All batteries have useful life and health percentage, in the best health conditions, the internal battery can work for up to 8 hours without recharging.
The battery needs to be charged, or if it has just been charged, you need a new battery.
Yes, all Dynapro active and portable bands have Bluetooth.
No. More than 90% of commercial speakers have a paper screen that cannot be waterproof, but all passive Dynapro bands are resistant to water and moisture, but not waterproof.
The answer is definitely no.
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