The internal resistance of 3 battery capacity are closer will be better. Do not mix the good battery and the battery. The capacity of the battery internal resistance is closer will be better. Due to different producing batches product details might be...
HP Li-Ion 2500mAh Batteria (Battery 3 cells 26 WHr 2.5 AH - Li-Ion 2500mAh Batt
2-Power CBP3590A ricambio per laptop Batteria (Main Battery Pack 11.1V 2500mAh)