I have never done it that way.....However if i want to get it to 100% charge and NOT 96%......."with the birds said" to keep it hooked UP and " turn the battery back on " with IT STILL CONNECTED to the charger to force the charger to get battery to 100% charge.Don’t you turn the battery on like if in the AC & hook up charger.
Set it on, dont bother the lights, connect it quickly to the charger an let it stand for a night. Battery is in deep sleep and needs to get tickled. Hopefully that will breng him back to live again.