1. Product Overview
The Timeusb 12V 100Ah LiFePO4 Battery is an advanced deep-cycle lithium battery designed for various applications including RVs, marine, solar systems, and off-grid power. It features automotive-grade battery cells, a robust 100A Battery Management System (BMS), and a lightweight, compact Group 31 design.
- Automotive Grade Battery Cells: Ensures 4000-15000 deep cycles for extended lifespan.
- Lightweight & Compact: Weighs only 23 lbs (2.6X lighter than lead-acid) with a Group 31 BCI size for easy handling and installation.
- 1280Wh Usable Energy Output: Provides 100% usable capacity, double that of lead-acid batteries.
- Built-in 100A BMS: Offers 5 intelligent protections against overcharge, over-discharge, over-current, short circuit, and high temperature.
- Fast Charging: Achieves full charge in approximately 5 hours with a 14.6V 20A LiFePO4 charger.
- Expandable Capacity: Supports up to 4S4P connections for a maximum of 400Ah capacity or 48V (51.2V) voltage.
2. Safety Instructions
Please read and understand all safety instructions before installation and use of the battery. Failure to follow these instructions may result in electric shock, fire, or other serious injury.
- Always wear insulating gloves and eye protection during installation and wiring.
- Do not disassemble, modify, or attempt to repair the battery.
- Avoid short-circuiting the battery terminals.
- Do not expose the battery to fire, extreme heat, or direct sunlight for prolonged periods.
- Ensure proper ventilation when charging or discharging in enclosed spaces.
- Use only LiFePO4 compatible chargers with appropriate voltage and current settings.
- This battery is not suitable for starter batteries or golf cart applications.
- Keep terminals covered when not in use to prevent accidental short circuits.

Image: Timeusb 12V 100Ah LiFePO4 Battery highlighting safety, durability, portability, IP65 waterproof rating, and eco-friendliness.
3. What's in the Box
- Timeusb 12V 100Ah Pro LiFePO4 Battery
- 2 x M8 (16MM) Terminal Bolts
- 2 x Insulating Caps for Bolts
- User manual
4. Setup and Installation
4.1 Initial Battery Preparation
- Upon receiving the battery, inspect it for any visible damage.
- Ensure the battery is charged to at least 50% capacity before initial use. A full charge is recommended for optimal performance.
- Install the provided M8 terminal bolts and insulating caps.
4.2 Connecting the Battery
When connecting the battery to your system (e.g., inverter, trolling motor, solar charge controller), ensure correct polarity (positive to positive, negative to negative) to avoid damage.
- Connect the positive (+) terminal of the battery to the positive terminal of your device/system using appropriate gauge cables.
- Connect the negative (-) terminal of the battery to the negative terminal of your device/system.
- Secure all connections tightly to prevent loose contacts and arcing.
Video: Demonstrates the discharge operation of the Timeusb 12V 100Ah LiFePO4 battery, connecting it to an inverter and powering electronic devices.

Image: Diagram showing multiple Timeusb 12V 100Ah LiFePO4 batteries connected in a 4P4S configuration for power expansion, supporting up to 16 batteries for a maximum load of 20.48kW and 51.2V.
5. Operating Instructions
5.1 Charging the Battery
The Timeusb 12V 100Ah LiFePO4 battery can be charged using a compatible LiFePO4 battery charger, solar panels with a charge controller, or a generator with a DC-DC charger.
- Recommended Charge Current: 20A
- Maximum Charge Current: 100A
- Recommended Charge Voltage: 14.6V
- A 14.6V 20A LiFePO4 battery charger can fully charge the battery in approximately 5 hours.
Video: Demonstrates the charging operation of the Timeusb 12V 100Ah LiFePO4 battery, connecting it to a compatible charger.

Image: Illustrates various charging methods for the Timeusb 12V 100Ah LiFePO4 battery, including a dedicated charger, solar panel, generator, and alternator.
5.2 Discharging the Battery
The battery can be discharged to power various 12V compatible devices. The built-in BMS protects against over-discharge.
- Maximum Continuous Discharge Current: 100A
- Peak Discharge Current: 200A (3s)
- BMS Discharge Cut-Off Voltage: 10.0V (2.5V/Cell)

Image: Various usage scenarios for the Timeusb 12V 100Ah LiFePO4 battery, including RV power, trolling motors, camper power, home backup power, off-grid systems, and solar panel systems.
5.3 Parallel and Series Connection
The Timeusb 12V 100Ah LiFePO4 battery supports both parallel and series connections to increase capacity or voltage.
- Up to 4 batteries can be connected in series (4S) for a maximum voltage of 51.2V.
- Up to 4 batteries can be connected in parallel (4P) for a maximum capacity of 400Ah.
- A maximum of 16 batteries can be connected in a 4S4P configuration.

Image: Diagram showing two Timeusb 12V 100Ah LiFePO4 batteries connected in parallel, indicating proper connection for increased capacity.
6. Maintenance
- Regularly inspect battery terminals for corrosion or loose connections. Clean as needed.
- Store the battery in a cool, dry place away from direct sunlight and extreme temperatures.
- For long-term storage, charge the battery to 50% capacity and disconnect it from any loads. Recharge every 3-6 months to maintain battery health.
- Avoid fully discharging the battery below the BMS cut-off voltage to prolong its lifespan.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Battery not charging | Charger not connected, faulty charger, or BMS protection activated. | Check charger connection and functionality. Ensure charger is LiFePO4 compatible. If BMS is in protection mode, disconnect load and allow battery to rest. |
| Battery not discharging | Loose connections, BMS protection activated (over-discharge, over-current, short circuit). | Check all cable connections. Disconnect load, allow battery to rest, then reconnect. Reduce load if over-current protection is triggered. |
| Reduced capacity/runtime | Aging battery, improper charging/discharging habits, extreme temperatures. | Ensure proper charging voltage and current. Avoid deep discharges. Operate within recommended temperature range. |
8. Specifications
| Feature | Specification |
|---|---|
| Brand | Timeusb |
| Model | 12V 100Pro NEW |
| Voltage | 12 Volts (12.8V Nominal) |
| Battery Capacity | 100 Amp Hours |
| Energy Output | 1280Wh |
| Battery Cell Composition | Lithium Iron Phosphate (LiFePO4) |
| Cycle Life | 4000-15000 cycles |
| Maximum Continuous Discharge Current | 100A |
| Peak Discharge Current | 200A (3s) |
| Recommended Charge Current | 20A |
| Recommended Charge Voltage | 14.6V |
| Terminal Type | M8 |
| Product Dimensions (L x W x H) | 13"D x 6.77"W x 8.5"H |
| Item Weight | 22.1 pounds |
| BCI Battery Size | Group 31 |
9. Warranty & Support
Timeusb provides a 5-year warranty for this 12V 100Ah LiFePO4 battery, covering defects in materials and workmanship under normal use. Additionally, lifetime technical support is offered through their responsive customer service team.
For any questions, technical assistance, or warranty claims, please contact Timeusb customer service.
- Warranty Period: 5 Years
- Support: Lifetime customer service and technical support.