Honeywell H4090-LI(2X) Extended Capacity Battery for Symbol WT4090 Type: Charger Specification: Chemistry : Lithium Ion Polymer Voltage : 3.7 V Nominal Capacity : 4800 mAh Compatibility: Compatible with the Motorola WT4090 Feature: The H4090-Li(2x) is a replacement for the OEM BTRY-WT40IABOH that is used in Symbol WT4090 mobile computers It extends the device's operating time and reduces the total number of batteries needed