Samsung 50S 21700 5000mAh 25A High Drain Li-ion Battery Cell - Genuine
Description
- Cell model: Samsung INR21700‑50S
- Nominal voltage: 3.6 V
- Full charge voltage: 4.2 V
- Capacity: 5000 mAh (typical, minimum ≥ 4800 mAh)
- Battery technology: Li-ion (INR chemistry)
- Max continuous discharge: 25 A (up to 35 A with temperature cutoff at 80 °C)
- Discharge cut-off voltage: 2.5 V
- Standard charge current: 2.5 A
- Max charge current: 6 A (up to 10 A per datasheet)
- Charging method: CC-CV to 4.2 V, cutoff at ~0.05–0.1 C
- Condition: Brand new
- Dimensions (Ø × length): 21.1–21.25 mm × 70.3–70.7 mm
- Weight: Approximately 70–72 g
- Operating temperature: Charge: 0–45 °C, Discharge: –20–60 °C
Pre-Welded Nickel Tabs
Ready-made output tabs welded to the cell pack allow for quick and reliable connection of electronics, BMS, or external contacts. Clean, low-resistance welds ensure durability and performance. Additionally, kapton tape is used to protect the pack from overheating and short circuits.
Suitable for:
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- Electric bicycles and scooters
- Power tool battery packs
- Energy storage systems
- DIY battery pack building (with BMS)
- Robotics and industrial applications
- Flashlights (when part of a managed battery pack)
Not suitable for:
-
- Vaping devices / e-cigarettes
- Consumer electronics without protective circuitry
- Loose battery use without proper housing or BMS
- Children’s toys or non-professional DIY use
General Battery Pack Handling Guide – Li-Ion
- ⚠️ Important Safety Notice
- This cell is not protected and NOT RECOMMENDED for use in e-cigarettes, vaping devices, or similar consumer applications. It is intended for use by professionals in assembling battery packs with proper BMS (battery management system) and safety circuits.
- ✅ Before Installation
- Inspect all cells for damage, swelling (Li-Ion), leakage or corrosion.
- Ensure correct polarity and clean terminal contacts.
- Do not mix different battery types or new with used cells.
- ⚙️ Cell Characteristics
- Li-Ion: Nominal voltage ~3.7V per cell (max 4.2V / min 3.0V).
- ? Charging
- Use chargers specifically designed for the chemistry type.
- Li-Ion: Always use a BMS or protection circuit. Charge in a fireproof location.
- NiMH/NiCd: Use a smart charger with peak detection. Avoid overcharging and trickle-charging NiCd long-term.
- ? Storage
- Store both types in a cool (15–25°C), dry place, away from direct sunlight.
- Li-Ion: Store at ~3.7V per cell (40–60% capacity) for long-term storage.
- ? Safety Tips
- Never short-circuit terminals or expose batteries to flame, heat, or water.
- Stop using if a battery shows signs of overheating, swelling, or leaking.
- Do not puncture or open sealed cells.
- ♻️ Disposal
- Dispose of all battery types at designated recycling points.
- Never throw in regular trash.