Acceptable, why turn an entire device into ewaste for a single component dying, especially one with a known limited service life, like a battery.
10 year warranties minimum on all electronics. Regardless of size and fragility. Any electronic device that can't last 10 years in service is unnecessarily contributing to ewaste and should not be allowed.
User replaceable batteries to avoid using battery life decay as a means to drive sells of "new" versions, something that causes e-waste.
To be honest, don't stop at batteries. Any component in a device that can not last 10 years while retaining atleast 75% of its "ability" must be user serviceable, no exceptions.
User serviceable is defined as any service a user can perform where the OEM will replace the device at no charge (not even shipping) if the device breaks during or because of the user servicing it during normal warranty.
Replacing a device under warranty resets the 10 year timer. To discourage OEMs halfassing it for 5 years and hoping for low warranty claims.
We can not allow companies to treat the earth like a garbage can.