⚡ High-Burst LiFePO4 Architecture: Engineered for Uncompromising Engine Ignition
As modern automotive and marine systems demand higher electric loads, traditional lead-acid batteries fail under high internal resistance and severe cold voltage sag. The HiMAXBATT 12.8V 50Ah starter battery addresses these challenges by integrating high-rate prismatic LiFePO4 cells in a 4S series configuration within a standard DIN H6 / LN3 (278×176×189mm) fire-retardant ABS enclosure. Engineered as a direct drop-in replacement, it utilizes standard SAE brass taper posts (POS Ø19mm, NEG Ø17mm) to fit seamlessly into factory battery trays. Delivering ultra-low internal resistance below 10mΩ, this 8.5kg ultra-lightweight power source minimizes cranking voltage dip, ensuring immediate engine ignition and protecting sensitive onboard ECUs and high-end automotive audio electronics.
Engine starting applications present intense current spikes and dynamic charging profiles from alternators. Our engineering team paired the LiFePO4 chemistry with a customized high-current BMS capable of supporting 100A continuous discharge and a 500A transient discharge cut-off. Operating reliably from -20°C to 60°C, the battery delivers a verified 450A Cold Cranking Amperage (CCA) at sub-zero temperatures through optimized electrolyte formulation and thick internal copper busbar connections. Built in accordance with ISO9001 manufacturing quality standards and tested against UN38.3 transport safety regulations, the battery features ultra-fast 200–600µS short-circuit response and a 75°C thermal cut-off, assuring industrial-grade reliability for fleet operators, marine captains, and performance automotive enthusiasts.
Specifications
12.8V 50Ah LiFePO4 Automotive Starter Battery
Brand Name
HiMAXBATT
Nominal Voltage
12.8 V
Nominal Capacity
50 Ah
Total Stored Energy
640 Wh
Internal Resistance
≤ 10 mΩ @ 50% SOC
Cold Cranking Amperage
450 A (at -20°C / -4°F)
Peak Discharge Curren
450 A to 500 A (3 to 5 Seconds)
BMS Discharge Cut-Off Current
500 A (3 to 5 Seconds)
Maximum Continuous Discharge Current
100 A
Recommended Charge Current
10 A
Maximum Charge Current
100 A
Recommended Charge Voltage
14.6 V
BMS Charge Cut-Off Voltage
14.6 V (3.65 ± 0.025 V per cell)
BMS Discharge Cut-Off Voltage
10.0 V (2.50 ± 0.1 V per cell)
Cell Chemistry & Structure
LiFePO4 (Lithium Iron Phosphate, 4S Prismatic)
Dimensions L x W x H
278 x 176 x 189 mm (10.94 x 6.92 x 7.44 inches)
BCI / DIN Group Size
Group H6 / LN3 / DIN70 Standard Casing
Net Weight
8.5 kg (18.7 lbs)
Terminal Type
Standard SAE Taper Posts (POS Ø19mm / NEG Ø17mm)
Frequently Asked Questions
Navigating the transition from lead-acid to lithium starter batteries raises key technical questions regarding charging compatibility, cold-weather reliability, and system protection. Below are engineered answers to common queries faced by automotive engineers and purchasing managers selecting the HiMAXBATT 12.8V 50Ah LiFePO4 battery.
Can I directly replace my lead-acid battery with the HiMAXBATT 12.8V 50Ah battery without altering the vehicle alternator?
Yes. The HiMAXBATT 12.8V 50Ah battery is engineered as a direct drop-in replacement. Its BMS supports a maximum charge voltage of 14.6V and recommended charging profiles compatible with standard 12V automotive alternators and Smart Alternator systems.
How can a 50Ah lithium battery replace a higher capacity (e.g., 70Ah) lead-acid battery for engine starting?
Engine starting depends primarily on Cold Cranking Amperage (CCA) and internal resistance rather than overall Ah reserve. LiFePO4 chemistry maintains voltage above 11V during cranking due to its ultra-low ≤10mΩ internal resistance, whereas lead-acid batteries drop significantly. The 450A CCA rating delivers equivalent or superior ignition power at 60% less weight.
How does this battery handle engine starts in freezing winter ambient temperatures?
The battery is specified to deliver 450A CCA at -20°C (-4°F). Under cold conditions, initial current passage creates minor internal heat across the cells, rapidly reducing cell impedance and ramping up discharge capability for confident cold starts.
What protection mechanism does the internal BMS provide during electrical short circuits?
The customized BMS integrates a high-speed short-circuit protection circuit that disconnects output within 200 to 600 microseconds (µS) if current spikes dangerously, automatically resetting once the fault condition is cleared.
Does the battery come with shipping and safety compliance standards for international delivery?
Yes. The battery meets international hazardous goods transport classification under UN 3480 Class 9 (UN38.3 compliance) and is produced in accordance with ISO9001 certified quality control processes.
