3.70V,1100mAh,Li-ion,Hi-quality Replacement Pocket PC Battery for Dell Axim X50, X50v, X51, X51v, This PDA battery can replace the following part numbers of Dell: 310-5964, 35h00056-00, 36485, 451-10201, HC03U, T6476, T6845 : Amazon.in:
Dell Axim X50 review | TechRadar
Replacement Dell Axim X50, X51 Battery | Battery Mart