W500 9cells battery suddenly dead. No previous warning.

I know batteries gets wear over time, and that once should be exchange, but I believe that a suddenly dead is not normal
Up to yesterday, batterie has been working good, and after aprox 400 charging cycles baterie was performing quite good (more than 1 hour of batterie). Mostly with charging cicles from 55% to 75%.
Today, suddenly, running on batterie on about 40% to 45% the computer got turnned off, plugen in, turning again, message was clear: your battery condition is poor and WILL NOT CHARGE AT ALL (not exact those words)
is that way definitelly a dead batery?
nothing to be done? even as a "SAI" batterie ?
best regards!!
and happy holidays 

Sure it is the battery, a second battery works without issues in the same computer
About SAI, sorry, SAI is spanish, I meant UPS. And as a  most of the time, I have the laptop pluged in. So, a battery that would lask matter of minutes would be enough to avoid unexpected loss of power (and to avoid daily wear of the second battery)
I presume that if the cotrol circuit fail, there is nothing to do with that battery, even the cells have half life trough ...

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