I've replaced the capacitor/battery in a Seiko Solar Chronometer (V172-0AB0), the watch restarted and I placed it on a window sill for 6 hours to ensure a full charge. However it then only ran for a couple of hours after removing it from the window sill. Replacing it in full sun causes it to start again but clearly is not charging the capacitor which leads me to concude that either the new capacitor is faulty or the watch is not charging it effectively. Any other suggestions/ideas as to a solution please? Thanks.