long a battery will last as it depends on how much of a drain your device places on the battery and each device is different. For laptops, screen brightness and hard disk activity are examples of things that will effect the drain.
To try and understand how long our battery will last compared to your original battery, it is really quite simple. If your original battery has the same capacity as ours and it lasted for 3 hours when it was new, our battery will also last for 3 hours.
If your original battery has a lower capacity than ours, our battery will last for longer.
Li-Ion batteries have approximately 300-500 charge cycles (charge & discharge), so the more you use it, the quicker it will need replacing.