Colossal 40,000mAh capacity in a heavy-duty 4x8 layout, with ultimate safety.
This 32700 LiFePO4 (Lithium Iron Phosphate) Battery Pack features thirty-two large-format cells arranged in a 4S8P configuration (4 in series, 8 in parallel) in a massive 4x8 rectangular layout. It delivers a stable 12.8V nominal voltage (14.6V full charge) and a colossal 40000mAh capacity.
Unlike standard 3.7V Li-ion cells, LiFePO4 chemistry offers superior thermal stability, an ultra-long cycle life, and a much lower risk of fire or explosion. The 32700 form factor (approx. 32mm diameter per cell) is ideal for replacing heavy-duty 12V lead-acid batteries, powering large-scale 12V solar storage systems, RVs, marine equipment, and custom industrial projects. The 4x8 layout creates a massive rectangular block (258x130mm), delivering unprecedented energy density for the most demanding applications. It comes fully assembled with a built-in protection board (BMS) and pre-wired with red (positive) and black (negative) leads. Note: The wire ends are bare (no connector attached).
CRITICAL WARNING: Voltage Compatibility
This is a 4S LiFePO4 battery (12.8V nominal). You MUST use a dedicated LiFePO4 charger with a 14.6V cutoff. Never use a standard 4S Li-ion charger (16.8V) or a single-cell charger, as it will overcharge the battery and cause permanent damage or fire.
Key Features
LiFePO4 Chemistry: High thermal stability, excellent safety, and an ultra-long cycle life.
4S8P Configuration (12.8V / 40000mAh): Offers both the 12V voltage you need and eight times the capacity for massive energy storage and extended runtime.
Heavy-Duty 4x8 Layout: Massive rectangular design (approx. 258mm x 130mm x 72mm) ideal for large enclosures and high-capacity builds.
Built-in Protection Board (BMS): Protects against overcharge, over-discharge, over-current, and short circuits.
Pre-wired Leads: Comes with red (+) and black (-) wires. No connector is attached (bare wire ends).
Parameters
*Dimensions are approximate and include the protection board and heat shrink wrap. Please allow ±1-2mm tolerance.
Applications
Recommended For:
12V Solar Storage Systems: Ideal for large outdoor solar lighting or off-grid storage systems requiring colossal capacity.
RV, Marine & Off-Grid Power: Perfect replacement for heavy 12V lead-acid batteries in RVs, boats, campers, and mobile power stations.
DIY 12.8V Projects: High-capacity custom electronics requiring a stable 12V-12.8V power source.
Emergency Backup Power: Reliable, safe power for 12V emergency lighting or communication equipment.
Not Recommended For:
Devices Requiring 14.8V/16.8V: This battery will not work properly in standard 4S Li-ion devices due to the lower voltage.
Small or Tight Battery Bays: Due to its massive 4x8 size (258x130mm) and heavy weight (~4.8kg), please measure your enclosure carefully to ensure it fits and supports the weight.
Standard Li-ion Chargers: Never charge this with a 16.8V or 4.2V charger.
FAQ
Q1: Can I use my standard 4S Li-ion charger (16.8V) for this battery?
A: NO. You must use a dedicated LiFePO4 charger with a 14.6V cutoff. Using a 16.8V charger will overcharge and damage the battery, potentially causing a fire.
Q2: Why is the voltage 12.8V? I thought 4S was 14.8V.
A: This is a LiFePO4 battery, not a standard Li-ion battery. LiFePO4 cells have a nominal voltage of 3.2V (3.2V x 4 = 12.8V), with a max charge of 14.6V. Standard Li-ion is 3.7V/4.2V.
Q3: What does "4S8P" mean?
A: It means 4 cells in series (to quadruple the voltage to 12.8V) and 8 cells in parallel (to octuple the capacity to 40000mAh).
Q4: Can I use this to replace a 12V lead-acid battery?
A: Yes, it is an excellent, lighter, and longer-lasting replacement for 12V lead-acid batteries, provided your device's charging system is compatible with LiFePO4 (14.6V cutoff) and the physical size fits.
Q5: How should I connect the wires?
A: The red wire is positive (+) and the black wire is negative (-). Ensure correct polarity when connecting to your device.
