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CMOS battery

CAPSLOCKSTUCK

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#1
Is there any need to routinely replace a cmos battery ?
Can you tell ( via software) if it needs replacement ? or are there any symptoms ?
Does a mobo "recharge" a cmos battery ?
 
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#2

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#3
Turn your system off by the PSU and if the bios forgets the settings chances are it's the cmos battery, battery normally last years a long time as the psu is typically left on and no they are not normally rechargeable.
 

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#4
A defective motherboard can cause a battery to last as little as 14 days. A good motherboard and a good battery can go unrelated for a decade or more.

They are not rechargeable. They can last so long because the rate the motherboard draws from it is supposed to be extremely low.