apple battery sizes

ipod -   shuffle ---- G2 ----  616-0278 --- 23.5*23.5*3mm ---- 3 gm --- 200mah
ipod - shuffle ---- G1 ---- 616-0212 --- 20.5*31.5*5.5 ---- 6-12 gm --- 250mah
ipod - nano  ---- G2 ---- 616-0407 --- 61.00 x 22.00 x 2.00 mm --- 50gm ==400mah