User Manual
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battery at a high current rate (amperage) with a charging lead not rated for
the chosen amperage, the wire could get hot, catch re, short out and/or
potentially destroy your battery and the charger. When in doubt, always use
a higher gauge wire (lower AWG number). It is common to see charging leads
constructed of 14AWG, 16AWG or 18AWG wire.
Always refer to recommendations from your battery manufacturer for your
speci c battery type and size before initiating a charge or discharge process.
Do not attempt to disassemble or modify Lithium or Lead-Acid battery packs.
Discharging
The X4 AC Pro discharging functions are for two speci c purposes:
• Refreshing the capacity of a Nickel-based battery that has lost capacity over
time (NiMH or NiCd).
• Reducing the voltage of a Lithium battery for safe storage.
LITHIUM CHEMISTRY BATTERY PACKS SHOULD ONLY BE DISCHARGED
TO THEIR MINIMUM SAFE VOLTAGE, NO LOWER. DEEP DISCHARGING
A LITHIUM CELL WILL DO PERMANENT DAMAGE. REFER TO THE
STANDARD BATTERY PARAMETERS TABLE ON PAGE 6 OF THIS MANUAL
FOR MINIMUM DISCHARGE VOLTAGES.
LiPo & LiHV Charge/Discharge Cycling
Lithium batteries are known to reach full capacity after a break-in period of
about 10 charge/discharge cycles. We do not recommend you use the X4 AC
Pro charger to do this; normal use and recharging will achieve the same results.
If you wish to perform a Lithium break-in on the bench with the X4 AC Pro
discharging to minimum acceptable voltages and performing a balance charge
at 1C maximum rate is recommended. If you choose to break in your Lithium
batteries under normal use, charging at only 1C for the rst ten cycles will help
ensure full performance and service life from your Lithium cells.
Warnings and Safety Notes Warnings and Safety Notes
LiPo LiPo HV LiIon LiFe NiCd NiMH Pb
Nominal
Voltage
3.7V/cell 3.8V/cell 3.6V/cell 3.3V/cell 1.2V/cell 1.2V/cell 2.0V/cell
Max. Charge
Voltage
4.2V/cell 4.35V/cell 4.1V/cell 3.6V/cell 1.5V/cell 1.5V/cell 2.46V/cell
Storage
Voltage
3.8V/cell 3.85V/cell 3.7V/cell 3.3V/cell n/a n/a n/a
Allowable Fast
Charge
≤ 1C ≤ 1C ≤ 1C ≤ 4C ≤ 1-2C ≤ 1-2C ≤ .04C
Min. Discharge
Voltage
3.0-3.3V/cell 3.1-3.4V/cell 2.9-3.2V/cell 2.6-2.9V/cell 0.1-1.1V/cell 0.1-1.1V/cell 1.8V/cell
Standard Battery Parameters
WHEN ADJUSTING YOUR X4 AC PRO CHARGING PARAMETERS, BE
SURE YOU SELECT THE PROPER BATTERY TYPE AND CELL VOLTAGE
FOR THE TYPE OF CELL YOU ARE CHARGING. CHARGING BATTERIES
WITH THE WRONG SETTINGS MAY CAUSE THE CELLS TO BURST, CATCH
FIRE OR EXPLODE.
Charging
Before charging your batteries, it is critical that you determine the maximum
allowable charge rate for your batteries. The X4 AC Pro is capable of
charging at high rates that may not be suitable or safe for your particular
batteries. For example, Lithium cells are typically safe to charge at 1C, or the
total mAh÷1000. A 1200mAh battery would have a 1C charge rate of 1.2
amps. A 4200mAh battery would have a 1C charge rate of 4.2 amps. Some
manufacturers are o ering Lithium cells that can be charged at greater than
1C but this should ALWAYS be veri ed before charging a Lithium battery at
rates higher than 1C. Voltage is just as critical as the charging amperage rate
and this is determined by the number of cells in series, or “S”. For example, a
3S LiPo is rated at 11.1 volts (“S” multiplied by a single LiPo cell with a nominal
voltage of 3.7 volts DC. 3 cells x 3.7 volts each equals 11.1 volts DC).
Connect the battery’s main leads to the charger output: red is positive
and black is negative. Keep in mind that the gauge or thickness of your
charging leads from the X4 AC Pro to your battery must be of an acceptable
current rating to handle the applied charge current. For maximum safety
and charging e ectiveness, always match or exceed the main battery lead
rating when assembling or selecting your charging leads. If you charge a
Warning
Warning