First off you do need to let the system learn the new battery as the BMC logic will still think it has the older battery present. Run the system down to 10% then recharge to 90% then repeat one more time that should do it.
As far as what the battery can offer you for performance, that’s a bit tricky! There are too many factors to give you a value. It should last about the same as what your original battery offered.
The issues you face here is OS your system is running and what extensions you’ve loaded, then the type of apps or games as they will also effect run time. Then are you using your system just above zero C outside or running in 30 C under the blistering sun.
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