Hello all, What's wrong with the battery for the Rover Rancher 27189 ride on mower i'm restoring? The problem is when i got the mower i found that the 12 volt lead acid battery was flat and i thought all it needed was a overnight trickle charge but when i connected my microprocessor controlled charger and left it over night neither the 50% nor the 75% lights were lit up (yes i checked the charger and it's working and the battery cells had sufficient water).So what is wrong with my battery and will i need to purchase a new battery? p.s the battery is a Exide Endurance.