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Dear divers.

Our team has recently been informed of a safety incident involving a 22V Li-ion 6Ah battery. (This type of battery is used with the SDS rotary hammer and V2 Nemo Grinder, and is designed to be replaceable under water).

While no injuries or severe damage are reported, we take any such incident very seriously and investigate any potential problems in order to constantly improve and ensure the quality of our tools.
We would like to take this opportunity to refresh and reiterate our saftey instructions for handling Nemo Lithium batteries:

Battery Safety
Lithium batteries are known to have the potential to catch fire while charging. This is a well recognized risk across all industries in which lithium batteries are used, and is the reason for the strict rules regarding air shipping and storage of such batteries.while the the risk associated with Lithium batteries is not unique to our industry, several factors increase the importance of following the safe handling procedures.

  • Our tools use high capacity batteries and are designed to be used by professionals in extreme marine environments.
  • Our batteries are sealed and enclosed in a heat dissipating aluminum container.
  • Nemo tools are used in a wide variety of working temperature and work load.

While the rate of failure is low among many thousands of Nemo tools dispatched around the world. However, any failure still represents a higher than usual risk compared to other industries and use-cases, and this calls for extra care and professional adherence to saftey guidelines.

A. Charging saftey:

  • Charge the batteries in a safe area, away from people, any flammable materials or anything that could potentially catch on fire.
  • Never charge a battery which is suspected to be faulty or flooded.
  • Dispose of old or failed batteries safely.

B. Know your battery and handle with care:

  • Handle the battery with care while attaching and detaching from the tool. It’s preferable to turn the tool up side down and carefully press the battery to the tool as a pose to placing the battery on a surface and pressing the tool on to the battery.
    The rubber molded electrical dry mate on the battery are a sensitive component. Repeated stress on these connector due to rough or misaligned attachment may damage the pins and seal.
  • When replacing a battery, insert the battery carefully to prevent damage to the pins. Press the battery firmly into place while it is aligned true to the tool. Press the battery into the tool, not the tool on top of the battery.
  • Lock both clips at the same time.

C. Know the risks:

If water does enter the battery casing, the short circuit may destroy the battery and cause it to release gas or even burst into flames.
Our batteries aluminium casing is design to hold up to 7 bars of internal pressure before the bottom part of the case “pops” as a last result safety feature.
This feature limits the energy of a potential explosion in a worst case scenario and ensures that the battery case will not throw high velocity, fragments if the case does fail.
However, such a failure is still energetic enough to cause injuries and could potentially start a larger secondary fire if flammable objects are nearby.

Always store & charge batteries away from people and any potentially flammable materials.