Renogy Pro Series 12.8V 135Ah Underseat Lithium Iron Phosphate Battery

High-Capacity LiFePO4 Power in a Compact Underseat Design

The Renogy Pro Series 12.8V 135Ah Underseat Lithium Iron Phosphate Battery is designed to provide dependable energy storage while making efficient use of limited installation space. Developed specifically with RVs and mobile applications in mind, its compact housing is designed to fit beneath RV seating, helping maximise the available interior space without compromising battery capacity.

With a 12.8V nominal voltage and 135Ah rated capacity, the battery provides approximately 1,728Wh of nominal energy storage. It uses Lithium Iron Phosphate (LiFePO4) battery technology and automotive-grade battery cells, offering a combination of high energy density, deep discharge capability, efficient operation and long service life.

The battery weighs just 14.5kg, which Renogy states is around half the weight of comparable lead-acid counterparts. It can also be safely discharged to 100% depth of discharge, allowing a greater proportion of the stored energy to be utilised.

Long Service Life and High-Power Performance

The Renogy Pro battery is built for applications requiring reliable, repeated charging and discharging. It is rated for more than 4,000 cycles at 80% depth of discharge, providing a long-lasting energy-storage solution for regular-use applications.

The battery supports a maximum continuous charge current of 135A and a maximum continuous discharge current of 135A, making it suitable for systems with significant electrical demands when correctly installed and paired with compatible equipment.

A peak discharge capability of 350A for 3 seconds provides additional short-duration power for suitable loads. The battery has a specified voltage range of 10V to 14.8V, with a recommended charge voltage of 14.4V.

Renogy recommends charging a single 12.8V 135Ah battery at 67.5A, with a standard charging process taking approximately 2.5 hours under the conditions specified in the manual. The battery is compatible with suitable MPPT solar charge controllers, AC battery chargers and DC-DC chargers, provided they are correctly configured for LiFePO4 batteries.

Intelligent Battery Management System

At the heart of the battery is a smart Battery Management System (BMS) designed to monitor and protect the battery during charging and discharging. Renogy specifies more than 60 fault alarms and protection functions, helping protect the battery against a wide range of abnormal operating conditions.

Protection includes monitoring for battery cell overvoltage and undervoltage, high and low temperature conditions, charging and discharging overcurrent, and short circuits.

The BMS also incorporates battery cell balancing to help maintain an appropriate balance between the individual cell groups. During charging, the system can divert current around higher-voltage cell groups when the specified voltage difference is reached, helping reduce differences between cell groups and support consistent battery performance.

Intelligent Self-Heating for Cold-Weather Charging

The battery features an integrated self-heating function designed to help maintain charging performance when temperatures are low.

When the battery temperature falls below 0°C, the built-in heater can automatically activate when the appropriate charging conditions are met. The heater operates to raise the battery temperature and stops automatically once the battery temperature rises above 10°C.

At full 100W heating power, Renogy specifies an approximate temperature rise rate of 20°C per 70 minutes. For the self-heating function to operate normally, the manual specifies a stable charging current greater than 10A per battery in a parallel battery bank.

This feature is particularly useful for leisure and off-grid systems that may be exposed to cold environmental conditions, helping provide more consistent charging performance without requiring the battery to be manually heated.

Smart Monitoring and Flexible System Expansion

The Renogy Pro 135Ah battery supports real-time monitoring through the Renogy App, which is available free of charge. When connected through Bluetooth, users can monitor battery parameters directly from a compatible phone or tablet. For short-range monitoring, Renogy recommends keeping the phone within approximately 3 metres of the battery.

For longer-range communication and system management, the battery can be connected to a Renogy ONE Core, which is sold separately. Renogy ONE Core can provide longer-range communication and can be paired with the Renogy App for remote monitoring and system management.

The battery can also be expanded into larger battery banks. Up to 8 batteries can be connected in parallel or up to 4 batteries in series, allowing 12V, 24V and 48V-class systems to be created. Combined series-and-parallel configurations are also possible, subject to Renogy's connection requirements.

A maximum 4P4S configuration can provide a nominal 48V (51.2V), 540Ah system with 27,648Wh of energy when using sixteen compatible batteries.

When connecting multiple batteries, Renogy specifies that batteries should be properly balanced before connection and that batteries of different chemistries, capacities, nominal voltages, brands or models should not be mixed.

Specifications, Applications & Installation

The Renogy Pro Series 12.8V 135Ah Underseat Lithium Battery is suited to a wide range of applications, including RVs, motorhomes, solar power systems, trolling motors, marine applications, camping and off-grid systems. Its under-seat format makes it particularly useful where available installation space is limited.