Replacing a 14.8 V battery with an 11.1 V battery won't work with your charger and your laptop will stop working due to the insufficient voltage. If you're looking for a replacement battery for your grandmother's HP 15-G020DX laptop, the 746641-001 should be the one you need. However, replacing an 11.4 V battery with an 11.1 V battery can cause problems because the cells will be overcharged. On the other hand, if you replace an 11.1 V battery with an 11.4 V battery, it should be fine, but the batteries won't be fully charged, so you won't be able to use all of their indicated capacity. The three cells in a (nominally) 11.4 V battery pack are typically charged at 4.2 V per cell, while the cells (newer and slightly different) in a (nominally) 11.4 V battery pack are typically charged at 4.35 V per cell. In conclusion, it is not recommended to replace a 14.8 V battery with an 11.1 V battery as it will not work with your charger and your laptop will stop working due to the insufficient voltage.
However, replacing an 11.1 V battery with an 11.4 V battery should be fine, but the batteries won't be fully charged.
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