I recently updated my (Apple Series Zero) Apple Watch with Apple’s new OS 4.3 update. Immediately after the update my watch proceeded to have serious battery problems. The battery life before the 4.3 update would last all day with no issues at all. After the update my battery life would last only about 4 or 5 hours. I contacted Apple Technical Support and went through all the various diagnostics with Apple Support actually performing them. I also performed all the requested measures to see if it would resolved the issue that they suggested: unpair the watch from your iPhone and pair it again with the iPhone; remove all applications other than what was shipped with the watch; turn off notifications; turn off wake on wrist raise; disable background refresh; reboot the watch; etc… Nothing resolved the issue. Apple Technical Support even admitted that they could find no hardware issue with the watch from the diagnostics. I was then shuffled from the Apple technician to a Apple Support Manager (Lesley). Who went through everything again and was told that I would have to take the watch to BestBuy and pay BestBuy to fix the watch. I am not sure what BestBuy would fix since the watch worked perfectly 100% fine prior to the 4.3 update and terrible after the update. I was next shuffled to Apple Customer Relations (Denis). Every one was wonderfully polite but since there was no hardware failure and it was only a software issue there was nothing Apple could do for me. The only solution that was presented was that I could go to BestBuy and pay BestBuy to look at the watch and see if they could repair it. I find that solution absurd since Apple would not offer to have me send the watch back to Apple the manufacturer of the watch in the first place, who also broke the watch with their 4.3 update! The suggestion that BestBuy would know more than the Apple Support technicians who already performed diagnostics on the watch and agreed on the phone that the issue was related to the Apple 4.3 update. I am very disappointed in Apple. I have been a very loyal customer of Apple since the first iPod, iPhones, iPad and MacBooks were released. I have purchased numerous new models for myself and family of the various devices mentioned. I will have to reconsider my loyalty to Apple and continuation as a customer. If you have an Apple Series Zero Apple Watch DO NOT UPDATE TO 4.3, if you do your on your own. Apple will not support you unless they can diagnose a hardware issue, they will only recommend that you go to BestBuy and pay BestBuy to fix the watch that Apple broke.