Hi all I haven’t contributed much to this forum , mainly because I am not very knowledgeable with drones but after reading the article written by Mr Booth on batteries,I followed his instructions to fully charge the battery then start spark as normal take off about 3ft let drone hover until battery drops just below 10% now both batteries are performing perfectly, I have flown both twice now but I stayed close to home and kept low . Both batteries we’re buggered spark would only last a few seconds and would show low battery and virtually fall so I hope this will help other members. Best Regards Engie.