Dead battery is replaced and recognized on MacBook Pro – processor speed is still cut Just replaced dead battery on MacBook Pro Late 2011, and it is seen by OS (el Captain) and charging OK. 



Though, processor speed is still being cut and ticks only at 0.8 ghz and Apple Hardware test shows 4xxx error with the battery. 



Did reset to all that possible, any ideas how to make Macbook see battery on a hardware level?
Resolved by using an original battery.