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Today’s battery research is heavily focused on lithium chemistries, so much so that one could assume that all future batteries will be lithium systems. Lithium-based batteries offer many advantages over nickel and lead-based systems. Although maintenance free, no external service is known that can restore the battery’s performance once degraded….

Simple Guidelines

• Charge the Li-ion often, except before a long storage.
  
  Avoid repeated deep discharges.
• Keep the Li-ion battery cool. Prevent storage in
  
  a hot car. Never freeze a battery.
• If your laptop is capable of running without a battery
  
  and fixed power is used most of the time, remove the battery
  
  and store it in a cool place.
• Avoid purchasing spare Li-ion batteries for later
  
  use. Observe manufacturing date when purchasing. Do not
  
  buy old stock, even if sold at clearance prices.

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Source:Ppcsg.org