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BATTERY VOLTAGE SELECT BUTTON
The Battery Tender
®
charger has a “SELECT” button which allows you to
switch between charging a 12 volt AGM/Flooded, 12 volt Lithium Iron
Phosphate (LiFePO4) battery or a 6 volt AGM/Flooded battery.
The battery voltage can be selected once the charger has AC power
applied and before the charger is connected to the battery.
Once the charger has AC power and is also connected to the battery the
voltage (12V or 6V) selection cannot be changed. To change the mode,
disconnect the battery from the charger.
If the AC power is interrupted the charger will resume charging at the last
battery voltage setting used.
The charger can also detect if the incorrect battery voltage has been
selected or if the battery is defective once the connection has been made
to the battery. One of the Green LED’s (LED 1 or 2) located next the 12V or
6V symbol will flash preventing the charge cycle from starting. In order to
begin a new charge cycle, reset the charger by disconnecting it from the
AC supply as well as the wrong or defective battery for 7-10 seconds.
Reconnect the AC supply and the charger will be ready for a new charge
cycle.
BATTERY TYPE SELECT BUTTON
The Battery Tender
®
charger has a “SELECT” button which allows you to
switch between charging a AGM/Flooded battery or a Lithium Iron
(12 Volt only) Phosphate battery (LiFePO4).
The battery type must be selected once the charger has AC power
applied and before the charger is connected to the battery.
Once the charger has AC power and is also connected to the battery the
battery type selection cannot be changed. In order to begin a new charge
cycle, reset the charger by disconnecting it from the AC supply as well as
the wrong or defective battery for 7-10 seconds. Reconnect the AC supply
and the charger will be ready for a new charge cycle.
If the AC power is interrupted the charger will resume charging at the last
settings used.
AUTOMATIC LITHIUM IRON PHOSPHATE (LiFePO4) RECOVERY MODE
If you try to charge a dead 12 volt Lithium Iron Phosphate battery
(LiFePO4) with a very low voltage, 4 to 8 Volts, the charger will
automatically switch into the Recovery Mode. When in this mode the green
LED (4) will flash, the 12V LED (1) and the amber LED will be solid. If
successful and once complete the charger will automatically switch back to
the normal charge cycle.
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There is a three (3) hour time limit for this recovery process. If not
successful the amber LED (1) and the green LED (5) will toggle back and
forth. It will continue this sequence until the charger is disconnected from
the AC source. If this happens there is a good chance that the battery has
already been damaged due to the low voltage and cannot be recovered.
ATTENTION: The Battery Tender
®
CHARGER HAS A SPARK FREE
CIRCUITRY.
The output alligator clips or ring terminals will not spark when
they are touched together. The Battery Tender
®
charger will not produce an
output voltage until it senses at least 2 volts from a Flooded/AGM battery or
4 volts from a Lithium Iron Phosphate battery. It must be connected to a
battery with the correct polarity before it will start charging a battery.
Therefore, if you plug the AC power cord into an AC power outlet, and if the
output alligator clips or ring terminals are not connected to a battery, and if
you touch the alligator clips or ring terminals together, there will be no
electrical spark.
NOTE:
THE OUTPUT CLIPS OR RING TERMINALS MUST BE CONNECTED TO
A BATTERY BEFORE THE CHARGER CAN PRODUCE AN OUTPUT
VOLTAGE.
TIME REQUIRED TO CHARGE A BATTERY:
The Battery Tender
®
part number 022-0200 charges at a rate of 1.25 Amps
or 1.25 Amp-hours per hour. Therefore, a fully discharged 15 Amp-Hour
battery will take approximately 9½ hours to recharge to 80% capacity.
The Battery Tender
®
part number 022-0209 charges at a rate of 4 Amps or
4.0 Amp-hours per hour. Therefore, a fully discharged 15 Amp-Hour battery
will take approximately 3 hours to recharge to 80% capacity.
WORKING WITH A DEAD BATTERY OR A BATTERY WITH A VERY
LOW VOLTAGE:
If you try to charge a dead battery having a voltage below 2 volts from a
Flooded/AGM battery or 4 volts from a Lithium Iron Phosphate battery, the
Battery Tender
®
charger will not start. An internal safety circuit prevents the
charger from generating any output voltage unless it senses at least 2 volts
from a Flooded/AGM battery or 4 volts from a Lithium Iron Phosphate
battery at the charger output. In this situation, the amber LED will continue
to flash, indicating that a charge has not been initiated.
NOTE:
If a 12 Volt, Lead-Acid battery has an output voltage of less than 9 volts
when it is at rest, when it is neither being charged nor supplying electrical
current to an external load, there is a good chance that the battery is
defective. As a frame of reference, a fully charged 12-Volt, Lead-Acid
battery will have a rest-state, no-load voltage of approximately 12.9 volts.
A fully discharged 12-Volt, Lead-Acid battery will have a rest-state, no-load
voltage of approximately 11.4 volts. That means that a voltage change of
only 1.5 volts represents the full range of charge 0% to 100% on a 12-Volt,
Lead-Acid battery. Depending on the manufacturer, and the age of the
battery, the specific voltages will vary by a few tenths of a volt, but the 1.5-
volt range will still be a good indicator of the battery charge %.
