Secondary Batteries

A secondary battery is a battery that can be recharged to its original status by passing a current through the cells in the direction that is opposite from the direction of discharge. Secondary batteries can be utilized in two ways: (1) connected to and charged by the main energy source that supplies energy when needed, or (2) used and discharged before being recharged with the appropriate charging mechanism. An example of the first use would be batteries that are utilized in vehicles and an example of the second use would be batteries that are used in laptops and phones.

Absorbent Glass Mat (AGM)

An absorbent glass mat (AGM) battery is one of the many different types of secondary batteries. Typically, AGM batteries are configured for 12 volts. This means the battery is composed of 6 cells in series, with each cell providing 2 volts. There are many layers to an AGM battery: a positive grid, a positive plate, a positive plate with micro glass fleece that is responsible for absorbing the electrolytes, a negative grid, and a negative plate. Several of these layers put together make up a single cell.


Pros to AGM Batteries

There are six main pros to utilizing AGM batteries (especially over a lead-acid battery).

  1. Spill-Proof – Glass mat within AGM batteries prevents the spilling of electrolytes.
  2. High Power Output – AGM batteries are designed to offer low internal resistance, allowing for higher power output in short bursts.
  3. Short Charge Time – AGM batteries can charge up to five times faster than a lead-acid battery.
  4. Longer Lifespan – AGM batteries feature limited self-discharging.
  5. Durability – AGM batteries are designed to withstand vibrations.
  6. Less Sulfation Build Up – AGM batteries do not have the accumulation of lead sulfate crystals, lessening the chance of failure.

XS Power AGM Batteries

Two of the most popular XS Power AGM choices are the XP series and D series.

XP Series

Battery Secondary Wattage Max Amp RC AH

Up to 750w 750 28 22

Up to 950w 950 50 35

Up to 2,000w 2,000 150 80

Up to 2,500w 2,500 185 100

Up to 3,000w 3,000 240 120


D Series

Battery Primary Wattage Secondary Wattage Max Amp CA RC AH

Up to 600w 800 190A 15min 14


Up to 600w 800 240A 15min 14

Up to 1,000w 1,000 320A 28min 20

Up to 1,000w Up to 2,000w 2,000 550A 55min 28

Up to 1,000w Up to 2,000w 2,100 525A 50min 35

Up to 1,500w Up to 3,000w 2,600 725A 80min 44

BCI Group 47


Up to 2,000w Up to 3,000w 2,900 745A 105min 50

BCI Group 48

Up to 2,000w Up to 3,000w 3,000 815A 120min 60

BCI Group 51

Up to 2,000w Up to 3,000w 3,100 745A 100min 60

BCI Group 51R

Up to 2,000w Up to 3,000w 3,100 745A 100min 60

BCI Group 34

Up to 2,500w Up to 4,000w 3,300 1,000A 135min 65

BCI Group 24


Up to 2,500w Up to 4,000w 3,500 670A 150min 70

BCI Group 65


Up to 3,000w Up to 4,000w 3,900 1,070A 150min 75

BCI Group 49

Up to 3,000w Up to 4,000w 4,000 1,075A 120min 80

BCI Group 27

Up to 3,500w Up to 4,500w 4,300 1,170A 185min 100

BCI Group 31

Up to 4,000w Up to 5,000w 5,000 1,360A 237min 110

Up to 5,000w Up to 7,500w 6,000 1,700A 280min 140


Link to XS Power Car Audio AGM Batteries

Link to XS Power AGM Batteries (D Series)

Link to XS Power AGM Batteries (XP Series)

Lithium Batteries

A lithium battery is one of the many different types of secondary batteries. There are four main components to lithium batteries: anode, cathode, electrolyte, and a separator. When chemical reactions occur within the anode, lithium releases electrons and creates lithium ions. This event is known as discharging and is what allows the current (the electrons) to flow through the external circuit and to the cathode. As the current travels from the anode to the cathode, it generates energy that can be used to power devices. The anode is what stores lithium ions when the battery is charged. During charging the current (the electrons) are replaced and returned to the anode. The electrolyte acts as a channel, allowing the lithium ions to move between the anode and cathode. The separator is constantly at play, keeping the anode and cathode separated and allowing the lithium ions to move from the anode to the cathode during discharging and from the cathode to the anode during charging with help from the electrolyte.

Pros to Lithium Batteries

There are five main pros to utilizing lithium batteries.

  1. Energy Density – Lithium batteries have a higher energy density than other rechargeable batteries.
  2. Weight – Lithium batteries weigh considerably less than other rechargeable batteries.
  3. Voltage Out – Lithium batteries can produce a higher voltage output than other rechargeable batteries.
  4. Safety – Lithium batteries are more resistant to overcharging.
  5. Fast Rates – Lithium batteries feature faster charge and discharge rates than other rechargeable batteries.

XS Power Lithium Batteries

One of the most popular XS Power lithium choices is LTO (Yinlong) cells.

Nominal Voltage (V) 2.3
Rated Capacity (Ah) 40
Volume-energy density (Wh/L) 128
Weight-energy density (Wh/kg) 76
Internal resistance (mΩ) ≤0.5
Maximum continuous charge current (A) 240
Maximum continuous discharge current (A) 240
10s Maximum pulse charge/discharge current (A) 400
Operating and storage temperature range (°C) -50-65
Storage temperature (°C) -5-35


Wattage Rating
100A Alternator 4,000w
200A Alternator 5,000w
300A Alternator 6,000w

Link to All Batteries @ Down4SoundShop

Don’t forget to use code Euro_Bass when making purchases at Down4SoundShop!

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