How do I charge or jump start the battery on the T100?
To charge the battery, use only a charger designed for 12V lead-acid batteries, set to deliver a maximum of 10A; charge for a minimum of eight hours if the charger is not automatic. To jump start, connect the positive (+) cable to the positive post of the discharged battery first, then connect to the jumper battery positive post; connect the negative cable to the jumper battery, then make the final connection to an unpainted part of the tractor's engine block — do not jump start using a running vehicle's engine. (Page 25)
From the official Craftsman T100 Series Lawn Tractor manual, page 25
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