BT-20 interchangeable power bank module for 21700 lithium batteries(Compatible with 18650 battery)

Description

Product Introduction

The BT – 20 Power Bank features a card – style design with detachable batteries, offering you convenient power access anytime. Ideal for both home use and outdoor activities such as hiking and camping, this power bank has a long – lasting battery compatibility. It’s important to note that this product is only the power bank device and does not include batteries for sale. You need to prepare compatible batteries on your own.

1.Product Features

(Note: The BT – 20 is not compatible with non – standard 21700 batteries with a diameter greater than 21.8mm, such as the Panasonic 21700A, which measures 21.88mm.) It is compatible with 99% of flat – top 21700 lithium – ion batteries. With an adapter, it can also work with 18650 lithium – ion batteries, achieving an efficiency of up to 80% (85% in ECO mode). Please ensure that the batteries you prepare support at least 5A discharge and 2A charging. Old, weak, or damaged batteries should not be used. The product allows for the recycling of disassembled batteries, saving costs while being environmentally friendly.

The total travel weight remains under 107g considering the light – weight design of the power bank. When traveling by air, you can carry a total battery capacity of up to 27000mAh (the batteries must be removed for security checks, and the capacity must be clearly labeled). The BT – 20 is compatible with multiple protocols: QC/PD/PPS/FCP/DCP/AFC/PE, providing 20W PD fast – charging for all iPhone models, and 15±W PD and QC fast – charging for OPPO, Huawei, Honor, and Xiaomi devices.

2.Design Structure

The BT – 20 is equipped with one Type – C input/output port. You need to manually place the self – prepared batteries into the battery compartment. Its mechanical structure has a smooth and symmetrical design, making it easy to operate with either one hand or two hands. It features reverse – connection and reverse – charge protection, as well as one – button quick battery replacement. The device automatically detects the battery power. After 5000 life – cycle tests, components like springs and clips show no significant wear (if used 2 times a day, it can last for 7 years; if used 5 times a day, it can last for 3 years).

The multi – hole vacuum silicone insulation layer comes with 3μ gold – plated phosphor bronze contacts and 2.5mΩ parallel MOSFETs, enhancing safety. It is made of V0 fire – resistant PC engineering plastic and comes with a waterproof and flame – retardant Oxford cloth battery bag (for 2 or 4 batteries). The back of the device has a Velcro hook for attaching to 21700/18650 batteries, supporting use in RC head – mounted fixed frames and camera mounts.

3.Basic Parameters

• Output (Battery): 4.2V – 3A Max
• Output (Type – C): 5V – 3A, 9V – 2.2A, 12V – 1.67A
• Input: 5V – 3A
• Battery Capacity: Batteries need to be self – prepared (for reference, a battery like the EVE INR21700 – 50E with 5000mAh/18.5Wh is compatible)
• Color：Polar white
• Shell Material: Plastic
• Weight: 37 + 2g
• Dimensions: 85×49×24.5mm
• Compatible Batteries: INR 21700, 20700, 18650 (adapter required)

4.Battery Level Indicator

• 40%: Blue light
• 20% – 40%: Orange light
• 5% – 20%: Red light
• <5%: Flashing red light

5.Mode Switching

• Standard Mode: 5V/9V/12V fast – charging output
• ECO Mode: The green light indicates that the output is limited to 5V to reduce boost loss, increase efficiency, and lower the temperature.
• Low Current Mode: The light cycles to prevent the device from going to sleep until the battery is depleted. Note: ECO and Low Current modes cannot be switched directly. You need to switch back to Standard mode first.

6.Packaging List

1 BT – 20 unit / 1 USB – C charging cable / Instruction manual / Masking tape

7.Warranty Information

This product comes with a three – part policy: 7 – day no – reason return and a one – year warranty (excluding human – caused damage). Batteries come with a 6 – month warranty from the manufacturer (excluding damage to the battery casing). Again, please note that this product does not include batteries for sale, and you need to prepare compatible batteries on your own.

8.Safety Warning

The battery casing has insulation and anti – counterfeiting features. Do not remove it. If the casing is severely damaged or missing, do not use the battery. You will be responsible for any safety issues that may occur. Avoid using or storing the product in extremely hot or humid environments. If you notice bulging, stop using it immediately.

9.Important Notes

When inserting the self – prepared battery into the device, allow 5 seconds for power detection. During this time, do not charge the BT – 20, including reverse – charging for some phones (such as the iPhone 15), as this may cause detection failure and prevent normal operation. If this happens, re – insert the battery to restart the BT – 20.