DIY500AMP Cell Intelligence
Reliance RS50
High output with strong runtime. Best when the pack needs both current delivery and energy density.
Manufacturer data sheet
Cell at a glance
Manufacturer datasheet matched
Full technical specification
| Store SKU | REL-RS50-21700-B1 |
|---|---|
| Manufacturer / model | Reliance INR21700-RS50 |
| Format / chemistry | 21700 / Li-ion |
| Rated capacity | 5000 mAh (minimum 4950 mAh) |
| Nominal voltage | 3.6V |
| Full-charge voltage | 4.2V |
| Discharge cutoff voltage | 2.5V |
| Standard charge current | 2.5A |
| Maximum charge current | 15A |
| Temperature-limited continuous rating | 70A with 80C cell-surface cutoff |
| Initial internal resistance | <=4 mOhm |
| Weight | 67g |
| Dimensions | Max Diameter 21.35mm, Max Height 70.30mm |
| Charge temperature range | Cell surface 0C to 60C; follow manufacturer charging conditions |
| Discharge temperature range | Cell surface -40C to 80C |
| Cycle-life reference | 400 cycles with >= 60% capacity retention at 25+/-3C: 8A CC-CV charge to 4.2V with 100mA termination, rest 30 min; 40A discharge to 2.5V or 75C cutoff. Under manufacturer section 7.10. Other qualified cycle protocols are listed in the datasheet. |
| 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
High-load packs that also need strong runtime, including RC, UAV, mobility, tools, and compact performance builds within the data sheet limits.
A better alternative when
Choose a high-capacity cell when maximum runtime at modest current matters more, or a dedicated power cell when minimum voltage sag matters more than capacity.
Application guide
Where this cell fits
RC / UAV, power tools, e-bike / mobility, runtime-focused packs
Energy storage and backup systems
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.The displayed continuous limit comes from the matched manufacturer data sheet. Use design headroom and validate heat in the finished pack.
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
This Shopify summary includes only tests at or below the published 70A with 80C cell-surface cutoff continuous-current ceiling.
- Raw capacity
- 5111 mAh
- Raw energy
- 17.36 Wh
- Max observed temp
- 75C
- Raw capacity
- 2319 mAh
- Raw energy
- 8.15 Wh
- Max observed temp
- 80C
These curves are observed laboratory results, not operating recommendations. Voltage and temperature are plotted against measured raw capacity for the selected run.
Displayed test-current range: 1A to 70A
- Best raw capacity
- 5111 mAh
- Best raw energy
- 18.42 Wh
- Published continuous-current ceiling
- 70A with 80C cell-surface cutoff
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 datasheet-range graphs and test resultsRead 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
Reliance RS50 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.
