Have a pair of fairly new Crown 6V CR-235’s wired in series for 12V. Every time I charge them up to 100% at around 12.7V (6.35V each), within a couple hours the banks voltage settles down to 12.4V (6.2V per battery). Has anyone else experienced anything like this before? 12.4V is about 80% SOC. It’s been awhile since I’ve used GC2 batteries but don’t recall this behavior before. My previous GC2’s were from Deka. Admittedly, I haven’t checked them with a hydrometer yet and relying on my multimeters.