Best battery for MP3 player

[pepillo]

best battery mp3 player

Hi all, I'm looking for a rechargeable battery for an MP3 player I'm designing.
It should be similar to the mobile phones battery, no matter how many volts (I can use a boost DC-DC converter or a LDO regulator to get the 3.3V).
Questions:
-How much can I expect to spend?
-Size?
-Connector I should use on the pcb?
-Should I use an on-board charger like the MAX1811 or an external charger taken from a mobile phone?

Thanks

 

[faraz101]

best batteries to use in mp3

u can use lipo battery.u can get 3.7v per cell.and it has higher discharge current rate than nicd and nimh.

 

[pepillo]

Thanks for your reply. What about the charger? Would you use an on-board charger like the max1811 or would you use an external charger from a mobile phoneo or similar? Would you use a usb-powered battery charger? Please help me improve my design!

 

[faraz101]

i m using lm317 based constant current charger and then detecting the battery level with op amp.at full charging it turn off the charging but if u dont want to build urself u can buy it from net.search for lipo charger and u will find a lot of variety.
thanx