[Phone/Pad] Tips for battery charging and storage

Different battery usages, working temperatures, screen brightness, and Apps in operation all affect the durability and lifespan of the battery. Here is the introduction of battery features and tips for maintaining the battery.

Battery lifecycle

  1. Due to the chemical properties of Lithium ions, battery capacity decreases gradually with use over time. This is a normal phenomenon.
  2. The life of a Li-ion battery is approximately between 300-500 cycles. Under normal usage conditions and in ambient temperatures (25℃), the Li-ion battery is expected to discharge and recharge normally for 300 cycles (or about one year). Afterwards the battery capacity will drop to 80% of its initial capacity.
  3. Battery life decline varies with the system design, model, system power consumption, program and operating software consumption, and power management settings. High/low operating temperatures and abnormal operations may result in 70% or more rapid decrease of the battery’s life cycle within a short time.


    4. The battery’s discharge rate depends on the cellular phone/tablet’s software operations and power management settings. For example, running computation-heavy programs, such as gaming software and video playing, consumes more power than running general software.


Battery protection mechanisms

  1. Batteries charged or stored under high ambient temperatures or frequently charging under high voltage may have permanently damaged the capacity and accelerated battery life decline. When the battery temperature is too high or becomes overheated, battery charging capacity will be limited or even stop. This is part of the system’s battery protection mechanisms.
  2. Even though the phone has been turned off and the AC adapter is removed, the system still needs slight power consumption, so it's a normal scenario when the battery level still goes down.


Battery aging

  1. Batteries are essentially consumables. Li-ion batteries, featuring continuous chemical reactions, will naturally decline over time and lose capacity.
  2. After using a battery for some time, under some conditions it will have a degree of swelling. This will not create safety issues.
  3. Swollen batteries should be replaced and discarded properly, though they do not create safety issues. When replacing swollen batteries, do not discard the old swollen battery into common domestic waste. Contact your local ASUS customer service to dispose of batteries (https://www.asus.com/support/CallUs).


Standard battery care

  1. If a cellular phone, or tablet will not be used for a long time, charge the battery to 50%, turn the device off, and remove the AC power supply (adapter). Recharge the battery every three months to 50% to prevent battery damage by over-discharge due to long-term storage without using.
  2. When AC power supply is used constantly for cell phones, or tablets, the user should discharge the battery to 50% at least once every two weeks to release the battery from persisting high voltage which may reduce battery life. 
  3. The best storage conditions for batteries are ambient temperatures between 10°C - 35°C (50°F - 95°F)
  4. Avoid storing batteries in damp environments which may give increased battery discharge rates. Over-low temperatures will impair the battery’s internal chemicals, while batteries with over-high temperatures are under risk of explosion.
  5. Do not place your cell phone, or battery pack near radiators, fireplaces, furnaces, electric heaters, or other heat-producing equipment close by heat sources over 60℃ (140°F). Overheating the battery may cause it to explode or leak, leading to risk of fire.


ASUS battery warranty regulations

  1. ASUS provides battery warranty covering the below:
    • During the battery warranty period (refer to the product warranty card for the battery warranty date), should battery failure cause the machine to become unbootable, reboot/turn off irregularly by itself, or power off irregularly, we will exchange your battery for you.
    • During the battery warranty period, should the battery fail to hold charge,or if the charging light blinks in error (i.e., battery cannot charge normally), we will exchange your battery for you.
  2. Damages caused by the following reasons are not covered by the warranty
    • Reduced capacity due to normal decline
    • Failures and damages due to self or non-original manufacturer repairs, taking apart and reassembly, or unauthorized specification changes, or non-original manufacturer parts.
    • Company product serial number label or warranty identification number damaged or illegible, or unable to provide receipt as proof of purchase. To protect your rights, do not remove the original manufacturer warranty serial sticker, and keep your purchase receipt in safe place!
    • Moisture damaged internal battery wiring/connectors, or severe oxidation and rusting of electronic parts due to liquid seepage.
    • Other irregular uses


ASUS battery introduction

Li-ion battery

Benefits of Li-ion batteries include high energy density, large power capacity, light weight, high cycle life, no memory effect, and fast charging. They have been widely used in consumer products such as mobile phones, laptops, and tablets.