Build your own high-capacity power bank with this solderless 18650 battery storage case, holding up to 21 flat-head 18650 cells (batteries not included). Simply drop in your batteries and go — no welding required, and cells are removable and swappable anytime. A built-in dual-LED flashlight with 3 modes adds everyday utility for camping, emergencies, and outdoor use.

Key Features:

• Holds 21 x 18650 flat-head batteries — solderless, no welding needed
• Removable, swappable battery design for easy maintenance
• Dual USB output for charging two devices at once
• Built-in flashlight with 3 modes: steady beam, slow flash, high-blink (SOS)
• Anti-reverse polarity protection for safe charging
• Multiple input options: DC input, Micro-USB, USB-C
• Available in 4 configurations to match your charging needs (see below)
• Compact DIY shell — perfect for camping, emergency kits & backup power projects

Available Variants:

• T21 — Standard: 5V/2.1A input & output
• T21 QI — Adds 5W wireless charging output
• T21 PD — PD3.0 fast charge: 5V-3A / 9V-2A / 12V-1.5A
• T21 PD QI — Full-featured: PD3.0 + QC4.0 fast charge, up to 15W wireless charging, max output 5V-4.5A

Specifications:

• Capacity: Holds 21 x 18650 batteries (not included; use new cells rated above 3.2V)
• Output: Dual USB + wireless (QI models), up to 15W wireless / 22.5W wired (PD QI)
• Input: DC / Micro-USB / USB-C
• Protection: Anti-reverse protection
• Shell Type: Detachable, solderless DIY case

Package Contents:

• 1 x 21x18650 Battery Power Bank Case (batteries not included)

Ships to US, Canada & Europe. Free shipping available. 30-day easy returns.