Hi folks My Air 11" 2013 just recently started showing the warning about the battery "Replace Soon". Since I am going to sell (to buy new 2018 model, of course), I think I should change the battery first. Or should I just leave it as is, with the charge count 1065? On amazon.co.uk, I see batteries from iProPower, Sloda, Anyoneer. I cannot find any info regarding them - how they compare in terms of reliability, quality etc. Any comments would be appreciated.