After 4 years of water causing the wood to shrink, the battery spacers were expanded to 1/4".  Extra space is required to account for battery swelling.  Since the days when battery swelling was considered doom, it's become the standard aging process.  Products have extra space to account for battery swelling.  Unfortunately, this battery is down from 5Ah to 4Ah capacity or only 14 mile range.  Over 2400 miles with most of the discharges down to 33% capacity took their tole.