DIY500AMP Cell Intelligence
LG H51
A middle-ground cell for moderate current with useful runtime.
Manufacturer data sheet
Cell at a glance
LG manufacturer draft; marked NOT FINAL VERSION
Full technical specification
| Store SKU | LG-H51-21700-B1 |
|---|---|
| Manufacturer / model | LG INR21700H51 |
| Format / chemistry | 21700 / Li-ion |
| Rated capacity | 5000 mAh |
| Nominal voltage | 3.64V |
| Full-charge voltage | 4.2V |
| Discharge cutoff voltage | 2.85V for field cycling; 2.50V for capacity measurement |
| Standard charge current | 2.5A |
| Maximum charge current | 5A only at 25C to 45C; lower limits apply at other temperatures |
| Continuous discharge rating | 25A only at 10C to 25C; temperature-dependent derating applies |
| Initial internal resistance | 12 +/-6 mOhm at 1kHz |
| Weight | 70.5g |
| Dimensions | Diameter <=21.27 mm; height <=70.60 mm |
| Charge temperature range | Ambient -10C to 50C; cell surface -10C to 55C; temperature-dependent charge limits apply |
| Discharge temperature range | Ambient -20C to 55C; cell surface -20C to 70C |
| Cycle-life reference | 1000 cycles to >=80% initial energy (TBD), at 25 +/-2C: 5A charge / 15A discharge to 3.00V; rest 20min after charge / 45min after discharge. |
| Protection | Unprotected industrial cell. The finished device or battery pack must provide appropriate protection. |
Simple selection guide
Is this the right cell for your build?
Match the cell to the job, then confirm the manufacturer limits for the finished pack.Best match
General-purpose packs needing a practical mix of current capability, capacity, and cost.
A better alternative when
Choose a power cell for demanding loads, or a high-capacity cell when maximum runtime is the priority.
Application guide
Where this cell fits
General-purpose packs, moderate mobility, backup power
High-current loads and maximum-runtime builds
Vape and e-cigarette devices
Keep the finished pack within every manufacturer voltage, current, and temperature limit.
Engineering limits
Current limits
Manufacturer continuous-discharge ratings only. Pulse and over-current laboratory values stay on BatteryRealData.LG's draft specification requires charge and discharge current derating with temperature. Charge: 0.5A at -10C to 0C (3.90V, marked TBD), 1.5A at 0C to 10C, 2.5A at 10C to 25C, 5A at 25C to 45C, then 1.5A above 45C within the stated limits. Discharge: 7.5A below 10C, 25A at 10C to 25C, 20A at 25C to 45C, then 7.5A above 45C. Restart discharge only below 50C. Maximum ratings are not long-term pack design currents.
Show current and runtime examples Optional 1C references and idealized runtime estimates
Current envelope
Relative current values from the matched manufacturer data sheet. Bar length is comparative, not a recommendation.
Current and runtime translation
Idealized constant-current runtime based on nominal capacity. Real packs deliver less because voltage sag, heat, cutoff voltage, and losses matter.
Real discharge testing
Tested by BatteryRealData
A manufacturer-compliant test summary is not currently shown for this cell. Review the specification notes above. BatteryRealData provides separate laboratory context.
Only tests inside the matched data sheet continuous-current range are summarized here. BatteryRealData may separately include controlled pulse or over-current research; those laboratory stress tests are not product ratings or operating instructions.
View BatteryRealData laboratory testsRead before purchase and use
Safety warning for lithium-ion battery usage
Customers should understand lithium-ion battery handling and safety before purchase. Lithium-ion cells can cause fire, burns, venting, or explosion if misused, overcharged, shorted, crushed, punctured, overheated, or physically damaged.
Use only with a compatible lithium-ion charger, BMS, or protection circuit designed for the cell voltage, current, and temperature limits. Never leave batteries charging unattended. Charge and store on a fire-resistant surface away from combustible materials.
By purchasing and using lithium-ion cells, the user assumes responsibility for correct handling, storage, charging, pack design, and application suitability.
Important usage guidelines
- Not for use in e-cigarettes, vape devices, or similar devices.
- Always use in a protected battery pack or properly controlled test fixture.
- Do not exceed the data sheet maximum charge voltage.
- Do not discharge below the recommended system cutoff voltage.
- Do not charge or discharge outside the data sheet temperature limits.
- Do not carry loose cells in pockets, bags, or toolboxes where they can contact keys, coins, tools, or other metal objects.
- Store and ship cells in protective cases or insulated packaging.
- Do not use batteries with torn wrappers, missing insulator rings, dents, rust, odor, leakage, deformation, heat damage, or visible damage.
- Do not solder directly onto cell terminals. Use proper spot-welding methods only.
- Do not alter, dismantle, puncture, crush, burn, immerse in liquid, or expose cells to open flame.
- Keep away from children and pets.
Pass all safety information to end users to promote safe handling, correct pack design, and proper use.
Common questions
LG H51 FAQ
Does this cell include built-in protection?
No. It is an unprotected industrial cell. A compatible device or finished pack must provide over-charge, over-discharge, over-current, short-circuit, and thermal protection as required by the application.
Is the maximum current the normal operating target?
No. A manufacturer maximum is a limit under stated conditions, not an automatic long-term design target. Use headroom and validate the finished pack under the actual load, duty cycle, cooling, and temperature limits.
Can I solder directly to the cell?
No. Direct soldering can overheat and damage the cell. Use correctly configured spot welding and suitable interconnect material.
Can I mix this cell with another model or an older batch?
Do not mix different models, ages, capacities, internal-resistance groups, batches, or states of charge in one pack. Build with matched cells and balanced parallel groups.
Can I carry or store the cell loose?
No. Isolate the terminals in a protective case or insulated packaging. Never carry loose cells with keys, coins, tools, or other conductive objects.
