Please read the instruction carefully before using

Brand new toshiba PA3523U-1BAS battery comes in a discharged condition and must be charged before use. Upon initial use (or after a prolonged storage period) the battery may require three to four charge/discharge cycles before achieving maximum capacity.
Do not try to modify or disassemble the toshiba PA3523U-1BAS battery pack because this may cause damage to it.
If the toshiba PA3523U-1BAS notebook battery will not be in use for a month or longer, it is recommended that it be removed from the device and stored in a cool, dry, clean place.
A charged battery will eventually lose its charge if unused. It may therefore be necessary to recharge the PA3523U-1BAS battery after a storage period.
If the laptop battery can't work well, please check twice to confirm that whether the battery is defective or not; If the problem still remains, please contact our customer service representative ASAP and let us know the Problem in detail. We will do our best to serve you.