as an aficionado once said,
based on ordinary shop instruments, the voltages measured are +/- 10%. so, that measured 13.5 V may actually be in reality, anywhere from 12.15 V to up to 14.8 V.
a large charging voltage can result in excessive bubbling and loss of battery fluid, in the long run. this is probably why the maximum voltage is regulated to 13.5 V only.





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