Product Overview: 51.2V 100Ah Battery
Operating Voltage: 51.2V
Charging Voltage: 57.6V ± 0.8V
Recommended Charge Current: 20A (0.2C)
Max. Continuous Discharge Current: 100A
Max. Continuous Output Power: For Electric Cart: 5000W; For Energy Storage: 5120W
The product is suitable for electric carts that speed lower than 25 MPH (40 KM/hour), such as golf carts, low-speed vehicles (LSV), and neighborhood electric vehicles (NEV).
Additional Components
- M8- 5/8" (16MM) Terminal Bolts: Recommended terminal torque: 106.2 to 123.9 inch-lbs / 12 to 14 N·m. These bolts secure multiple cable lugs to a single battery terminal. They can be replaced with M8 5/16" (8mm) bolts of other lengths if needed.
- Battery Parallel Communication Cable: Used for connecting batteries.
- External Communication Cable (with RJ45 Coupler): For connecting batteries to Victron GX series devices.
- RS485 Communication Extension Cable (Used with External Communication Cable): For connecting batteries to LiTime 48V solar inverter chargers.
- Insulating Caps for Bolts: Cover the battery terminals with these caps after tightening the bolts. If a cap melts, discontinue use and contact service@litime.com.
Battery Parameters
| Cell Type | LiFePO4 |
| Nominal Voltage | 51.2V |
| Rated Capacity | 100Ah |
| Energy | 5120Wh |
| Internal Resistance | ≤40mΩ |
| Cycle Life | ≥4000 times |
| Charge Method | CC/CV |
| Charge Voltage | 57.6V ± 0.8V |
| Recommended Charge Current | 20A (0.2C) |
| Max. Continuous Charge Current | 100A |
| Max. Continuous Discharge Current | 100A |
| Surge Discharge Current | 600A@1 second |
| Max. Continuous Output Power | For Electric Cart: 5000W For Energy Storage: 5120W |
Technical Specifications
| Dimension | L19.88*W12.32*H9.25 inch L505*W313*H235 mm |
| Housing Material | SPCC |
| Recommended Terminal Torque | 106.2 to 123.9 inch-lbs / 12 to 14 N·m |
| Protection Class | IP65 |
| Temperature Range |
Charge: 0°C to 50°C / 32°F to 122°F Discharge: -20°C to 60°C / -4°F to 140°F Storage: -10°C to 50°C / 14°F to 122°F |
| Low Temperature Charging Protection (LTCP) Function | Yes |
| Resume Charging Temperature Under LTCP | 5°C/41°F (Battery Temperature) |
① This battery is suitable for electric carts that speed lower than 25 MPH (40 KM/hour), such as golf carts, low-speed vehicles (LSV), neighborhood electric vehicles (NEV), and so on.
② This battery supports Low Temperature Charging Protection (LTCP), where the BMS stops battery charging when the battery temperature falls below 0°C/32°F and resumes charging when the temperature rises above 5°C/41°F.
How to Estimate the Battery Capacity: State of Charge (SOC)
The battery capacity can be roughly estimated by its resting voltage (not charging/discharging voltage). Since the voltage of each battery is slightly different, and the voltage measurement is affected by the measuring instrument, ambient temperature, etc., the following parameters are for reference only. The actual SOC of the battery is based on the discharge capacity under load.
Resting Voltage: The voltage is measured after the battery has been disconnected from the charger and loads with zero current, and left alone for 3 hours.
| SOC (%) | VOLTAGE (V) |
|---|---|
| 0 | 40 to 48 |
| 25 | 52 to 52.6 |
| 50 | 52.6 to 52.8 |
| 75 | 53.2 to 53.32 |
| 100 | ≥53.322 |
① Based on the characteristics of LiFePO4 batteries, the voltage measured by all LiFePO4 batteries during charging/discharging is not the real voltage of the battery. Therefore, after charging/discharging and disconnecting the battery from the power source, the voltage of the battery will gradually drop/increase to its real voltage.
② After this battery is protected from overcharge, the tested battery voltage (not the real voltage) will be lower than the real voltage. To calculate the SOC (%), add 0.5V to 0.7V to the tested battery voltage.
Parallel Connection
The Premise of Connection
To connect in parallel, batteries should meet the below conditions:
- Identical batteries with the same battery capacity (Ah) and BMS (A);
- From the same brand (as lithium batteries from different brands have their special BMS);
- Purchased in near time (within one month).
Limitation for Series/Parallel Connection
Situation 1: When the battery is in communication.
Support connecting up to 16 identical batteries in parallel for up to: 48V(51.2V) 1600Ah battery system.
Situation 2: When the battery is NOT in communication.
Support connecting up to 4 identical batteries in parallel for up to: 48V(51.2V) 400Ah battery system.
What to Do When the Battery Stops Working?
When the battery:
- ❌ Can't work
- ⚡ Can't be charged
- ⬇ Voltage < 36V
It has 85% chances that the BMS has shut it off for protection. You can try one of the below ways to activate the battery.
General Steps
If the BMS has cut off the battery for protection, follow the below steps to activate it:
- Step 1: Cut off all the connections from the battery.
- Step 2: Leave the battery aside for 30 minutes. Then the battery will automatically recover itself to normal voltage (>40V) and can be used after fully charged.
If the battery is unable to recover itself after the above steps, please try activating by one of the below two methods.
After activated (voltage > 40V) and fully charged by the normal charging method, it can be used normally.
Method 1
Use a charger with lithium battery activation function to fully charge the battery.
Method 2
Connect a controller that supports 48V LiFePO4 battery charging to charge the battery for 3~10s in sunny daytime.
