Siemens EBA-520 Battery for SL55 is a Li-Ion Polymer Battery 500 mAh.

Siemens EBA-520 Battery for SL55 is a replacement battery for the SL55. You can use it to replace your worn out battery or to use it as a second battery to give your SL55 greater battery life while you are away from a charger. The 500 mAh gives up to 200 hours stand-by or up to 210 minutes additional talk time.