The product operating life is 2-3 years (*based on average user charging 3 times per week)

The capacity of any type of battery will diminish after a certain amount of recharging. With lithium-ion batteries, the capacity diminishes slightly with each complete charge cycle. 

Lithium-ion batteries may be charged at any time and there is no requirement to fully discharge the battery before recharging it again. A single charge cycle is achieved each time you fully discharge 100% of the battery capacity and recharge the battery again.

A discharge of 50% of the battery and recharge the battery represents one half charge cycle. The batteries in IQbuds2 MAX are designed to retain 80% of their capacity after 400 full charge cycles giving the product a long usage lifespan.

Lithium-ion batteries are affected by temperature.
To preserve rechargeable batteries, use the following guidelines:

• Recommended storage conditions: Temperature 20 to 30C humidity not greater than 93%. Avoid placing in direct sunlight or extreme cold.
  
  
• Operating temperature range: 0 to 45C when charging and 0 to 60C while in use.
  
  
• Do not store IQbuds2 MAX for extended periods without recharging them.  If not regularly used charge around every 4 months.
  
  
• If you handle or store rechargeable batteries incorrectly, their lifetime may be reduced.
  
  ##As per the product and safety guide: Do not attempt to replace the bud batteries or the charger accompanying battery yourself. You could damage the battery which could cause overheating, fire or injury.  Batteries in this product are only serviceable by Nuheara or an authorised service agent and should be returned to Nuheara for service or replacement (a cost will apply if outside the warranty period).