We are a China leading battery manufacturer over 17 years. Our battery covers Lithium,Li-polymer, Ni-MH,Ni-Cd rechargeable battery and battery pack, primary battery,button cell,camera battery,alkaline,etc. Chargers including for AA,AAA,9V,mobile phones,etc. Our iPod battery includes external(PR2500,MP1100) and internal(EC003,UP325385A4H,UP325385A4H,etc). Item  40(3rd) 40G(4rd) 4G(Mini iPod)   PR-2500 17hr     27hr         22hr   MP-1100  21hr    34hr         28hr Please contact me for more specs. Looking forward to your early reply. Best Regards Sam Director/Winbatt Co.,Ltd Marketing Manager of America/Guangzhou Tianqiu Enterprise