Keszoox

5V Boost Converter + Li-ion Charger Module — 1A, 4.2V, LED Display, OVP/OTP (2-Pack)

5V Boost Converter + Li-ion Charger Module 1A, 4.2V, LED Display, OVP/OTP (2-Pack)

$7.60 USD

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5V Boost Converter + Li-ion Charger Module — 1A, 4.2V, LED Display, OVP/OTP (2-Pack)

This integrated boost converter and Li-ion charger module combines a 4.2V lithium battery charger with a 5V/1A boost converter in a single compact PCB. It enables you to build a complete DIY USB power bank — charge a single 18650 cell via USB input, then boost the cell voltage back to stable 5V for USB output. Supplied as a 2-pack for prototyping and production builds.

Key Specifications

Parameter	Value
Input Voltage	3.7V – 5.5V (USB 5V typical)
Charging Current	1A max
Charging Voltage	4.2V ±1%
Output Voltage	5V (boost regulated)
Output Current	1A max
Efficiency	Up to 85%
Discharge Stop Voltage	2.9V (cell protection)
Standby Current	8μA max
LED Indicator	Red flashing = charging / Red solid = full
Protections	OVP, short circuit, overload, overcharge, overdischarge, OTP
Charging Mode	Trickle + constant current + constant voltage + zero-voltage
Pack Quantity	2 modules

Why Choose This Module?

✅ All-in-one design — charger + boost converter in one PCB, no extra components needed
✅ Zero-voltage charging — recovers deeply discharged Li-ion cells
✅ 8μA standby current — minimal battery drain when idle
✅ Full protection suite — OVP, OTP, short circuit, overcharge, overdischarge
✅ LED charge indicator — clear charging status at a glance
✅ 2-pack value — prototype one, deploy one