Trojan Battery provides answers to commonly asked questions. 

Please review this list to see if there is an answer to your question.  In addition, please consult Trojan’s User Guides, or take a moment to view one of our Trojan Tips videos for additional information on battery maintenance.


Support Charging Installation Usage

Looking for additional information, contact us.


1. How do I reach Trojan Technical Support for this battery?
Trojan Battery technical support can be reached at (562) 236-3045. Use option “4” for specific lithium-ion battery questions.

2. Where can I purchase Trojan® Lithium-Ion batteries?
Trojan® Authorized Dealers who have completed Trojan® Lithium-Ion Battery Certification training carry our batteries today. Find the nearest dealer to you by clicking Where to Buy.

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Battery Charging

1. Which battery chargers are compatible with Trojan® lithium-ion batteries?

All lithium-ion battery chargers are currently compatible with Trojan® lithium-ion batteries. The following chargers have also been optimized with our profile:

 – DeltaQ Technologies
 – Lester Electrical

2. Can I use my existing lead-acid battery charger (Wet, AGM or Gel) to charge Trojan® lithium-ion batteries?
Whether you can use your existing charger depends on the model and whether an algorithm for that model exists. If the charger can be programmed with an appropriate algorithm or profile, it can be used. If not, or an appropriate algorithm is not available, then the charger will need to be replaced. Please contact Trojan Technical Support for a specific list of chargers and algorithms/profiles that are approved for use with the Trojan® GC2 48V lithium-ion batteries.

3. How long does it typically take to charge the Trojan® lithium-ion batteries?
Charging time varies with the depth of the discharge and the available charge current. Most commercially available chargers range from 15 A to 20 A maximum output. Assuming the battery was fully discharge and there are 18 A available for charging, it will take a little more than 1.5 hours for each battery installed in the set. For instance, two batteries will take about 3 hours. Charge time decreases with more available current and lower depths of discharge and increases with lower charge current.

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Battery Installation

1. What is the difference between a series connection and a parallel connection? Why is it relevant for this battery?

Batteries can be connected in series or parallel. In series configurations, battery connections are made between terminals of opposite polarity. The system voltage is the sum of the individual battery voltages, and the system capacity equals the capacity of an individual battery.

In parallel configurations, battery connections are made between terminals of the same polarity. The system voltage equals the voltage of an individual battery, and the system capacity is the sum of the individual battery capacities.

Most lead-acid batteries are supplied as 8V or 12V batteries that must be connected in series to achieve the system voltage (connecting six 8V batteries for a 48V system). The Trojan® GC2 48V lithium-ion battery is supplied as a 48V system and cannot be connected in series. However, for increased runtime, additional batteries can be connected in parallel.

2. Why would my Trojan® lithium-ion battery not turn on when I press the ON button?

Your battery is currently in a standby mode. To wake the battery from standby / storage mode, you must press and hold the button until all LEDs have illuminated plus an additional 2 seconds after the green light turns on.

If no LEDs illuminate when pressing the button, the battery may have an internal fault and should be returned to an authorized Trojan Lithium-Ion Dealer.

3. What reasons would the Alarm RED LED turn on?
The red LED indicates that an active alarm is present in the battery. There are many alarms that may cause this light. The most common alarms include:

Low Battery Voltage / Low State of Charge

High Current (Charging or Discharging)

High Voltage (Charging)

Low Temperature

High Temperature

Most alarms will self-clear in 20 seconds unless the alarm condition still exists. If you are unable to identify the cause of the alarm based on the environment and use of the battery, the alarm type can be read via CAN bus by an Authorized Trojan Lithium Ion battery dealer or by using a Trojan CAN bus fuel gauge.

4. I currently have 12V accessories (such as lights or a radio) that run off one 12V battery.  Can I run these 12V accessories off the Trojan® GC2 48V Lithium-Ion Battery?

Since the Trojan® GC2 48V lithium-ion battery is 48V, you cannot connect 12V accessories directly to the battery. An additional piece of equipment, called a converter, is necessary. As its name suggests, it converts the 48V from the battery to 12V to run the accessories.

NOTE: While commonly done, it is never recommended to connect 12V accessories to one battery in the set, regardless of battery type. The proper method is to install a 48V to 12V converter to power the accessories from the entire system.


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Battery Use

1. How does temperature affect the performance of my batteries?
Published battery capacity and discharge characteristics are based on an operating temperature of 77°F (25°C). Operating below this temperature will reduce the available capacity of the battery by up to 20% at temperatures below 32°F (0°C).

Temperatures below 68°F (20°C) will also reduce the charging current that can be accepted by the battery. Refer to the Trojan Lithium-Ion User’s Guide for additional information on charging your battery at low temperatures.

Download Trojan Lithium-Ion User’s Guide

2. What is the life expectancy of the Trojan® GC2 48V Lithium-Ion Battery?
Battery life expectancy is largely dependent on the frequency of use (Duty Cycle) and operating environment. The TR GC2-48-G is designed to operate for 8 years with a daily use to 70% of the initial battery capacity at an average temperature of 77°F (25°C).

More frequent use, discharges beyond 70%, or elevated temperatures will reduce the life expectancy.


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