Optimate Pro4 Duo, Instructions For Use Manual

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1. SELECTABLE MODES: 
Pb  - LED #1a

 - for 12V lead-acid (STD / AGM / GEL) batteries.

LFP - LED #1b

 - for 12.8V / 13.2V LiFePO

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 batteries.

60' - LED #2

 - A shortened program with charge time limited to 60 minutes or 1 hour, suitable for first charge / 

activation of a new battery, or a quick recharge of a healthy used battery with voltage higher than 11.4V. NOTE: 

If no selection (Pb or LFP) is made prior to connecting a battery for charge, the 60' mode becomes the default 

selection. 

WARNING: Select the correct charge mode for deep discharged Pb / lead-acid or LFP / LiFePO4 batteries 

or LFP / LiFePO4 batteries that require BMS reset. 
2. START - CHARGE A BATTERY 

a) Connect the battery as described in section 

B. CONNECTING TO THE BATTERY.

WARNING: If LED #1a and 1b are blinking together the battery is connected in reverse polarity. Correct the 

connection to continue.

b) The Pb (LED #1a), LFP (LED #1b) and 60' (LED #2) selection indicators will be (dimly) lit. 

To make a charge mode selection press and release the button once for Pb, twice for LFP or three times for 60'. 

Continuing to press and release the button in rapid succession will cycle selection from Pb through to 60'

and 

then back to Pb. If no further selection is made for 3 seconds the last selected mode LED brightens to confirm 

selection is now final. 

NOTE: If no selection is made 60sec. following connecting a battery for charge, the 60' mode activates 

automatically. To change selection, disconnect the battery, wait for the program to reset (confirmed when all 

LEDs flash together twice) and then return to a). Alternatively, turn off AC SW1 to reset all charge banks / 

stations. 

c) The OptiMate now determines the battery voltage. 

Pb & LFP modes: if the connected battery's voltage is 0.5V or higher charging continues automatically, see 

STEP 1 - AUTOMATIC ACTIVATION.  

60' mode: charging continues only if the battery voltage is higher than 11.4V, See STEP 1 AUTOMATIC 

ACTIVATION. 

LFP mode: If the connected battery measures less than 0.5V, as expected for a deep discharged LiFePO4 

battery with battery management system (BMS) that requires a reset, or for a new LiFePO

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battery delivered in 

'sleep mode' (read prior section NEW BATTERIES),

follow the procedure described under MANUAL ACTIVATION 

(STEP 1).

NOTE: If Pb was selected, no further charging is possible. If a lead-acid battery could not recover to at least 0.5V 

when disconnected from vehicle circuitry, it is unlikely the battery will be successfully returned to service. 

d) If no battery has been sensed or MANUAL ACTIVATION was not successful the charger will reset after 5 

minutes. Return to a) above. 

STEP 1 - Charger activation

AUTOMATIC ACTIVATION:

 The program proceeds directly to STEP 2 & 3 and LED #3 or LED #4 will turn on 

depending on condition of the battery and selected mode. 

MANUAL ACTIVATION:

 Required for LiFePO

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batteries with integrated battery management system (BMS) that 

protect against deep discharge, or for a new LiFePO

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battery delivered in 'sleep mode': 

Press the pushbutton until LED #3 starts blinking. Remove finger from pushbutton. 
LED #3 now blinks once per second as a special BMS reset pulse is delivered.When the OptiMate senses the 

battery BMS has reset, LED #3 turns full on, the reset pulses will automatically discontinue and the program will 

continue to STEP 5. 

BMS not resetting: 

LED #3 stopped blinking after one minute and turned off and LED #8 may now be blinking 

indicating a possible ERROR. See list below, each with a 

suggested corrective action

. Correct the error, press 

and release the button to cancel the ERROR indication and then re-attempt MANUAL ACTIVATION. 
1) Battery is connected in reverse polarity. 

Correct the connections and try again.

 2) The vehicle circuitry 

powered by the battery is preventing the pulse from being delivered. 

Disconnect the battery from the vehicle 

and try again.

 3) The battery's BMS or the battery itself may have suffered damage. 

Have the battery 

professionally assessed. 

 4) Temperature as measured at the battery charger is below -20ºC/-4°F or above 

55°C/131°F.

 Follow instructions under section '

LED #8 flashing rapidly- ERROR!'. 

5) A deep discharged 

battery may not hold sufficient voltage to power its own BMS system. 

After cancelling the error, now place and