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. Six of these cells need a charging setup that can keep up — at home and on the go. This bundle pairs 6 genuine LG INR18650-HE4 Flat Top batteries with the NITECORE UMS4 (a 4-bay smart LCD charger for fast, monitored charging at your desk) and the NITECORE UI1 (an ultra-compact single-slot charger for travel or topping off a spare cell). Together, all 6 batteries can be charged at once — 4 in the UMS4, and the 5th and 6th staggered through the UI1 — with full visibility into every cell's health.
LG INR18650-HE4 (Flat Top) Specifications
|
| Item |
Spec |
| Model |
LG INR18650-HE4 (Flat Top) |
| Nominal Capacity |
2500mAh |
| Nominal Voltage |
3.6V |
| Max Continuous Discharge |
20A |
| Max Charge Voltage |
4.2V±0.05V |
| Max Charge Current |
4000mA (fast charge) |
| Discharge Cutoff Voltage |
2.5V |
| Chemistry |
INR (Lithium Nickel Manganese), high-drain |
| Cell Size |
18650 (approx. |
|
Φ18.28mm × 64.98mm) |
Terminal Type |
Flat Top — level positive terminal, suited for devices requiring full-surface contact |
Typical Use |
Power tools, high-output flashlights, e-bikes, hoverboards, and other high-drain applications |
|
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 Chargers: NITECORE UMS4 + NITECORE UI1
NITECORE UMS4 — 4-Bay Smart LCD Charger
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USB-C input with QC support: up to 4,000mA total output, up to 3,000mA on a single bay with a QC adapter
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Independent 4-bay control: charge and monitor each battery separately
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Real-time LCD display: shows battery health (Good/Poor), internal resistance, charging current, voltage, charged capacity, and charging time
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3 automatic charging modes: CC, CV, and -dV/dt, selected automatically based on battery type and charge level
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Manual adjustment: set charging voltage and current (300mA–3000mA) for specialized battery types
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Safety features: automatic internal resistance detection, reverse-polarity and short-circuit protection, overtime charging protection, and over-discharged battery activation/restoration
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Fire-retardant PC/ABS housing with built-in temperature regulation
NITECORE UI1 — Compact Single-Slot Charger
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Type-C input: automatically adapts to the optimal charging mode, works with power banks, solar panels, and USB adapters
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Up to 1000mA output with automatic CC/CV mode selection
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Trickle charging protects over-discharged cells and extends battery lifespan
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Over-discharge activation for protected Li-ion batteries
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Ultra-lightweight: just 40.5g — ideal for travel, a backup charge, or topping off the 6th cell while the UMS4 handles the other 4
Supported Battery Types & Voltage
NITECORE UMS4 — 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: up to 3,000mA per bay (QC mode) / 4,000mA total
NITECORE UI1 — compatible with 3.6V/3.7V Li-ion/IMR batteries, including the LG HE4 (18650): 10340, 10350, 10440, 10500, 12340, 12500, 12650, 13450, 13500, 13650, 14430, 14500, 14650, 16500, 16340(RCR123), 16650, 17350, 17500, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 21700, 22500, 22650, 25500, 26500, 26650 Output voltage: 4.2V±1% · Output current: up to 1000mA
Compatibility Notes
Both the UMS4 and UI1 use spring-loaded contacts that accommodate Flat Top batteries securely without any adapter. LG HE4 Flat Top cells measure about 65.0mm, well within the compatible battery range of both chargers.
Note: The HE4 supports fast charging up to 4000mA, but the UMS4 (up to 3,000mA per bay) and UI1 (up to 1,000mA) charge more conservatively. Expect a longer, gentler charge cycle than a high-current dedicated charger — better for long-term cell health.
What's Included
- LG INR18650-HE4 Flat Top Battery × 6
- NITECORE UMS4 4-Bay Charger × 1
- NITECORE UI1 Single-Slot Charger × 1
- USB-C Charging Cables × 2
- User Manuals × 2
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 genuine, compatible chargers such as the NITECORE UMS4 and UI1
- 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
FAQ
Q: Can I charge all 6 batteries at the same time? A: Yes. The UMS4 charges 4 batteries independently and simultaneously, while the UI1 can charge a 5th battery alongside it — or you can stagger the 5th and 6th through the UI1 if only one is used at a time.
Q: Are LG HE4 Flat Top batteries safe to charge in both chargers? A: Yes. Both the UMS4 and UI1 automatically recognize Li-ion chemistry and apply the correct charging voltage (4.2V) and current for HE4 cells.
Q: What's the difference between the UMS4 and UI1 in this bundle? A: The UMS4 is a 4-bay charger with an LCD screen showing detailed real-time data (battery health, internal resistance, voltage, capacity) and faster QC charging up to 3,000mA per bay. The UI1 is a single-slot, ultra-compact charger (40.5g) best suited for travel or charging one battery at a time.
Q: Will Flat Top batteries sit properly in both charger slots? A: Yes. Both the UMS4 and UI1 have spring-loaded/open contact designs that accommodate Flat Top and Button Top cells without any adapter.
Q: How do I check if a 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: Why does the HE4 charge slower on these chargers than its rated max? A: The HE4 supports fast charging up to 4000mA, but the UMS4 (up to 3,000mA per bay) and UI1 (up to 1,000mA) charge more conservatively. This results in a longer charge time but a gentler cycle that's easier on the cell's long-term health.
Q: What's in the box? A: 6 LG INR18650-HE4 Flat Top batteries, 1 NITECORE UMS4 charger, 1 NITECORE UI1 charger, 2 USB-C charging cables, and user manuals for both chargers.
