> On September 9, 2015 at 12:18 PM G Mann via Mercedes <mercedes@okiebenz.com>
> wrote:
> 
> 
> Cycle life of battery has likely been exceeded along with age.

My TomTom XXL cooks its battery. I suspect it just has overvoltage protection
instead of a real smart charge circuit. 
One time last winter I left it plugged in for a couple of days and now the
3 year old battery is totally useless instead of mostly useless (life had
dwindled to about 30 minutes before the last overcharging, now it's less than
ten minutes, was 2-3 hours when new). 

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