Author Topic: Lithium Ion Batteries  (Read 838 times)

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Offline Thistleman

  • Posts: 84
Lithium Ion Batteries
« on: January 02, 2017, 10:17 AM »
I was one of the lucky individuals to receive a 90th anniversary CXS in October 2015

However as I prefer the TXS form  factor it has remained unused in its systainer since arrival

Yesterday I opened it up and was surprised to find that the battery was still almost fully charged even though I have never charged it myself and it is as it arrived from Festool

My question is how long does a lithium ion battery hold its charge as 15 months to my mind is exceptional
Festool, Mafell and Felder

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Offline kevinculle

  • Posts: 20
Re: Lithium Ion Batteries
« Reply #1 on: January 02, 2017, 11:36 AM »
Lithium ion batteries are generally spec'd at about a 10% self discharge rate per month.  This would lead to a fully charged battery reaching a bit above 20% state of charge after 15 months (0.9^15).