How often should you replace batteries?

[jchadbourne]

Sorry not sure where to post this.

I have 5 or 6 sony vtc4's that have been in rotation for the last 8 months, how often should they be discarded? or how will I know when to discard? They still hold charge at 4.2 v.

 

[rondasherrill]

Usually they have around a year lifespan, but as long as they are still dependably holding a charge, they are probably okay.