How to repair my battery

Hi @mzamobheki

You cannot repair batteries.

The best that you can do is either replace them or find out what the problem is on the motherboard if the battery is not charging or supplying power to the motherboard.

Here's the hardware maintenance manual for the laptop.

Go to p.44 to view the procedure to replace the main battery.

Here is a list of all the batteries that are compatible with the laptop.

Battery, 6CELL 2.2Ah, 48Wh, Sanyo Part # 121500047
Battery, 6CELL 2.2Ah, 48Wh, Sony Part # 121500048
Battery, 6CELL 2.2Ah, 48Wh, LG Part # 121500049
Battery, 6CELL 2.2Ah, 48Wh, SMP Part # 121500050
Battery, 6CELL 2.8Ah, L11L6F01 3S2P 62Wh Batt C01 Origa, LG Part # 121500052
Battery, 6CELL 2.8Ah, SM/S L11M6F01 3S2P 62Wh Batt C01 Origa, SMP Part # 121500053.

Search online using the part number only to find suppliers that suit you best.

Given the age of the laptop, if you haven't already done so I suggest that you check the voltage of the back up battery as well - see p.52. If it is <2.6V DC replace it. Usually it is a CR2032 3V Lithium coin cell battery which is commonly available everywhere e.g. supermarkets. The battery type number is printed on the battery itself, if you wish to verify what type it is.