Do you have to fill all eight slots with batteries? Or can you use 2 or 3?

You must use at least one battery, but each of them will add more capacity to your bank. If you use 2000 mAh capacity batteries, 8 batteries = 16000 mAh.

What does it mean when the "IN" light flashes on the display while charging? Showing 0% charged.

...yeah, i haven't bought these yet but i have one i bought already put together and that one flashs 'in' while it's charging and 'out' when it is discharging along with a number displaying the percentage of charge.

Bought this two days ago. Is it supposed to be slow to charge? 17 hrs to go from 48% to 86%... That's more than a 24 hr charge rate. Really?

It depends on the current your power source supplies. A typical USB power supply charges at 1 to 2 amps. So...Yes. It will charge at a rate of 1 to 2 hours for each battery in the pack. If you have 8, 2 amp hour capacity batteries in the pack, it will most likely take roughly 8 to 16 hours to charge a depleted pack.

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DIY Power Bank 8 x 18650 Flat Head Battery Charger,2 USB Output Ports Plastic Shell Box with LCD Display,Micro/Phone/Type-c Input Port Power Bank Box with Flashlight (Dark Black)

DIY Power Bank 8 x 18650 Flat Head Battery Charger,2 USB Output Ports Plastic Shell Box with LCD Display,Micro/Phone/Type-c Input Port Power Bank Box with Flashlight (Dark Black)

Product ID: 441265624

Details

Brand
LHIABNN
Colour
Black
Connector type
usb
Special feature
Lightweight
Voltage
5 Volts

📊LCD display for real-time power status

🔋8x 18650 battery capacity

🔌Dual USB output, 2 devices simultaneously

Description

⚡ Power your hustle with precision and style!

CRYSTAL CLEAR LCD DISPLAY - Stay in control with an accurate, real-time power level readout—no surprises, just pure power.
CHARGE TWO DEVICES AT ONCE - Dual USB ports let you power your phone and tablet simultaneously—never choose who charges first again.
MASSIVE 8 BATTERY POWERHOUSE - Harness the energy of 8 flat-head 18650 batteries for unstoppable charge on the go.
COMPACT LIGHTWEIGHT READY TO GO - Sleek plastic shell design fits your busy lifestyle—easy to carry, install, and use anywhere.
SMART INDIVIDUAL BATTERY MANAGEMENT - Each battery slot charges independently and auto-stops when full, maximizing battery lifespan and safety.

This DIY Power Bank box supports 8 flat-head 18650 lithium batteries (not included) and features dual 5V/2A USB output ports for simultaneous charging. It includes a smart charger with individual battery detection and auto-termination, plus a clear LCD display for real-time battery status. Compact and lightweight with multiple input options (Micro/Phone/Type-C), it’s compatible with a wide range of smartphones and devices, making it the ultimate customizable power solution for professionals on the move.

Specifications

ASIN	B087ZX3GJF
Amperage	2 Amps
Antenna Location	Battery Charger
Battery Cell Type	Lithium Ion
Brand Name	LHIABNN
Colour	Black
Compatible Devices	Smartphone
Connector Type	usb
Customer Reviews	4.0 4.0 out of 5 stars (349)
Item Dimensions	17 x 8 x 2.2 centimetres
Manufacturer Part Number	HHB0359BK
Model Number	HHB0359BK
Number of Ports	2
Other Special Features of the Product	Lightweight,Portable
Output Current	2 Amps
Power Source	Battery Powered,Corded Electric,Usb Cable
Reusability	Rechargeable
Voltage	5 Volts
Wireless Charging Standard	Qi

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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