Hi @inkwolf ,
Given the cost of a replacement why risk it?
You are reading the open circuit voltage value. When the battery is connected to a load its voltage may drop dramatically as it may not be able to handle the load anymore i.e. supply the amount of current needed to correctly operate the device.
Usually these type of batteries have a shelf life of 10 years but this doesn’t mean that they will last 10 years once they are connected to a device. It simply means that they won’t self discharge i.e. discharge internally, as quickly as some other types of batteries can when in storage and not in use.
If you decide to replace it, remember to dispose of the old battery properly as they can be dangerous especially for small children who think that they’re sweets. Don’t leave it lying around etc.