[Nut-upsuser] Battery test feature of APC Back-UPS RS series

[Arjen de Korte]

Citeren Jean Delvare <khali op linux-fr.org>:

>> PS  Also, be advised that running deep discharge tests wear out your
>> battery, so you should only run these once every three to six months
>> (at most).
> Thanks for the hint. I didn't intend to use it again any time soon
> anyway. I presume it is essentially useful when you suspect that the
> battery needs to be replaced. Which I hope I won't have to do before 4
> years or so.

Usually, deep discharge (also known as 'runtime calibration') tests  
are used to determine the health of the battery. Depending on battery  
replacement policy, one would consider the battery has reached  
end-of-life if the battery capacity has decreased to 50 to 80% of the  
initial capacity (so you'd have to run them periodically to keep track  
of the trend).

Best regards, Arjen
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