iAudio - JNC and Cowon PPCW0401 PPCW0504 battery 3.7v 1100mAh.
Replacement iAudio - JNC and Cowon music player battery SSF-M3 M3 M M5L X5 X5L X5V 20Gb Portable HDD Player to replace PPCW0401, PPCW0504 3.7v 1100mAh batteries.

Charge your new MP3 player battery when it arrives and first use. if there are long periods that it is not being used then a recharge every five weeks will be required to keep the cells in good order.

Replaces following battery serial codes:
PPCW0401
PPCW0504.

Fits Following iAudio / JNC / Cowon media center / MP3 Players:
I-Audio M5 ML5 X5 XL5 X5V
JNC SSF-M3
Cowon M3
Cowon iAudio X5 M3.

Battery Type: Li-ion
Battery Voltage: 3.7v
Battery Capacity: 1100mAh.
The Ah is different on my old battery, can I still use yours?
The Ah (Amp Hour) Rating is the storage (or fuel) of the battery, the higher it is the longer the battery lasts between charges, bit like petrol in your car so a higher or lower one makes no different to the performance, just the length of time you can use the battery for between charges.