Satmap LiPol battery

Just a quick note on this one... on Friday I reported that the new Satmap battery had arrived. Today we were out for 3 hours using it - on leaving the house the battery indication said 4/4. On arriving back it still said 4/4. Now I know these things lie but with the Road Angel/MemoryMap thing the batteries were dead in 5 hours. I'm hoping this is a sign that the promised 30hr runtime is realistic.