Ultimatron ULM-12-300 12.8V 300Ah LiFePO4 Underseat Battery

Brand: Ultimatron
Model: ULM-12-300
SKU / part number: ?
Category: Batteries

chargedreviews.com/batteries/ultimatron-ulm-12-300

Energy and chemistry

Nominal voltage	12.8 V[1]
Rated capacity	300 Ah[1]
Nominal energy	3.84 kWh[1]Calculated
Usable energy	?
Chemistry	LiFePO4[1]
Cell format	?

Charge and discharge

Continuous charge current	100 A[1]
Continuous discharge current	200 A[1]
Maximum charge current	150 A[1]
Maximum discharge current	?
Peak charge current	?
Peak discharge current	600 A[1]
Continuous output power	?
Peak output	?
Maximum charge voltage	14.6 V[1]
Charge cutoff voltage	14.6 V[1]
Discharge cutoff voltage	10 V[1]

BMS and communication

BMS continuous current	?
Communication protocols	?
Wireless monitoring	Yes[1]
Inverter compatibility	?

Operating temperature

Charging temperature	0 to 50 °C[1]
Discharging temperature	-20 to 75 °C[1]
Storage temperature	-5 to 35 °C[1]
Self-heating	?

Mechanical and mounting

Dimensions	430 W × 160 H × 320 L mm[1]
Weight	35 kg / 77.16 lb[1]
Terminals	M8[1]
Mounting / format	?
Enclosure rating (IP)	IP65[1]

Installation (from the manual)

Torque

Main terminal torque	9 to 11 N·m(79.66 to 97.36 in-lb^*)[1]
Communication terminal torque	?
Ground terminal torque	?

Not in the manual: Conductors, Protection, Clearances and orientation, Grounding, Communication

System limits

Maximum parallel units	4 units[1]
Series connection	No[1]
Maximum system energy	?

Page 1 of 2 · Installation values · ? means nothing is recordedAggregated, often community-reported information, not official documentation. Do not rely on it for installation, purchase or compliance decisions; always confirm values with the manufacturer’s official documentation. Charged Reviews accepts no responsibility for errors.

Charged Reviews · Quick reference

Ultimatron ULM-12-300 12.8V 300Ah LiFePO4 Underseat Battery · ULM-12-300

Warranty

Warranty term	5 years[1]
Warranty cycle limit	?
Warranted throughput	?
Capacity retention	?
Cycle rating	?
Estimated throughput	?
Coverage starts	?
Coverage conditions	?
Remedy	?
Labor and shipping	?
Transfer to another owner	?
Registration	?

Certifications and listings

UL 1973	?
UL 9540	?
UL 9540A	?
UN 38.3	?
IEC 62619	?
CE	?

Documents and sources

Ultimatron France technical sheet (EN): ULM-12-300 LiFePO4 Smart BMS lithium batteryOfficial datasheet · Revised Not stated · Checked Oct 27, 2026https://ultimatron-france.fr/wp-content/uploads/2024/04/ULM-12-300-Datasheet-Ultimatron-12V300Ah-EN.pdf
Ultimatron France downloads page (Téléchargements), October 27, 2026 captureOfficial product page · Revised Not stated · Checked Oct 27, 2026https://ultimatron-france.fr/telechargements/