Iridium BAT21601 9555 Li-ion battery replaces older Iridium battery BAT20801 Li-ion battery for Iridium's 9555 satellite telephone. 

The Iridium 9555 Li-Ion Rechargeable Battery is designed to be charged while inside the Iridium 9555 satellite phone. It can also be used as a replacement for the 9555 battery or as a spare battery for extended travels.

BAT21601 3.7V 2200mAh Li-Ion battery for Iridium's 9555 hand held satellite phone.