The battery replacement of Panasonic RZ-S500W True Wireless Earphone may destruct earphone’s appearance. Anyway here is the guide on how to replace its internal battery.
The first step to replace the battery is to cut the earphone off.
Open the earphone back cover and reveal the battery
Pull the battery off from the housing
Desoldering the battery from earphone’s mainboard
Soldering the new battery
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