After over half a decade's service my e-pass' battery died. I've opened it up and see a "SAFT 3.6V LS 1400" battery with 3rd party solder tabs.

The battery is identical to the below minus the solder tabs connecting it to the e-pass circuit board.



The e-pass solder tabs is different from the one that really comes from SAFT pictured below.



The battery costs $9-16.00