When HOMER calculates the battery life it uses the calculated lifetime throughput, giving a life of 5.1 years, not the suggested one which gives 11 years.   Any suggestions?

HOMER calculates the 'suggested value' of throughput, but the user (whoever creates the battery and adds it to HOMER's library) is free to make the lifetime throughput something other than the suggested value.  That's what has happened in this case.  Whoever created the battery entered a lifetime throughput of only about 1000 kWh even though HOMER had suggested a value of about 2700 kWh.