I run a 100 amp/hr and a 85 amp/hr
The 100 lasts for about 4 days then put it on charge over night (may do 5 days but don't want to push luck,
the 85 last's for about 3 to 4 days then again on charge over night, Leisure batteries are a must as they are designed to run flat without damaging the battery, keep running a normal battry flat and its cream crackerd very fast..
Then if I happen to run out of power I have a cig lighter adapter to give me a bit of power to finnish the day (leave engine running though, charging leisure battery from vehicle ids not really an option for me as my round is packed within a 5 to 6 mile radus...
alan