Static Asset GPS trackersr equire large batteries for parked asset protection usually in situations without access to external power. Their capacity is rated in terms of mAh or Ah (AmpHours) or Wh (WattHours)
The battery capacity is distinct from battery life, which depends on many other factors, including how deployed, physical environment, orientation, frequency of location reporting and the operating mode selected. Most trackers offer more than one operating mode, specifically to extend the battery life by closing down microelectronic sub-systems when not required. The optional modes are listed for each model. The extending of battery life is invariably at the expense of real-time performance options, as the GPS module or the modem may be temporarily off, leading to a time delay in responding to commands.