Optimate TM-391 6 Amp Battery Charger/Maintainer/Power Supply (12-13.2V Batteries)


The Optimate TM-391 Lithium 6 amp charger that can be used as a charger, maintainer, or as a power supply for your lithium battery with 6 amps of energy. (The power supply mode will give you 5 amps at a constant 13.6V)

What’s included:

  • 1 x TM-391 charger/maintainer/power supply
  • 1 x battery alligator clips
  • 1 x waterproof quick connect lead with ringlets and SAE connector

SKU: TM-391

  • Ultimate LiFePO4 professional level battery charger. High efficiency diagnostic charger and tester for LiFePO4 / LFP batteries.
  • Perfect for charging and seasonal maintenance of a 13.2V LiFePO4 / LFP battery sized from 2 to 100 Amp-hour.
  • SAVE : Low Volt Start of 0.5V + 3-step low volt SAVE and TEST; CHARGING AMPS: 6A (AmpMatic).
  • USE: Indoor / Outdoor (lowest temperature: -40°F / -40°C); STYLE: Weatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector; Weatherproof battery lead & standard battery clip set included.

With 5 Amps of charge current available OptiMate lithium unique multi step ampmaticTM program recharges and balances cells within the battery quickly and efficiently.

OptiMate lithium’s maintenance program delivers current to the vehicle circuitry, protecting and keeping the battery at 100% charge.


IDEAL FOR: Lithium (LiFePO4) 12.8/13.2V batteries from 3 – 72Ah

CHARGING AMPS: 6A (Ampmatic current)

CHARGING VOLTS: nominal: 12.8V range: 0.5V – 14.4V

OPERATION:  Fully automatic

FEATURES: Starts from 0.5V with continuous monitoring / testing of charge acceptance or bad / shorted cell condition. Unnecessary (and unsafe) charging of a bad battery is prevented.

INPUT: Global (100-240V 50-60Hz), high efficiency (CEC listed).

SAVE : Low Volt Start of 0.5V + 3 step low volt save & test.

SAFE: No risk of overcharging. Totally safe for vehicle electronics. Sparks suppressed. Safe for long-term battery maintenance. Automatic shut-down if short-circuited or battery disconnected.

  • Recommended for LiFePO4 batteries: up to 100Ah
  • Programme control: ampmatic microprocessor
  • Input current max: 0.55A at 230V
  • Reverse drain current: less than 0.001A
  • Output current (bulk charge): 0.4A – 6.0A
  • Charge time limit: 24 hours (maintenance time: unlimited)
  • Maintain/test cycles: 30 min/30 min (alternating hourly)
  • Charge retention test: Range: 10.1 – 13.3. GOOD (green) = battery voltage > 13.3V
  • Enclosure classification: IP54
  • Mounting: east direct wall mounting
  • Input & output cable lengths: 2m
  • Lowest temperature range: -40°C – +40°C (safe for indoors and outdoors)
  • Warranty: 3 years limited warranty through OptiMate