Briggs & Stratton Commercial Series Operator's Manual page 15

To charge the battery, follow the instructions provided by the
battery charger manufacturer as well as all warnings included
in the safety rules sections of this book. Charge the battery until
fully charged. Do not charge at a rate higher than 10 amps.
Check Mower Blade Stop Time
WARNING
If the mower blade does not come to a complete stop within
5 seconds, the clutch must be adjusted. Do not operate the
machine until the proper adjustment has been performed by
an authorized dealer.
Mower blades and mower drive belt should come to a complete
stop within five seconds after electric Power Take-Off (PTO)
switch is turned OFF. If mower drive belt does not stop within
five seconds, see an authorized dealer for repairs.
Change the Engine Oil
1. Run engine until warm.
2. Place the rider on a level surface (refer to Figure 13).
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3. Stop the engine and remove starter insert (A, Figure 13) or
key.
4. Clean oil fill and filter areas of any debris.
5. Remove dipstick (B) and lay on clean cloth.
6. Disconnect the oil drain hose (A, Figure 14).
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