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Four-bay USB battery charger with red-green LED display and adjustable sliding contacts

GRACETOP

GRACETOP GT-04U 4-Bay USB Smart Battery Charger

SKU CH-RJ3T-PBPF1

Four independent bays charge 3.7 V lithium-ion cells from a 5 V USB source with per-slot current up to 1.5 A

  • Product typeChargers
  • Safe 5 V USB power avoids high-voltage risks
  • Four independent bays charge simultaneously at up to 1.5 A per slot
  • Adjustable sliders fit 10440 to 26650 Li-ion sizes
  • Red/green LEDs show charging and full status clearly
  • Over-charge, over-heat, over-voltage and short-circuit protection built in

Four-bay USB charger for Li-ion cells

The GRACETOP GT-04U charges up to four 3.7 V lithium-ion batteries at once. Each bay works independently so mixed sizes and charge states do not interfere with each other. It draws power from any 5 V USB source such as a power bank, laptop or wall adapter. The unit is built from fire-retardant PC+ABS plastic for safe operation.

Limited to 5 V USB input and 1.5 A per channel

Because the charger runs from a standard USB port it cannot accept mains voltage directly, removing the risk of 110 V hazards and foreign plug incompatibility. The maximum charge current is capped at 1.5 A per slot, so high-capacity cells take longer to fill than they would on a dedicated high-current charger. Alkaline and non-3.7 V chemistries are not supported.

Handles 10440 to 26650 sizes

Adjustable sliders accept lengths from 10440 up to 26650, covering common formats such as 14500, 16340, 18650 and 22650. The charger detects each cell and picks the optimum current automatically, while red and green LEDs show charging and full status. Protection circuits guard against over-charge, over-heat, over-voltage and short-circuit.

How it compares

Measured against everything we stock in Disposable & Rechargeable Batteries, at today’s prices. Recalculated every night.

Price $6.99
Cheaper than about 89% of the 985 comparable items (median $28.99).

Specifications

Product
Product typeChargers

Questions about this item

Which charging current should I select for my 18650 cells?

Each bay can be set up to 1.5 A per channel; the charger also detects the battery and picks the optimum current automatically.

What does the 5 V USB input mean when I plug this into a power bank?

The 5 V supply eliminates high-voltage risk and lets you charge 3.7 V Li-ion cells from any USB port, power bank or car adapter.

Does the USB port limit which battery sizes I can charge simultaneously?

No, the four independent bays adjust mechanically for lengths from 10440 up to 26650 and charge all four at once without interference.

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