I purchased a mp3 frm local market , but it hardly plays for 10 - 15 min and then
I had to recharge it .I found that it uses cheap tiny rechargable battery ,
which was nothing but scrap , so I thought to replace it a higher amps battery
so that it runs for hours

Step 1: .

Open the mp3 player , carefully , it will be generally just glued at bottom , so a little effort and it will open

Step 2: .

Once you open it , you will find the battery , and speaker wires , disconnect them.
you will be amazed to see how you were cheated with this tiny battery

Step 3: .

Now you have to get the very thin wires to get soldered the speaker and your new battery (3.6 volts , ni mh , 1ah ) or any spare battery which you have , only thing you take care is , voltage , must be 3.6 volts

so get the thin wire , best is you cut any usb data cable , and you will get best cable there

Step 4: .

Solder carefully the new battery , and also connect the speakers , (little bit longer wire )

Step 5: .

Put back the mp3 case , please be careful while taking out the power wire , i took it out from the usb gap
connect the battery and power on

Step 6: .

Now the mp3 player is ready , you secure the battery ,
i tied to the device itself as it is handy and ready to use
Now my mp3 runs for very very long with one charge