Battery Maintenance

Battery Maintenance Facility

Eylex has been maintaining a number of Lithium-Ion batteries for the Defence Material Organisation since 2005.

As the cost of Lithium-Ion batteries is still relatively high it becomes cost effective to maintain the batteries correctly.  Lithium-Ion batteries will eventually become unusable over time but with proper management this time can be extended providing an immediate cost benefit to the user.

Eylex also provides additional Battery Management services to the Defence Material Organisation including individual battery tracking for analysis and performance.  This includes:

  • Failed battery fault analysis
  • Total average battery fleet capacity and state of health data
  • Battery internal resistance reports
  • Classification of batteries into unserviceable and serviceable groups
  • Pre delivery warranty testing on new batteries
  • Battery fleet ageing information to assist in purchasing decisions therefore only buying batteries when required and not running the risk of buying batteries that remain in stock slowly ageing



  • For best results, keep Lithium-Ion batteries cool.  In addition, store the battery at a 40% charge level.
  • Never fully charge or discharge the battery before storage.
  • The 40% charge assures a stable condition even if self-discharge robs some of the battery’s energy.
  • If Lithium-Ion batteries must be stored for a prolonged period the state of charge should be checked regularly and provision should be made for recharging the cells before the cell voltage drops below the recommended minimum after which the cells suffer irreparable deterioration.
  • Batteries are a perishable product and start deteriorating right from the time they leave the manufacturing plant.  For this reason, it is not advisable to stock up on batteries for future use.  This is especially true with Lithium-based rechargeable batteries.  The buyer should also be aware of the manufacturing date.  Avoid acquiring old stock.
  • Advise the users of these recommendations.  Research has shown that batteries that are individually issued to users have a reduced failure rate.
  • Many battery users are unaware that weak batteries charge faster than good ones.  Low performers gravitate to the top and become available by going to “ready” first.  With age, the available space gradually decreases and the charge time becomes shorter.  The charger simply fills the available space to store energy, and “ready” indicates that the battery is full.


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