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Battery tank FX1204

Article number 12041
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Product Information

View product information of Battery tank FX1204


FX12041: A compact battery tank with 4 Ah power and fixed mounting plate

The FX1204 is the smallest copy of the Metalsub battery tank series. With 12 Volt and 4 Ah power it delivers a long burning time of 120 minutes when using a 24 Watt lamp head (at full power) up to 40 minutes when using the most powerful 60 Watt Metalsub cable light.

This small but powerful battery tank would be an ideal travel companion, since it won’t take up too much luggage space. Though it provides more than enough power for your dive light while diving.


Despite the compact dimensions of this battery tank, it’s a full member of the Metalsub family:

  • Manufactured from a very high quality aluminum.
  • Equipped with Metalsub's unique anodising layer, according to US Military Standards (MIL-A-8625-E type3 class2). This protective layer is also impregnated with Teflon, which guarantees a high degree of corrosion resistance.
  • Equipped with an overpressure valve, so that any gases which arise during charging can safely leave the battery.
  • Designed according to the "less is more" principle: no unnecessary buttons, lids or openings.
  • The battery tank has only one connection that is used both to connect the (exchangeable) lamp head and to charge the lamp.
  • The streamlined, rounded, minimalist design without sharp edges also ensures that underwater lines and nets do not easily catch on this tank.
  • Equipped with Metalsub's very robust cable light coupling: connect or remove in seconds with just a quarter turn.

Technical specifications

Aluminium, hard-anodized and impregnated with Teflon*
Weight above water
1.6 kg
Weight under water
1 kg
Maximum dive depth
250 meters
Maximum pressure test
25 bar
Overpressure valve for any battery gas leakage
Battery type
Battery power
12V - 4Ah
Charging time battery cells
2 hours
Capacity with 2400 Lumen LED head
ca. 110 min**
Capacity with 5100 Lumen LED head
ca. 45 min**
Capacity with 6350 Lumen LED head
ca. 40 min**
Mounting options
Anodised in accordance with American Military Standard MIL-A-8625-E type 3 class 2 and impregnated with Teflon, which guarantees a high degree of corrosion resistance.
Measured at a full power dimming position and at a water temperature of 20ÂșC.


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