Sabisu Net 5 Nice that this exists for this tiny watch because without it during rain or excessive sweating the battery appears to drain much faster.Hardly can run 20km without experiencing a warning "Battery Low!" then.Guess that is due to current leakage between the open port contact points.Bad of Garmin that there wasn't any cover included beforehand.Durability of this part cannot tell yet - I guess that will be fine with another 9 pieces :)The charge port cover definitely helps to keep the watch logging Marathon and Ultra marathon tracks without the battery getting out of juice prematurely.5 stars for that!