TopBand Litium

TopBand 12V Lithium - battery is designed to replace an AGM battery of the same size while providing up to twice the runtime.

For example, the TopBand 50Ah weighs only 6.8kg and corresponds in power class to an approx. 75-80Ah AGM battery. In addition to the power class, it is worth remembering the light weight, as the TopBand 50Ah battery weighs only approx. 25% of AGM batteries of the corresponding power class.

Thanks to LiFePO4 technology, the TopBand battery is very safe and long-lasting. The battery withstands at least two thousand full charges from empty to full, with 100% deep discharges, under normal conditions. The TopBand lithium battery can also be installed on its side, making it easier to find a place for the battery. The battery's BMS manages the operation of the battery and prevents it from being completely discharged or overcharged, which is why lithium batteries are significantly longer-lasting and therefore a more economical solution than AGM batteries.

Winter storage and other important information:
Lithium batteries are not stored fully charged; a charge of approx. 60-80% is a suitable level. Charge the battery full and leave the battery without connecting it to a maintenance charger. Under normal conditions and at room temperature during the winter, the battery will not discharge completely, as the monthly self-discharge is small. The storage temperature should not go below -15 °C, so the battery should not be stored in a cold garage or boat.

Charging the battery:
Please note that lithium batteries should always be charged with a sufficiently powerful charger. We recommend the Victron 17A or 15A charger, which is an excellent charger for charging and maintenance. Even if the AGM battery "crashes", a sufficiently powerful charger will bring the battery back up. A low-power maintenance charger will damage the battery if it does not have enough power to bring the battery back up. Always use chargers of at least 10A. If the charger is permanently installed in the boat, remember to make sure that there is no flammable material in the immediate vicinity of the charger and that air can circulate around the charger. The charger heats up when it uses its full capacity.

The batteries are supplied with a LiFePO4 Battery Management System (BMS) that can monitor and optimize each single prismatic cell during charge and discharge, to protect the battery pack against overcharge, over-discharge and short circuit. Overall, the BMS helps to ensure safe and accurate running.

Country of manufacture: China

MotorGuide Xi3 55lb 54" FW, accessory package and TopBand battery available as a limited special batch

TopBand 12.8V 12Ah

• Weight: 1kg

TopBand 12V 50Ah

• Dimensions: 196x165x174mm
• Weight: 6.8kg
• Voltage: 12.8V
• Capacity: 50Ah
• Maximum charging current: 50A
• Recommended charging current: < 25A
• Recommended charging voltage: 14.6 V +/- 0.1 V
• Maximum continuous discharge current: 50A
• Cycles at 100% discharge: approx. 2000
• Cycles at 80% discharge: approx. 5000
• Charging temperature range: 0 - 45 °C
• Operating temperature: -20 - 60 °C

TopBand 12.8V 75Ah

• Dimensions: 260x168x213mm
• Weight: 9.8kg

TopBand 12.8V 100Ah

• Dimensions: 318x165x215mm
• Weight: 12.3kg
• Voltage: 12.8V
• Capacity: 100Ah
• Maximum charging current: 80A
• Recommended charging current: < 60A
• Recommended charging voltage: 14.6 V +/- 0.2 V
• Maximum continuous discharge current: 100A
• Cycles at 100% discharge: approx. 2000
• Cycles at 80% discharge: approx. 5000
• Charging temperature range: 0 - 45 °C
• Operating temperature: -20 - 60 °C
• Available with and without Bluetooth

TopBand 12.8V 125Ah

• Dimensions: 318x165x215
• Weight: 12.3kg
• Voltage: 12.8V
• Capacity: 125Ah
• Maximum charging current: 80A
• Recommended charging current: < 50A
• Recommended charging voltage: 14.6 V +/- 0.5 V
• Maximum continuous discharge current: 80A
• Cycles at 100% discharge: approx. 2000
• Cycles at 80% discharge: approx. 5000
• Charging temperature range: 0 - 45 °C
• Operating temperature: -20 - 60 °C
• Available with and without Bluetooth

Example: TopBand 12V 50Ah Lithium detailed specifications:

• Normal Voltage: 12.8V
• Normal Capacity: 50Ah
• Internal Resistance: ≤20mΩ
• Battery Operation Temperature Range: 0~45°C
• Normal Charge Voltage 14.6V
• Recommended Float Charge Voltage 12.8V
• Max Charge Current: 50A - Battery initial Temp 25°C
• Recommended Charge Current: ≤25A
• Battery Operation Temperature Range: -20~60°C
• Output Voltage Range: 10.0~14.6V
• Allowed Discharge Current: 50A withstand 30min @Battery initial Temp 25+/-5°C
• Pulse Discharge Current: 150A withstand 3s
• Discharge Cut-Off Voltage: 10.0V

• Dimension: Length 196mm, Width 165mm, Height 174mm
• Weight: 6.8kg
•  Storage Temperature & Humidity Range: Short: within one month -20~35°C, 45~75%RH, Long term: above one month: -10~30°C, 45~75%RH
  
• Self-discharge rate: Residual capacity ≤3% per month; ≤15% per year, Reversible capacity: ≤1.5% per month; ≤8% per year

Electrical Characteristics & Test Condition
Testing Conditions: Ambient Temperature: 25+/-5°C; Humidity:45%~75%.

• Internal Impedance: ≤20mΩ
  Test the internal resistance of 50% SOC battery pack with 1 kHz AC internal resistance test instrument. 
• Capacity: ≥49Ah
  Rest for 1 hour after fully charged, then discharge with 0.33C current until the battery reaches the discharge cutoff voltage. Repeat above process for three times, if the discharge time is not less than 180 minutes, you can stop and define the Discharging current*time value (Ah) as battery capacity.
• MAX charge Current: 50A
  Charging with this current for more than 0.5h and the added temperature of battery pack less than 20°C. 
• MAX discharge Current: 50A
  Discharging with this current for more than 0.5h and the added temperature of battery pack less than 35°C. 
• Cycle life (DOD%100):  ≥2000 cycles
  Discharge with the current of 0.5C until it can't discharge, and then rest it for 1h. Charge the battery following CC(0.33C)/CV(14.6V) mode to full capacity, and then rest it for 1h. Repeat above process until full charged capacity is no more than 80% of normal value. Accumulated times is defined as cycle life. 
• Discharge Temperature Characteristics:  -20°C ≥70%, 0°C ≥80%, 25°C 100%, 55°C ≥95%
  At 25+/-5°C discharge the battery with the current of 0.33C to the cut-off voltage. Store the battery at various temperatures for 2h and discharge the battery with 0.33C to the cut-off voltage. Record the ratio between discharging & charging capacity. 
• Charge Retention ability: Remain capacity ≥90%
  Charge the battery to full capacity and store it for 28 days, and then discharge it with 0.33C to the cut-off voltage. 

Product text updated 26.9.2026.