Will a battery work in my device even if the mah is higher or lower than the original

In general, a battery with a higher mAh rating will be able to power a device for a longer period of time before needing to be recharged, and a battery with a lower mAh rating will be able to power a device for a shorter period of time. However, it is possible to use a battery with a different mAh rating than the original battery in a device, as long as the battery is compatible with the device and meets the voltage and physical size requirements.

Using a battery with a higher mAh rating than the original battery may not necessarily cause any problems with the device, but it is important to be aware that the device may not be designed to fully utilize the additional capacity of the higher mAh battery. In this case, the device may not run any longer on a single charge than it would with the original battery, and the higher mAh battery may not provide any additional benefits.

Using a battery with a lower mAh rating than the original battery may result in the device running out of power more quickly, as the battery will not be able to store as much energy as the original battery.

It is generally recommended to use a battery with the same mAh rating as the original battery, or to use a battery with a higher mAh rating if one is not available. It is important to consult the documentation for your device and to follow any guidelines provided by the manufacturer for selecting and using replacement batteries.