The Optimate TM-291 Lithium charger will charge and maintain your lithium battery with 5 amps of energy so your battery is ready to go when you are!
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: 5A (AmpMatic).
IDEAL FOR: LiFePO4 (LFP) 4 series batteries from 2 – 100Ah; INPUT: Global (100-240V 50-60Hz), high efficiency (CEC listed), fully sealed.
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.
OptiMate™ lithium, the first OptiMate to protect your LiFePO4 battery in a way no other charger did before!
The new OptiMate lithium will protect your investment and guarantee your Lithium Iron Phosphate (LiFePO4 / LFP) battery will perform as advertised for a very long time.
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.
Pre-qualification test: OptiMate Lithium displays the condition of the battery before charging and measures environment temperature. The ampmatic™ charge program is selected according to temperature and battery condition.
Low Volts recovery: The safeTº protection mode controls charging during this sensitive battery SAVE stage, to ensure that an over discharged battery will be correctly and safely recovered. Tests are conducted through-out the SAVE program to determine if the battery has successfully recovered and can advance to BULK CHARGE.
Bulk charge: the ampmatic™ processor actively adjusts charge current to match battery capacity and condition, achieving a complete charge in the shortest time. Progress is tracked against the ideal charge curve for LiFePO4 batteries.
Short-circuited / dead cell check: Charge progress is tracked against the ideal LiFePO4 charge curve, internal damage will be detected and unnecessary charging is prevented of a battery that cannot be recovered.
Absorption and equalization: for 10 minutes the current is delivered in pulses with voltage controlled between 14,0 and 14,3V, aiding cell voltage equalization and improving the battery’s overall power delivery.
Charge verification: the voltage is limited at 13,6V while the ampmaticTM processor monitors the current absorbed by the battery. If this reveals a less than optimal charge, the program reverts to absorption for a further 10 minutes.
Voltage retention test: is conducted for 30 minutes during which no charge current is delivered, with 5 possible test results indicating the battery’s general state of health. A green (voltage > 12,7V) result extends the test up to 12 hours, to check for excessive self discharge or higher than expected power loss through the vehicle’s electrical system.
Charge maintenance: The 12 hour MAINTENANCE CHARGE CYCLE consists of 30 minute float charge periods at a voltage of 13,6V followed by and alternating with a 30 minute ‘rest’ (no charge current) periods. During the float charge period current is delivered only if the battery has lost charge due to connected vehicle circuitry. A refresh cycle may be performed if the charge level has dropped significantly. The voltage retention test and maintenance charge cycle will repeat 24 hours after the start of the very first test and continue to repeat for as long as the charger remains connected. The alternating charge and ‘rest’ maintenance program protects the battery against over discharge by connected vehicle circuitry, making it ideal for indefinite and 100% safe long term maintenance charging.
Recommended for LiFePO4 / LFP batteries
up to 100Ah
Input current max.
0,55A @ 230V
Typical annual energy cost
< €1 (continuous maintenance)
Reverse drain current
less than 0,001A
Output current (bulk charge)
0,4A – 5,0A
Charge time limit
24 hours (maintenance time: unlimited)
Maintain / test cycles
30 min/30 min (alternating hourly)
Charge retention test
Range: 10,1 – 13,3V. GOOD (green) = battery voltage > 13,3V
199 x 71 x 61mm
easy direct wall mounting
Input cable length
Output cable length
SAE-71 fused eyelet set, weather protected SAE-74 clamps set for bench charging