DIY500AMP Cell Intelligence
Samsung 50E
Best for low-current packs, backup power, and runtime-focused builds.
Manufacturer data sheet
Cell at a glance
Datasheet-verified specification
Full technical specification
| Store SKU | SAM-50E-21700-B1 |
|---|---|
| Manufacturer / model | Samsung INR21700-50E |
| Format / chemistry | 21700 / Li-ion |
| Rated capacity | 4900 mAh (minimum 4753 mAh) |
| Nominal voltage | 3.63V |
| Full-charge voltage | 4.2V |
| Discharge cutoff voltage | 2.5V |
| Standard charge current | 2.45A |
| Maximum charge current | 4.9A maximum; not for cycle life |
| Continuous discharge rating | 9.8A |
| Initial internal resistance | <=28 mOhm |
| Weight | 69.5g |
| Dimensions | Diameter <=21.25 mm; height <=70.80 mm |
| Charge temperature range | Ambient 0C to 45C |
| Discharge temperature range | Ambient -20C to 60C; cell-surface protection no higher than 70C |
| Cycle-life reference | 500 cycles >=3802mAh (80% rated); 2.45A charge / 4.9A discharge, 4.20-2.50V. Under the manufacturer test protocol; refer to the linked data sheet. |
| 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
Low-current electronics, lighting, backup systems, sensors, and gentle energy-storage duty.
A better alternative when
Choose a power or hybrid cell for tools, RC, UAV, high-watt mobility, or other demanding loads.
Application guide
Where this cell fits
Low-current runtime packs, energy storage, backup power
Moderate loads only after current and thermal validation
Power tools, RC / UAV, high-watt mobility, vape 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.Samsung specifies 2.45A standard charging and a 4.9A maximum that is not for cycle life. Continuous discharge is 9.8A. Discharge thermal protection must be set no higher than 70C at the hottest cell surface. Maximum ratings are not recommended long-term pack 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
Samsung 50E 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.
