You can drive up to 155 miles on a full charge in ideal conditions, but it's worth noting that in winter headlamps, wipers and heaters take their toll. (autoexpress.co.uk)
The battery lasts about a day on a full charge with fairly heavy use, but died about halfway through the second day. (technologyguide.com)
The battery life of the headset is also phenomenal at 28 hours on full charge. (indabaa.com)