For battery cells, review the product description for real-world current recommendations, testing notes, and application guidance. Manufacturer maximum ratings should be treated as limits, not the best target for long-term pack health.
Description
LG H51 21700 Cell – 5000mAh – High-Performance Lithium-Ion Battery - Check availability
Continuous discharge: 25A
The LG H51 21700 5000mAh is a high-performance lithium-ion cell designed for applications that need strong runtime, solid energy density, and dependable current delivery.
With 5000mAh typical capacity (4900mAh minimum), 3.64V nominal voltage, and up to 25A continuous discharge in its main operating band, this cell is well suited for e-bikes, scooters, power tools, high-output battery packs, and custom 21700 performance builds.
LG Energy Solution specifies the H51 for battery-pack use only and identifies E-Motorcycle as the intended application. It is best used in properly engineered packs with suitable BMS/BMU protection and temperature monitoring.
Specifications:
| Model | LG INR21700H51 |
| Size | 21700 |
| Typical Capacity | 5000mAh |
| Minimum Capacity | 4900mAh |
| Nominal Energy | 18.2Wh |
| Minimum Energy | 17.6Wh |
| Nominal Voltage | 3.64V |
| Max Voltage | 4.20V |
| Min Discharge Voltage | 2.50V |
| Max Continuous Discharge | 25A (10°C to 25°C) / 20A (25°C to 45°C) / 7.5A (-20°C to 10°C and 45°C to 55°C); re-discharge only after cooling below 50°C |
| Standard Charge Current | 2.5A (0.5C) CC/CV to 4.20V, 50mA cut-off |
| Max Charge Current | 5.0A (25°C to 45°C) / 2.5A (10°C to 25°C) / 1.5A (0°C to 10°C and 45°C to 50°C) / 0.5A (-10°C to 0°C) |
| Standard Discharge | 1.0A (0.2C), 2.50V cut-off |
| Chemistry | Li-ion |
| Positive Terminal | Flat Top |
| Protected | No |
| Rechargeable | Yes |
| Initial AC Impedance | 12 ±6mΩ at 1kHz |
| Initial DC Impedance | 20 ±6mΩ at 50% SOC |
| Approx. Weight | 70.5g Max |
| Dimensions | ≤21.27mm diameter × ≤70.60mm height |
| Operating Temperature | Atmosphere — Charge: -10°C to 50°C / Discharge: -20°C to 55°C; Cell surface — Charge: -10°C to 55°C / Discharge: -20°C to 70°C |
| Storage Condition | Shipping state: -20°C to 55°C within 1 month; -20°C to 45°C within 3 months; -20°C to 25°C within 1 year; recovery ≥80%; storage humidity under 50% |
| Cycle Life | ≥80% of initial energy after 1000 cycles (5.0A charge to 4.2V / 15.0A discharge to 3.00V, per stated test condition) |
| Datasheet | Datasheet |
Applications:
- ✅ High-Performance E-Bikes
- ✅ Electric Scooters
- ✅ Power Tools
- ✅ Heavy-Duty Battery Packs
- ✅ Custom 21700 Builds
DIY500AMP.COM Design – High-Performance, Pack-Ready Power
⚠️ Safety Warning for Lithium-Ion Battery Usage
This cell is intended for battery-pack use only with protective circuitry. Mishandling, short-circuiting, overheating, overcharging, puncture, or physical damage can cause fire, burns, or serious injury.
LG Energy Solution states that this cell is not intended for use outside of a battery pack and not for stand-alone, consumer-replaceable use in products such as e-cigarettes, lanterns, flashlights, or similar devices. Use only in a properly engineered battery pack with suitable BMS/BMU protection and temperature monitoring.
Important Usage Guidelines:
- Battery Pack Use Only – Not for Stand-Alone Consumer Use
- Use with Proper Protective Circuitry / BMS / BMU
- Spot Weld Only – Do Not Solder Directly
- Do Not Use if Wrap Is Damaged
- Prevent Shorts – Keep Away from Loose Metal Objects
- Not for E-Cigarettes, Lanterns, or Flashlights
Orders ship from Florida when inventory is available. Lithium-ion cells require proper handling, protected packs, correct chargers, and safe storage. Do not solder directly to battery terminals.
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Wow, these cells are great!
I purchased some of these tabless cells to try on my 1S 3" HD Toothpick drone build, and, albeit a bit heavy for 1S, it flies pretty well. Not a freestyle monster, but an endurance beast with decent send. These cells shrug off the demands of a BETAFPV Matrix HD AIO flight controller/12A ESC and some 1202.5 11000KV motors. I'm getting 15+ minutes of speedy flight time from a single cell trying not to go below 3.2V, and about 20+ minutes cruising. Love these cells and will definitely buy more when time comes, only from DIY500AMP, who are terrific!
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