AliExpress alternative to the Power Bank Shell with 18650 Lithium Cell Slots

The match is category-level, not model-confirmed. GreatScott!'s video did not name a brand or model number, so the AliExpress listing was matched on the 18650 cell format and DIY shell function. The AliExpress candidate offers 2-slot and 4-slot variants with explicit "batteries not included" language, which aligns with the reviewed product type. Treat it as a functionally equivalent shell, not a guaranteed identical unit.

This answer covers the Dual-Slot 18650 Battery Charger Power Bank Kit option on this page. The AliExpress listing specifies standard USB-A output only; there is no USB-C PD in the listed configuration. Charging speed depends on the output regulation circuit inside the shell and the capacity of the 18650 cells installed. Most commodity shells like this deliver 5V at 1A or 2A, which is adequate for overnight charging but slow compared to a 20W PD charger. Verify the output spec on the specific variant before buying if fast charging is a requirement.

The 2-slot shell reaches approximately 5,600 mAh and the 4-slot shell approximately 10,000 mAh when loaded with genuine 2,600 mAh to 3,500 mAh cells from brands such as Samsung 25R, Panasonic NCR18650B, or Molicel P26A. Actual delivered capacity depends on the protection circuit efficiency, which is typically 85 to 90 percent for budget shells. Avoid no-name cells claiming 9,000 mAh per cell; those figures are fabricated and the cells can be a fire risk.

The listing states the 4-slot version includes an LCD charge indicator. On comparable commodity shells, the display shows a segmented battery-level estimate rather than a precise voltage or percentage readout. Reliability varies; some users report the display fading after several charge cycles. If an accurate state-of-charge reading is important for your project, a shell with a dedicated battery management chip and calibrated display is a better fit.

This answer covers the Dual-Slot 18650 Battery Charger Power Bank Kit option on this page. Most shells in this category include a basic PCB with over-charge, over-discharge, and short-circuit protection, and the AliExpress listing implies a built-in protection circuit. However, the quality and trip thresholds of budget protection circuits vary widely, which is part of what GreatScott!'s review highlighted. If you are building a pack that will be carried in a bag or used in a critical application, verify the protection chip model on the PCB after the shell arrives and test it before regular use.

Most 2-slot and 4-slot shells in this format accept both flat-top and button-top 18650 cells because the spring contacts have enough travel to accommodate the height difference (typically 1 to 2 mm). If the listing does not specify, assume both are compatible, but check the contact depth once the shell arrives. Protected 18650 cells (which add a small PCB cap and run about 69 to 70 mm) may be too long for some shells designed for unprotected cells at 65 mm.