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  5. Request to Discharge the Third-Party Battery Packs for Cordless Vacuum Cleaners from Sumitomo Shoten and Rowa Japan by Running the Vacuum Cleaners (Call for Stopping Use was Announced on October 29, 2021)

Request to Discharge the Third-Party Battery Packs for Cordless Vacuum Cleaners from Sumitomo Shoten and Rowa Japan by Running the Vacuum Cleaners (Call for Stopping Use was Announced on October 29, 2021)

December 17, 2021

On October 29, 2021, we asked owners of the third-party battery packs imported by Sumitomo Shoten and Rowa Japan that can be attached to Dyson cordless vacuum cleaners to stop using them and store them in a safe manner without throwing them away because they may catch fire even while being stored and not charging/discharging.
Various inspections conducted until now by the National Institute of Technology and Evaluation (NITE) confirmed that the battery pack can be discharged by running the vacuum cleaner with the method shown in section 1 below, and it can go into a safe state and not ignite.
Please confirm the instructions shown in section 1 below and follow them to discharge the battery packs before disposal.

  1. If you have Sumitomo Shoten's battery packs, because the company has already gone bankrupt, please dispose of those which are used at home according to your local municipalities’ disposal methods. As for battery packs used in business activities, since they are classified as industrial waste, please dispose of them as such.

  2. If you have Rowa Japan's battery packs, the company will collect them, so please follow the instructions provided by the company.

1. Discharging by running the vacuum cleaner

Please follow the steps below specifically to discharge your battery pack.
(If your battery pack could possibly be wet [e.g., if it has been stored outdoors], do not discharge the battery pack by running the vacuum cleaner. In this case, or if you do not have the vacuum cleaner, follow the method described in Note 2.)

[Discharging by running the vacuum cleaner]

  1. First, please prepare a plastic bucket with water (room temperature) in a sink or somewhere outside without anything combustible. Fill the bucket with about four liters of water.

  2. Set the battery pack in the rechargeable vacuum cleaner. Do not screw in the fixing screws at this time (see Reference images below).

  3. Put your hand on the battery pack with your palm and fingers grasping the bottom and top of the battery, and run the vacuum cleaner above the bucket (on “Moderate”, if modes are available).

  4. Continue to run the vacuum cleaner (for around 10 to 20 minutes) until the battery runs out (when the battery light flashes).

→ Please read "2. Measures to be taken after discharging" and continue with disposal and other measures.

Please note that you should be careful enough that there are no small children nearby when discharging the vacuum cleaner.

Note 1:

If you notice any of the following abnormalities during the above procedure, turn off the vacuum cleaner immediately, take out the battery pack, and put it into the bucket of water. Examples of abnormal reactions include:

In these cases, the battery may not be fully discharged.
To continue discharging safely, take the following actions (Saltwater treatment):

  1. Without removing the battery pack from the water, add approximately 120 grams of salt* (about eight tablespoons) to the water and stir it lightly to dissolve.
    *Keep the saline concentration around 3%.
  2. Leave the battery pack in that state. It will be fully discharged after approximately four days.
    (Perform the operation above in a well-ventilated area, such as outdoors. Also, because the water will become sewage containing corroded metal, please wear rubber gloves when removing the battery pack from the water and disposing of the waste water and sediment. Do not touch any of it with your bare hands.)

Note 2:

If the battery pack is wet and cannot be discharged by running vacuum cleaner, or if you do not have the vacuum cleaner, please do the same as in Note 1: add four liters of water (room temperature) containing 120 grams of salt* to a plastic bucket and put the battery pack in, and keep it submerged for about four days to discharge it.

*Keep the saline concentration around 3%.

2. Measures to be taken after discharging

When discharging by the above methods is complete, please do the following:

Link to Rowa Japan

Email address: info@rowa.co.jp

*It has been confirmed that once discharging is complete, the products can be stored or disposed of (collected, transported, crushed, incinerated, disposed of in landfill, etc.) and will not lead to a fire.
*Do not recharge and continue using the battery packs.

→When the battery is fully discharged, please follow up by disposing of it, etc.

Please note that the bucket of water is prepared as a precaution and do not put the battery pack in the water if it is fully discharged.

Reference 2: Products in question

If your battery pack is the model found to have caused fires, the name of the importer (Orange Line DC60 or ROWA JAPAN DC62) should be written as shown below.

Photos of the products in question

<Sumitomo Shoten's battery packs>

<Rowa Japan's battery packs>

Related materials

Division in Charge

Product Accident Information and Analysis Office, Product Safety Division, Industrial and Product Safety Policy Group

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