Start Power Rb50A 12/24 Power Unit 4600 Amps - 12V / 3000 Amps - 24V

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Part# 11-15556
MFR Model# ARB50A1224


The RB50A 12/24 is a switchable unit that can be changed between 12V and 24V settings. This tough and compact unit has exceptional power to weight ratio.

The Red Box hand portable packs are some of the most powerful Hand Portable Packs available worldwide. Red Box uses the latest in military aerospace technology to achieve a very high power to weight ratio. These power packs are designed for starting of piston, turboprop or turbine aircraft and helicopters in the field or in remote locations and Red Box units may be carried safely on board all aircraft. The power packs are “all weather” units and being modular, can be used in single or dual format. They can be used or stored in any orientation, even inverted. Cells used are cleared as non-hazardous cargo for carriage in the aircraft. They are able to operate in extremes of temperature and have excellent standby characteristics. They are maintenance free and do not require cycling. They can be re-celled “on condition” at any Red Box service center in the world and are designed to give years of repeated service. In addition to aviation, these highly portable units can be used with Armored Fighting vehicles and Military equipment. They can be recharged from the automatic charging system, which is supplied in the package, or from any vehicle using a suitable interface.

Volts DC: 12 / 24
Peak Amps: 2300 (12v) / 1500 (24v)
Maximum S/C Amps: 4600 (12v) / 3000 (24v)
Battery Typ: Lead Acid
Weight: 32 kg


  • 12V/24V switchable
  • Totally weather protected.
  • Air transportable, ‘Non Hazardous‘
  • Maintenance free.
  • Tough and compact.
  • No memory effect.
  • Works in any orientation.
  • High charge retention.
  • Long shelf life.
  • Fast recharge.
  • No cycling.
  • Leak proof.
  • Cells replaceable on condition.
  • Lightweight portable start power at remote locations.
  • External charger for prolonged unit life.


  • Max amps 24V: 1500 (Nom. short circuit current)
  • 2300 (Max. short circuit current)
  • Max amps 12V: 3000 (Nom. short circuit current)
  • 4600 (Max. short circuit current)
  • Capacity 24V: 27 Amp Hrs @ 10hr rate
  • Capacity 12V: 54 Amp Hrs @ 10hr rate
  • Max voltage: 26v DC
  • Size: L400 W230 H210 mm
  • Weight: 32 kg
  • Operating Temp: -40°C – + 60°C
  • Case: Stainless Steel
  • Voltage Indication: Digital to IP65
  • Auxiliary Protection: Circuit breaker 40A
  • Auxiliary Input: 29V DC
  • Aircraft Cable: 2 m heavy duty
  • Charger: 8 Amp universal AC input. Charging time less than two hours from 50%
  • Protection: Reverse polarity warning

In The Box

  • Charger
  • Output Cable
  • Carry Bag
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Just purchased and used it almost immediately as plane was cold and would not start plug the center back wires into either the 24v or 12v input, then the Cessna / aircraft connector to plane, then the aircraft connector to the output of the RB50. Finally, pull the large, red, round “on” switch up. I tried starting plane again, with the RB50 connected and the plane fired right up. I work in a very very rural area and really like that the battery can be used to start the plane and a car. So far so good.

November 3, 2022


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Hi, We are in Colombia and We need to know what kind of input plug has the START POWER RB50A 12/24 POWER UNIT to charge it. I mean, Here in Colombia We use 110 and/or 220 VAC. Regards

This product is a 110 vac input.

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