Safety & Handling Guidelines for ACC Batteries

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ActSafe has produced a battery information folder that focuses on safe battery use and handling. This information folder will be sent out with all new ascenders and batteries as well as all ascenders and batteries that undergo annual inspection.

The intention of these Safety and Handling Guidelines is to make all users aware of:

  • The risks associated with Lithium-ion batteries
  • The increased risks with aged/used Lithium-ion batteries
  • How to minimize the risks
  • How to handle the battery for maximal performance during its service life

Part of the information in the folder concerns older batteries and batteries showing poor performance. Below is some additional information around the service life.

Older batteries and batteries showing poor performance means an increased risk level, that is the main reason why we have introduced a maximum service lifetime for power ascender batteries. The remaining capacity and time are the two factors that govern the service life. Batteries should be taken out of service either:

  • When less than 80% of the initial capacity remains.

    In reality this means that if the ascending distance at normal temperature (around 20 C) with a load of 120 kg (excl. the ACC) is less than 150 meter, than the battery should be replaced. The value 80 % of the initial capacity is stated in the design specification for the particular battery cell type we are using. This is nothing ActSafe can influence.

  • In accordance with the expiry date label.

    The service life is 2,5 years from manufacturing. That ensures the user gets > 2 year service life. The reason for introducing an expiry date is due to fact that all lithium-ion batteries degenerate over time, they age. They may only last two to three years, even if they are properly stored on a shelf and unused. In addition a power ascender is an extremely demanding battery application and this contributes to a relatively short service life for the batteries.

  • Hence, batteries produced before June 2011, not marked with an expiry date label nor individual serial number, should be taken out of service not later than 2 years after the date of purchase.

    We realize the service life statement might raise questions, especially those involved in rescue or similar where the ascender/battery not is used that frequently. A user with a battery not frequently used that are older than 2 years and still with a capacity > 80% of the initial capacity may at his own risk continue to use the batteries for an extended period of another 6-12 months. One should however be aware of the increased risks and the battery must not be charged unattended.

    Lindome 2013-07-15

    /Magnus Glans

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