I have a 12V leisure battery that's used to power an electric fence energiser. It had been left without a recharge for a little too long with the result that when recharged it appeared to have one cell with a short circuit as the fully charged voltage was around 12 volts. In for a penny, I stuck it on various chargers, some smarter than others, to see if any of them might bring it back to life. After 48 hours on an Accumate, the voltage, some while after disconnecting the charger, has risen to just over 13 volts whereas a normal battery would be 13.8 volts. So it would seem to have recovered a bit but not fully. I'm assuming that a leisure battery has the same characteristics as a regular cranking battery as the basic chemistry is the same - or perhaps not. Can anyone explain why I'm seeing this voltage?