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GS Audio 12-cell LTO prismatic battery pack 40Ah Lithium - LTO
GS Audio

12-cell LTO prismatic battery pack 40Ah

Lithium - LTO

Technical Highlights

  • 3500-4000W RMS, 14.4-15V recommended, internal resistance <0.5 mΩ.
  • Max discharge current 400A, nominal/max charge current 40/100A, 40Ah.
  • Dimensions 120x270x110mm or 45x690x110mm, 12 cells.
  • More technical details
€799,00
€799,00 €799,00
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inkl. VAT , possibly plus shipping
Ausführung: 120x270x110mm
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Apr 24, - May 1,
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12-cell LTO prismatic battery pack 40Ah by GS Audio

The 12 cell LTO prismatic battery pack 40Ah from GS Audio is based on Lithium - LTO technology. It consists of 12 prismatic cells with a capacity of 40Ah. The recommended operating voltage is between 14.4 and 15 V. The system is designed for a power output of 3500 to 4000 Watts RMS. The dimensions are available in two options: 120x270x110 mm or 45x690x110 mm. The integrated individual cells of type GS-20 LTO have a nominal voltage of 2.4 V. The internal resistance is below 0.5 mOhm and the connection is made via M5 threaded connections. The charging method is done with constant current and constant voltage.

Features
  • Lithium - LTO
  • Battery pack made of 12 prismatic cells
  • 40Ah capacity
  • Option 1 dimensions: 120x270x110 mm
  • Option 2 dimensions: 45x690x110 mm
  • M5 threaded connection
  • Power: 3500-4000 Watts RMS
Technical Data
  • Recommended voltage: 14.4-15 V
  • Maximum voltage: 16.2 V
  • Minimum voltage: 10.2 V
  • Nominal voltage per cell: 2.4 V
  • Nominal charge current: 40 A
  • Nominal discharge current: 40 A
  • Maximum charge current: 100 A
  • Maximum discharge current: 400 A (20C)
  • Internal resistance: <0.5 mOhm
  • Dimensions per cell: 108 x 116 x 22 mm
  • Weight per cell: 0.520 kg
  • Volume per cell: 0.26 l
  • Optimal operating temperature: -25 to +55 °C
  • Maximum operating temperature: -30 to +70 °C

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Frequently Asked Questions about 12-cell LTO prismatic battery pack 40Ah

What voltage range does the 12-cell LTO prismatic battery pack 40Ah from GS Audio operate in?

The recommended system voltage is between 14.4–15 V, which is common in the car audio environment. Additionally, system limits are specified: minimum voltage 10.2 V and maximum voltage 16.2 V. This range covers typical charging and discharging states of an LTO assembly. The individual cell (model GS - 20 LTO) has a nominal voltage of 2.4 V, which facilitates the classification of system values. Charging is done using constant current-constant voltage (CC-CV). For charge termination or CV phase, the maximum voltage of 16.2 V serves as a hard upper limit, while the recommended operating voltage of 14.4–15 V ensures low power loss and stable performance in everyday use. Especially if you enjoy listening to music loudly, you benefit from stabilizing the onboard network at 14.4–15 V to cleanly cushion pulse currents without reaching the upper pack limit.

How much RMS power can I realistically support and what do 3500–4000W RMS mean in practice?

The 12-cell LTO prismatic battery pack 40Ah is rated as ideal for 3500–4000 W RMS. At 14.4 V system voltage, 3500 W corresponds to about 243 A and 4000 W to about 278 A continuous current demand on the DC bus (idealized, without converter losses). At 15 V, the currents are around 233–267 A. The LTO individual cell (GS - 20 LTO) allows a nominal discharge current of 40 A and briefly up to 20C = 400 A per cell; the very low internal resistance of <0.5 mΩ per cell reduces voltage drops under load. In practice, the actual continuous capability depends on the setup, conductor cross-sections, connectors (M5 connection thread per cell), and thermal embedding. For typical car audio impulses, the mentioned power window works as long as the system voltage is maintained in the recommended range of 14.4–15 V.

What charging parameters (CC/CV, current, cut-off) apply to the 12-cell LTO prismatic battery pack 40Ah?

The specified charging method is Constant Current and Voltage (CC-CV). For each cell GS - 20 LTO, a nominal charging current of 40 A and a maximum charging current of up to 100 A are specified. The system side specifies 16.2 V as the maximum voltage; in practice, it is advisable to align the CV point with the product specification of 14.4–15 V to technically balance the end of charging, loss heat, and lifespan influence. The minimum system voltage is 10.2 V, which serves as the lower discharge limit. The optimal operating temperature is -25/+55 °C, with a maximum of -30/+70 °C; within the optimal range, the CC phase runs thermally more relaxed. Practically ensure to keep the wiring paths and contact surfaces (M5 connection thread per cell) low-resistance to achieve the CV phase without noticeable voltage drops at the pack.

What are the dimensions, and which installation option fits better in the car?

The 12-cell LTO prismatic battery pack 40Ah is specified with two dimension options: Option 1 measures 120 x 270 x 110 mm, Option 2 measures 45 x 690 x 110 mm. Both have a height of 110 mm but differ significantly in length and width. In the vehicle, Option 1 is suitable for compact installation spaces (e.g., side niches), while Option 2, with its narrow width of 45 mm, is interesting for slim, elongated mounting locations (e.g., along the side wall in the trunk). Also, plan space for cable bending radii and pole covers; the individual cells have M5 connection threads, which facilitate flat, low-resistance connectors. The individual cell GS - 20 LTO itself measures 108 x 116 x 22 mm, which is helpful for custom holders and spacers for a precise, mechanically stress-free installation.

What currents per cell are specified and how does that scale in the pack?

For each individual cell (GS - 20 LTO), 40 A nominal charging current, 40 A nominal discharging current, up to 100 A maximum charging current, and up to 20C = 400 A maximum discharging current are specified. The 12-cell LTO prismatic battery pack 40Ah consists of 12 prismatic cells; the resulting system currents arise from the internal configuration. Series connection increases the system voltage, while parallel connections increase the current capacity. Since the system parameters are specified as 10.2–16.2 V and the recommended voltage is 14.4–15 V, the current sizing is practically oriented to the DC requirements of your amplifiers and the design of the connectors (M5), busbars, and wiring. For pulse loads, the very low internal resistance of <0.5 mΩ per cell is crucial, as it keeps the voltage level stable; continuous loads should align with the nominal specifications of the cells.

How does the internal resistance of <0.5 mΩ affect voltage drops under high loads?

For internal resistance, the simple relationship ΔV = I · R applies. With <0.5 mΩ per cell, this means: Even at 200 A pulse current, less than 0.1 V drops across a cell; at 400 A, it would be under 0.2 V. This supports voltage stability, especially for car audio impulses in the range of 3500–4000 W RMS. The 12-cell LTO prismatic battery pack 40Ah benefits from this, as the overall system voltage under load drops less, provided that connection points (M5 threads, busbars, cables) are also designed to be low-resistance. Practically, this means: wide, short copper connections, clean contact surfaces, and sufficient clamping pressure. In combination with the recommended operating voltage of 14.4–15 V, the DC bus remains high even during transients, which reduces clipping at the amplifier and makes performance reproducible.

How do the temperature ranges affect usage and charging?

An optimal operating temperature of -25/+55 °C is specified, as well as a maximum of -30/+70 °C. Within the optimal range, nominal charge and discharge currents of the individual cell (40 A/40 A) and the CC-CV charging method can be well realized. The 12-cell LTO prismatic battery pack 40Ah should be positioned in practice to avoid heat sources and not obstruct air circulation to prevent temperature spikes close to +55 °C. At very low temperatures near the minimum specification, cells generally respond with increased internal resistance; therefore, during the CV phase, attention should be paid to the pack voltage (recommended 14.4–15 V, maximum 16.2 V). Mechanically, a play-free, low-stress mounting helps ensure that the prismatic cells are not additionally stressed by clamping forces during temperature changes.

What connection threads does the 12-cell LTO prismatic battery pack 40Ah have, and how do I size the cables?

The individual cell is specified with M5 threaded connections. This facilitates the use of solid copper in the form of busbars or lugs with a large contact area. Arrange the contact so that transition resistances remain minimal: bare, flat surfaces, appropriate torque for M5, flat washers. The current paths should be short and wide to carry the currents resulting from 3500–4000 W RMS at 14.4–15 V. For the pack integration into the vehicle's electrical system, choose identically low-resistance cross-sections so that the voltage stable at the pack does not get lost over the length of the wiring. Also, consider sufficient bending radius and height clearance above the connections, especially with the flat, long geometry of the dimension option 45 x 690 x 110 mm, so that the conductors do not stand on edge.

How do I interpret 40Ah capacity in terms of runtime and discharge rate?

The specified capacity refers to the entire 12-cell LTO prismatic battery pack 40Ah. Calculation aids: runtime in hours ≈ capacity [Ah] divided by load current [A]. For example: at 100 A average current, this would theoretically result in about 0.4 h. In practice, discharge rate, temperature, and voltage window (10.2–16.2 V, recommended 14.4–15 V) affect the usable capacity. Relevant cell values: nominal discharge current 40 A and maximum 20C = 400 A per GS - 20 LTO cell. For car audio impulses, the ability to deliver high currents with minimal voltage drop in a short time is particularly important, which is contributed to by the internal resistance <0.5 mΩ per cell. Size your consumers so that continuous currents respect the nominal range and the system voltage remains stable within the recommended window.

Why is there a nominal voltage of 2.4 V per cell, but 10.2–16.2 V as system values?

The nominal voltage of the individual cell GS - 20 LTO is 2.4 V. The system specifications 10.2–16.2 V describe the voltage window of the entire assembly and result from the sum of the cell voltages. With a nominal voltage of 2.4 V per cell, a nominal system value is obtained that corresponds to the recommended operating voltage of 14.4–15 V. 16.2 V represents the upper charging limit (CV-Cut-off), while 10.2 V is the lower discharge limit. The 12-cell LTO prismatic battery pack 40Ah uses these limits for practical design in the car audio sector, where 14.4–15 V is a common onboard level. Therefore, for evaluating measurements at your installation, refer to the system values to technically classify end of charge, depth of discharge, and voltage stability correctly.

Manufacturer information / responsible person

GS Audio SRL
Ganzerli Steven
Via Matteotti 220/a
San Pesistenzanio MO
Italy

Contact: info@gsaudio.it

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