Assuming that you use the sterilizer light once per day, its battery endurance can still vary according to your use case, as follows:
Manual mode, using UV-C & Ozone, 10 mins per session: Up to 10 days
Auto mode, using only UV-C, 5 mins per session: Up to 25 days
Auto mode, using UV-C & Ozone, 5 mins per session: Up to 20 days
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