YUASA 12 volt Black 75AH 740A batteries carried a lifetime warranty. That has now been withdrawn. Such a battery was purchased April 2018 & used in a circa 1929 Alfa Gran Turismo, last used for events October this year. Car has battery isolator switch, along with a clean power battery desulfator, with battery isolator switch utilised when car not in use. Car last taken last October. Check early December revealed battery would not turn engine. Checks of car electrics & battery replacement with old spare started engine, confirming no problem with mechanics. Battery charging with Ring charger, with cut out on charge completion, has revealed drops in volts & amps (show 300), with rapid dropping when charger disconnected. Retailers reported manufacturers voided guarantee. Manufacturers terms on internet contain exclusions including Sulphuration. Battery is a sealed one, so not possible to check battery internals, leaving question whether a battery which has been disconnected from car electrics & with fitted & working Desulfator , should fail in this manner (current amps after charging show 300A, & 14.5 volts, both rapidly dropping when charger disconnected indicative of serious battery fault, with further questions over whether internals including plates manufactured & fitted to standard to meet a lifetime guarantee, against more normal limited lifetime guarantees of between 2-5 years ?