Outer Limits 4x4 Board

gday i bought a gq patrol 89 4.2 diesel coulpe of months ago came with new century battery has always started excellent you wouldnt even hear the starter turn over and it would be running now and it is only just starting after about 5 slow winds i dont have a multimeter but the bubble on top of battery is green (fully charged)
would a compression issue cause this or bearing in starter any help much appreciated