NITECORE UMS4 4-Slot Smart Charger & 4x LG INR18650-HE4 Flat Top Battery Kit (2500mAh 20A)

Why This Bundle

The LG HE4 is the successor to the popular HE2, carrying the same 2500mAh capacity and 20A continuous discharge rating with improved cell consistency. A set this capable deserves a charger that can handle every cell at once while keeping close watch on their health. This bundle pairs 4 genuine LG INR18650-HE4 Flat Top batteries with the NITECORE UMS4, a QC-enabled 4-slot charger with a detailed LCD display, independent bay control, and multiple layers of protection — ready to use straight out of the box.

LG INR18650-HE4 (Flat Top) Specifications

Note: This is a high-drain, unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.

The Charger: NITECORE UMS4

• USB-C input with QC support: up to 4,000mA total output; up to 3,000mA on a single bay with a QC adapter
• QC Mode output: 3,000mA×1 / 2,000mA×2 / 1,000mA×4 — Standard Mode: 2,000mA×1 / 1,000mA×2 / 500mA×4
• Independent 4-bay control: charge and monitor up to 4 batteries separately, with each bay unaffected by the others
• Detailed real-time LCD display: shows battery health (Good/Poor), internal resistance, charging current, voltage, battery type, charged capacity, charging time, cut-off voltage, and charging mode
• 3 automatic charging modes: CC, CV, and -dV/dt, selected automatically based on battery type and charge level
• Manual adjustment: set charging voltage and current for specialized battery types
• Safety features: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation/restoration
• Fire-retardant PC/ABS housing with built-in temperature regulation
• Universal power input: works with wall adapters, power banks, and solar panels via USB-C

NITECORE UMS4 – Supported Battery Types & Voltage

Compatible with 3.6V/3.7V Li-ion, 3.8V Li-ion, 3.2V LiFePO4, and 1.2V Ni-MH/Ni-Cd batteries, including the LG HE4 (18650) in this bundle:

IMR/Li-ion/LiFePO4: 10440, 14500, 14650, 16500, 16340 (RCR123), 16650, 17350, 17500, 17650, 17670, 17700, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22500, 22650, 25500, 26500, 26650, 26700 Ni-MH/Ni-Cd: AA, AAA, AAAA, C, D

Output current: up to 3,000mA per bay (QC mode) / 4,000mA total

Compatibility Notes

The UMS4 uses spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. LG HE4 Flat Top cells measure about 65.0mm, well within the UMS4's compatible battery range. All 4 cells in this bundle can be charged simultaneously across the charger's 4 independent bays.

Note: When only 1 bay is in use, the UMS4 can reach up to 3,000mA with a QC adapter — close to the HE4's 4000mA max fast-charge rating. With all 4 bays in use, each will charge more gently at up to 1,000mA (QC mode) or 500mA (standard mode).

What's Included

• LG INR18650-HE4 Flat Top Battery × 4
• NITECORE UMS4 4-Bay Charger × 1
• USB-C Charging Cable × 1
• User Manual × 1

Safety Tips

• Store batteries in a proper case, keeping them away from loose metal objects to prevent short circuits
• Never disassemble, puncture, burn, or submerge the batteries
• Charge only with a genuine, compatible charger such as the NITECORE UMS4
• The HE4 is an unprotected, high-drain cell intended strictly for compatible, purpose-built devices — do not use it in unauthorized or modified equipment
• Never discharge below 2.5V or charge above 4.2V
• Flat Top batteries are commonly used in devices with spring or flat-contact battery holders (e.g., battery packs and power tools) — check your device's terminal requirements before use

FAQ

Q: Can the NITECORE UMS4 charge LG HE4 Flat Top batteries safely? A: Yes. The UMS4 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for HE4 cells, with real-time monitoring on its LCD display.

Q: Can I charge all 4 batteries at the same time? A: Yes. The UMS4 has 4 independent bays and can charge all 4 cells simultaneously — up to 1,000mA per bay in QC mode, or 500mA per bay in standard mode, when all 4 slots are used at once.

Q: Will Flat Top batteries sit properly in the UMS4 charger bays? A: Yes. The UMS4's spring-loaded contacts are designed to accommodate both Flat Top and Button Top cells without any adapter or modification.

Q: How do I know if an HE4 battery is degraded? A: The UMS4's LCD display shows battery health as "Good" or "Poor" along with internal resistance readings, making it easy to spot cells that have aged or lost performance.

Q: Is 20A continuous discharge safe for everyday devices? A: No — the HE4 is a high-drain cell intended strictly for devices specifically engineered for high continuous discharge, such as certain  power tools, and high-output flashlights. Always check your device's battery requirements before use.

Q: Can I power the UMS4 with a power bank while traveling? A: Yes. The UMS4 has a USB-C input and works with wall adapters, power banks, and solar panels.

Q: How does the HE4 compare to the HE2? A: Both share the same 2500mAh capacity and 20A continuous discharge rating. The HE4 is LG's later revision, generally offering improved manufacturing consistency over the original HE2.

Q: How fast will 4 HE4 batteries charge at once? A: With all 4 bays occupied, each battery charges at up to 1,000mA (QC mode) or 500mA (standard mode) — slower than the HE4's 4000mA fast-charge rating, but a safer, more even charge across all 4 cells simultaneously.

Q: What's in the box? A: 4 LG INR18650-HE4 Flat Top batteries, 1 NITECORE UMS4 charger, a USB-C charging cable, and a user manual.