This post is an update of a post I published on my previous blog. I summarize some tips to prolong the life of your gadget’s batteries based on various articles.

The baseline is that the speed by which lithium-ion ages is governed by temperature and state-of-charge. Based on this observation, there are following Do’s and Don’ts:

  • Don’t discharge the battery every time to (nearly) 0%: The discharge should go ideally to around 50%. This gives you the longest total battery life. Following table of Battery University illustrates this:
Depth of discharge Discharge cycles Total battery life (1 full cycle = 2,5h)
100% 300 – 500 750h – 1250h
50% 1200 – 1500 1500h – 1875h
25% 2000 – 2500 1250h – 1562,5h
10% 3750 – 4700 937,5h – 1175h
  • Don’t leave it fully charged and plugged in: Every battery constantly leaks some of its power. When you leave your battery plugged in, it will recharge a little amount of leaked power over and over again, each time triggering a new cycle. These consecutive very short cycles are very bad for your battery’s health.
  • Most gadget batteries should be calibrated by applying a deliberate full discharge once every 30 charges (every month): You can do this by running the battery down in the equipment. If you neglect to do this, the battery metering will become increasingly less accurate and in some cases cut off the device prematurely.
  • Keep the lithium-ion battery cool: Avoid a hot car or leaving your gadget in the sun. For prolonged storage, keep the battery at a 40% charge level in a cool place.
  • Consider removing the battery from a laptop when running on fixed power: The worst condition is keeping a fully charged battery at higher temperatures, which is the case with running laptop batteries.
  • Avoid purchasing spare lithium-ion batteries for later use: But if you buy one, pay attention to the manufacturing date. Do not buy old stock, even if sold at clearance prices.
  • If you have a spare lithium-ion battery: Use one to the fullest and keep the other cool by placing it in the refrigerator. But do not freeze the battery! For best results, store the battery at 40% state-of-charge.

This post is based on: