The battery used to operate starter motors on most
Briggs & Stratton engines above 4 horsepower, is of the
12 volt, lead acid - wet cell type. This type is available as
a wet charge or dry charge battery.
The wet charged maintenance-free battery is filled with
electrolyte at the time of manufacture. The level of
electrolyte can not be checked.
The dry charge battery is manufactured with fully
charged plates. Electrolyte must be added at the time
that the battery is placed in service. Before activating a
dry charge battery, read and follow the manufacturers
recommended procedure. Fig. 66.
BATTERY GAS IS EXPLOSIVE. DO NOT store, charge
or use a battery near an open flame or devices which
utilize a pilot light or can create a spark.
Fig. 64 - Typical Dry Charge Battery
Before installing battery, connect all equipment to
Place battery in holder with a flat base. Tighten
hold downs evenly until snug. DO NOT
Connect positive terminal to positive post FIRST to
prevent sparks from accidental grounding. Tighten
Connect negative terminal to negative battery
terminal. Tighten connectors securely.
Fig. 65 - Typical 12V Wiring Diagram
Physical check - clean if necessary.
Terminal and clamps
(secure - good conditions)
Bring battery to full charge.
Fig. 66- Checking 12V Battery Cells
(Lead Acid - Wet Cell - Dry Charge)
DANGER: DO NOT EXCEED CHARGE RATE OF 1/10
RATING. Consult battery manufacturer for maximum
Use a taper charger (automatically reduces
Fill battery cells with distilled water or tap
water after charging (for batteries that
have been in service).
NOTE: If battery gets "Hot" to the touch or is spitting acid
(gassing) excessively, unplug charger periodically.
With battery fully charged, check specific gravity
readings of each cell with a Battery Hydrometer and
record readings (Fig. 66). All readings should be
above 1.250 (compensating for temperature). If
specific gravity readings varied .050 or if ALL cells
read less than 1.225, replace battery. Attach
voltmeter clips to the battery posts, positive lead (+)
to positive post of battery, negative lead (-) to
negative post of battery. With ignition switch "Off"
press starter button. If ignition switch and starter
switch are the same switch, disconnect spark plug
lead from plug and turn switch to "Start." Voltmeter
should read 9 volts or more while cranking engine.
If less than 9 volts, replace battery.