that is, the positive pole faces inward and the negative pole faces outward;
Close the battery holder cover (11) and turn clockwise to tighten it.
Safety Measures
When charging, please use the 5V2A power adapter compatible with the device. Using
any other type of adapter may cause irreversible damage to the battery or the adapter
itself;
If the device is not in use for a long time, the battery should be partially charged, not fully
charged or discharged.
Do not charge the device immediately after it is moved to a warm environment from a
cold environment. Wait for 30 to 40 minutes for preheating.
If the charger is modified or damaged, do not use it;
The device should be charged at a temperature of 0°C to +40°C. Otherwise, the battery
life will be significantly reduced.
When charging, please do not leave the battery unattended;
Do not connect the battery to the power supply for more than 24 hours after it is already
fully charged;
It is not recommended to connect third-party devices that consume more energy than the
allowed value.
The device is equipped with a short circuit protection system, but conditions that may
lead to a short circuit should be avoided.
The recommended operating temperature for the device is -20°C to +50°C. Do not use the
device beyond this temperature range, or else, it may shorten the battery life.
When the device is used under sub-zero temperature, the battery capacity drops. This is
normal and does not indicate a defect.
Switching between two types of batteries
The Tube series supports the dual power supply system: built-in Lithium-ion battery pack and
replaceable 18500 battery, while supporting a USB power supply.
If both batteries are installed in the Tube device, two battery icons are displayed on the
