4 and 8 hours
Step 8. Allow the correct amount of time for the battery to charge. Most chargers will take between 4 and 8 hours to charge a battery on trickle.. This is appropriate for a mower battery to prevent damage or explosion. Step 2. Disconnect the positive and negative cables from the battery. The mower battery will either have a cable end, like a car, or most will have a bolt that goes through the cable end and terminal to hold the cable on. Either way, the cable can be removed with pliers To charge the battery, plug the transformer into the wall, remove the safety key if applicable and insert the charger plug into the receptacle on the mower; consult your owner's manual for the location of the receptacle -- it's often on the mower handle. A red light will illuminate, indicating the battery is charging.  Published on Aug 12, 2013. Get a replacement battery for your lawn tractor here: http://www.ereplacementparts.com/lawn... This tutorial will show you how to replace and charge the battery on your lawn tractor or riding mower. Helpful items include a socket wrench.  Allow the battery to charge. If the charger does not indicate the battery is fully charged within eight hours, you have a dead battery and will need to replace it. Usually you can revive a battery by charging it for a few hours, but if that doesn’t work, testing it with a multimeter will determine if is it dead or if another part of the electrical system is at fault. Maintaining a fully charged lawn mower battery can extend battery life for four to five years. The battery can be charged at a maximum rate of 10 amps for one hour. If your charger is less than 10 amps, it is recommended that you charge the battery for a longer period of time. As an example, a 2-amp charger may take up to 5 hours to fully charge a tractor battery. Ensure that your charger is set at 12 volts.  a. The battery will need to charge for several hours. Many newer battery chargers will turn themselves off when the battery is fully charged. If your charger does not have that feature, do not let the battery charge for more than 8 hours. The battery does not need to be removed from the machine. 12-volt mower batteries are almost identical to 12-volt car batteries except that they are physically smaller. They both run on the same type of electrical system, but on a lawn mower the setup is much simpler, which is why the battery can be smaller yet still keep a lawn tractor up and running for years.  Another is if you leave the battery in the mower, and you use it 1 time per week for an average of 26 weeks, and only change the oil in the mower one time (ie poor maintenance schedule) then you can't expect the battery to last any more then a couple years. 7 people found this useful.  When a lawn tractor won’t start, it may me be that the mower battery is dead. If so, watch this video from our Sears PartsDirect repair experts or visit us at http://www.searspartsdirect.com/artic... for a guide to charging your riding lawn mower battery. Or call 1-800-437-1673 to speak with a parts specialist. 
http://www.gardenguides.com/90010-charge-lawn-mower-battery.html http://www.ehow.com/how_4892959_charge-lawnmower-battery.html http://www.youtube.com/watch?v=FbHweFEm3LI http://homeguides.sfgate.com/lawn-mower-battery-dead-82521.html http://www.searspartsdirect.com/article/how-to-charge-a-lawn-tractor-battery-video.html https://groundscare.custhelp.com/app/answers/detail/a_id/464/~/dead-or-low-battery http://www.gardenguides.com/88137-charge-12-volt-mower-battery.html http://www.answers.com/Q/How_long_do_you_charge_a_riding_lawn_mower_battery http://www.youtube.com/watch?v=0uSApauf_cQ
how long do i have to charge a lawn mower battery before i can use it