The Handspring Visorphone was a cellular phone attachment marketed for the Handspring Visor series of handhelds. After Handspring's merger with Palm in 2003, it became difficult to obtain replacements.
|2||TEMP||Stops charging if battery temperature becomes too high|
|3||Vin||Lithium-ion battery, 3.6v|
Pin 1 is closest to the center of the battery; Pin 4 is closest to the edge of the battery.
According to Handspring's specifications, 4 to 6 volts can be applied across Vin to charge the battery.