your battery should be fine
mine was left 5 weeks, then 10 min run, then another month, 10 min run then another 5 weeks!
everytime it started 1st time.
same battery from new, and nearly 150,000 on the clock.
bba
all this trickle charge business I think is a con!
I've a motorhome an I don't trickle this either, and after 5-6 weeks the battery has lost b****r all!