Schumacher SI-1275A - Manual (Page 31)

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typically good deep cycle batteries, and they deliver best life performance if recharged
before the battery drops below a 50 percent charge. If these AGM batteries are
completely discharged, the cycle life will be around 300 cycles. This is true of most AGM
batteries rated as deep cycle batteries.
• GEL – The Gel Cell is similar to the AGM style because the electrolyte is
suspended, but different because technically the AGM battery is still considered to be
a wet cell. The electrolyte in a GEL cell has a silica additive that causes it to set up or
stiffen. The recharge voltages on this type of cell are lower than the other styles of lead
acid battery. This is probably the most sensitive cell in terms of adverse reactions to
over-voltage charging. Gel Batteries are best used in VERY DEEP cycle application and
may last a bit longer in hot weather applications. If the incorrect battery charger is used
on a Gel Cell battery, poor performance and premature failure is certain.
When antimony is known to be one of the materials used in the battery’s construction, that
battery is conventional/low maintenance type.
CAUTION
Some low maintenance batteries have a relatively smooth top without any
apparent battery filler caps. If, however, the battery manufacturer/distributor
recommends periodic checking of the electrolyte level and provides access to the battery for
water additions, the battery is probably a conventional/low maintenance type.
CHARGE RATE SELECTOR SWITCH (VOLTAGE/AMP SELECTOR)
Use this switch to set the maximum charge rate to one of the following.
• 2A Slow Charge Rate – Intended for charging small batteries such as those commonly
used in garden tractors, snow mobiles and motorcycles. The 2A rate can be used to
warm or trickle charge larger batteries.
• 6A Medium, and 10A, 12A Fast Charge Rate – Use for charging automotive, marine
and deep-cycle batteries. Not intended for industrial applications.
• 75A Engine Start (model SI-1275A only) – Provides 75 amps for cranking an engine
with a weak or run down battery. Always use in combination with a battery.
VOLTAGE SELECTOR SWITCH (MODEL SI-70MA ONLY)
Use this switch to set the charger to charge a 12 volt or 24 volt battery.
NOTE: These chargers are not recommended for 8 or 16 volt systems.
LED INDICATORS
• Full Charge – When lit, this LED indicates that the battery is fully charged and
the charger has stopped charging and switched to the Maintain Mode of operation
(Automatic charge only).
• Power On – When lit, this LED indicates that there is AC power supplied to the
battery charger.
11. OPERATING INSTRUCTIONS
WARNING
This battery charger must be properly assembled in accordance with the
assembly instructions before it is used.
The charger does not have an ON/OFF switch. The On and Off commands are controlled
by plugging the charger into an AC electrical wall outlet only after the battery connections
have been made. See the warning label on the charger for the correct input voltage.
This charger can be used with the following batteries:
BATTERY INFORMATION
Model Type Number of Cells Rated Capacity
SI-82-6MA Lead Acid (Pb) 6 20 Ah to 100 Ah
SI-70MA Lead Acid (Pb) 6 or 12 20 Ah to 150 Ah
SI-1275A Lead Acid (Pb) 6 20 Ah to 150 Ah
CHARGING
1. Ensure that all of the charger components are in place and in good working condition,
for example, the plastic boots on the battery clips.
2. Connect the battery following the precautions listed in sections 6 and 7.
3. Select the appropriate settings for your battery.
4. Connect the AC power following the precautions listed in section 8. Make sure to place
the charger on a dry, nonflammable surface like metal or concrete.
5. To disconnect, reverse the procedure.