This is the spec for the elusive Symbol battery with the specs:
Symbol Battery: 55-060112-86
Motorola Battery: BTRY-MC30KAB02
(Original Manufacturer: Sanyo)
Battery for the Symbol MC-3000 series scanner
(MC-3070 Imager)
Lithium-Ion (Li-Ion) 3.7V 4400mAh
Revision: B