RPS II Battery Coupler Kit (for joining 2 batteries together)

£40.00 Plus VAT at applicable rate. Excluding delivery.
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Join two ResMed Power Station II (RPS II) batteries together with the RPS II Battery Coupler Kit. The RPS II external battery allows you to power your AirSense 10 or S9 CPAP device when you don’t have access to the mains power supply. With this kit, you can pair two batteries together to double the operating time of your device.

Products available on this Store are intended for sale in the United Kingdom only. 


The RPS II Battery Coupler Kit can be used to connect two RPS II external batteries. This enables you to power your AirSense 10 or S9 CPAP device for twice as long when you’re away from the mains power supply. The RPS II Battery Coupler Kit can also be used to charge two RPS II battery packs at the same time. 

Depending on the CPAP device you are using (AirSense 10 or S9), you’ll need a compatible Power Supply Unit adapter: 

  • PSU adapter for AirSense 10 CPAP device

  • PSU adapter for S9 CPAP device 

Please refer to the user guides for relevant information related to any warnings and precautions to be considered before and during use of the product.

Ask your doctor about using this medical device to treat your obstructive sleep apnoea.  

Technical details

Manufacturer Resmed
Included in Package RPS II Battery Coupler, Velcro strap, labelling

Instructions for using two RPS II batteries  

  1. Place one battery on top of the other. If required, use the Velcro strap to hold the batteries together securely.  
  1. Plug the battery coupler cables into each of the battery DC input/output ports.  
  1. When charging two batteries, attach the power supply unit adapter to the DC plug and connect the adapter to the battery coupler.  
    When powering a device, connect the DC output cable of the device to the end of the battery coupler. The primary battery supplies power to the device and the reserve battery takes over when the primary battery is disconnected or discharged. 

Please note that the battery coupler cables are marked with ‘1’ (primary) and ‘2’ (reserve) labels. The battery that is connected with the primary cable supplies power to the device until it is disconnected or discharged, at which point the reserve battery will take over. 

Download the RPS II user guide  for information about how to use your RPS II Battery Coupler Kit.  


Most orders are delivered within 3-5 working days, however please allow up to 10 working days.

  • Delivery is usually within 5 working days, via Royal Mail*
  • Online orders cannot be expedited once placed. If you require an order URGENTLY, instead of ordering online please order by phone on 0800 917 7071 (available Monday to Friday 09:00-17:00)
  • Online orders cannot be amended or cancelled once placed, however you can return products within 14 days for a full refund, please refer to Section 5 within our Terms & Conditions for full information
  • Orders are sent via Royal Mail. If your package is too large to fit through a letterbox or a signature is required, it will be taken to a local Royal Mail sorting office for you to collect at your convenience
  • For full information on Returns, please click here

* Under normal conditions. Orders cannot be expedited after they are placed online.


VAT relief is available on certain products in the ResMed online shop.

In the UK, customers are entitled to buy these products VAT free if they are disabled and/or have a chronic sickness, provided the product relates to their disability or sickness and is for personal use.

Moderate to severe obstructive sleep apnoea is considered a chronic sickness, along with other diseases or conditions. This means that, if you have moderate to severe OSA or another chronic sickness, you may be able to buy some products from our online shop VAT free. 

Eligible customers should check the box marked, I am entitled to VAT relief for disabled people, before adding any item(s) to their basket.  

For further information, please click here to read more, or check the HMRC Vat Notice 701/7 web page. 


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