The built-in battery for phones usually lasts about 8~12 hours for tracking, depending on the AccuTracking sending interval settings, cell signal strength/quality.
Tips for Battery Saving:
Power consumption occurs mostly in two places: GPS acquisition and data sending. So to save power:
1) Set the sending interval longer. This will reduce the GPS chipset and network connection activities but according to our test, this won't prolong the battery life much.
2) Better cell network coverage will save the battery since it reduces number of connection failures and retries.