Optimate TM-275 9.5amp Battery Charger/Maintainer/Power Supply (12-13.2V Batteries)


You can order this today, but it will not ship until the first week of October. Sorry for this inconvenience.

This Optimate Lithium charger will quickly charge your battery at 9.5 amps, maintain it at the optimal voltage, and can be used as a power source of 5 continuous amps! For example, you can use it as power supply while programming your aircraft EFIS so you are not draining your battery while you work.


  • POWER SUPPLY (press TUNE Button)

What’s included:

  • 1 x TM-275 charger/maintainer/power supply
  • 1 x battery alligator clips
  • 1 x waterproof quick connect lead with ringlets and SAE connector


SKU: TM-275

High efficiency diagnostic charger and tester for LiFePO4 / LFP batteries. 

Perfect for charging of a high performance 12.8V-13.2V LiFePO4 / LFP battery sized from 2.5 to 120 Amp-hour.

Special features: 

* TUNE mode delivers stable power for vehicle system reprogramming, show room vehicle demo or retaining memorized settings when battery cables are disconnected to fit powered accessories or replace the battery.

* BMS reset, pushbutton activated – for batteries with resettable low voltage / deep discharge protection. 

Battery SAVE mode with BMS reset : 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.

* safeTº : Automatic charge rate adjustment to ambient temperature sensed at the charger. Reduced charging below freezing, no charging if temperature is below -20ºC/-4ºF (can damage lithium batteries).

* Ampmatic : Microprocessor adjusts current to ideal LiFePO4 charge curve to match battery size / conditionfor fastest and most complete charge.

SAVE : Low Volt Start of 0.5V + 3-step low volt SAVE and TEST

  • Recommended for LiFePO4 batteries: up to 120Ah
  • Operation: Fully automatic
  • Charging amps: 9.5
  • Charging volts: 12.8V (nominal) 0.5V – 14.4V (range)
  • Charge time limit: 24 hours (maintenance time: unlimited)
  • Maintain/test cycles: 30 min/30 min (alternating hourly)
  • 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
  • Style: Weatherproof case with wall mounts, with 6ft / 180cm AC supply lead and 6ft / 180cm charge lead ending in SAE connector
  • Operation temperature range: -40°C – +40°C
  • Warranty: 3 years