Why This Bundle
The Samsung 50E is a high-energy 21700 cell built for runtime, not extreme current — a genuine 5000mAh capacity in a moderate-drain package that's a common choice for e-bikes, power tools, and long-runtime battery packs. A set this size deserves a charger that can handle every cell at once while keeping tabs on their health. This bundle pairs 8 genuine Samsung INR21700-50E batteries with the XTAR VC8, an 8-bay Type-C charger with real capacity testing, internal resistance detection, and independent monitoring for every slot — ready to use straight out of the box.
Samsung INR21700-50E Specifications
| Item |
Spec |
| Model |
Samsung INR21700-50E (Flat Top) |
| Typical Capacity |
5000mAh |
| Minimum/Rated Capacity |
4900mAh (standard) / 4753mAh (rated, 1C discharge) |
| Nominal Voltage |
3.6V |
| Max Continuous Discharge |
9.8A |
| Standard Charge Current |
2.45A |
| Maximum Charge Current |
4.9A |
| Charge Cutoff Voltage |
4.20V |
| Discharge Cutoff Voltage |
2.5V |
| Chemistry |
Li-ion, energy-focused |
| Cell Size |
21700 (approx. Φ20.25mm × 70.8mm, max weight 69g) |
| Terminal Type |
Flat Top only |
| Protection Circuit |
None (unprotected cell) |
| Typical Use |
E-bikes, power tools, drones, energy storage systems, robotics, professional battery pack builds |
Note: Samsung's own product positioning specifies the 50E for ESS, power tools, drones, medical devices, robots, and EV applications — and explicitly notes it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards. It's an energy/runtime cell, not a high-drain one.
This is an unprotected cell — avoid mixing with batteries of a different brand, model, or charge state, and inspect the wrap for damage before every use to prevent short circuits.
The Charger: XTAR VC8
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Type-C input with QC3.0 support: up to 3A on a single bay when battery resistance is low enough — the closest match here to the 50E's 2.45A standard charge current
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5 adjustable current levels: 3A×1 / 2A×2 / 1A×4 / 0.5A×8 / 0.25A×8 — manually selectable to match your charging needs
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8 independent charging slots: each bay monitored and controlled separately
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Real Capacity Test (Grading Mode): on CH1–CH4, the VC8 tests true capacity through a charge–discharge–charge cycle at a stable 300mA discharge current, revealing whether a battery's stated capacity is accurate
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Storage Mode: charges or discharges batteries to their rated storage voltage to maximize battery lifespan
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Smart Battery Type Detection: automatically identifies the battery and selects the optimal charging strategy
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VA LCD Display: real-time voltage, current, mode, battery type, internal resistance, and charged capacity for every slot
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Multiple Safety Protections: over-current, overcharge, over-voltage, and short-circuit protection; automatically stops after full charge; reverse-connection and over-discharge activation for protected cells
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Built from fire-retardant PC/ABS material, with a built-in "Three-Stage Lithium Battery Charging System" (Patent No. 201720828840.6)
XTAR VC8 – Supported Battery Types & Voltage
Compatible with 3.6V/3.7V Li-ion/IMR/INR/ICR batteries, including the Samsung 50E (21700) in this bundle:
10440, 14500, 14650, 16340, 17500, 17670, 18350, 18490, 18500, 18650, 18700, 20700, 21700, 22650, 25500, 26650
Also compatible with 1.2V Ni-MH/Ni-Cd batteries: AAAA, AAA, AA, A, SC, C
End-of-charge voltage: 4.20±0.05V (Li-ion) / 1.45±0.1V (NiMH) · End-of-charge current: <120mA
Compatibility Notes
The VC8's slider-style contacts accommodate battery lengths from 32mm to 76mm, comfortably fitting the 50E's 70.8mm length. Since the 50E has a relatively large 5000mAh capacity, charging speed matters here: with all 8 slots occupied, the VC8 defaults to a gentler 0.5A per slot, which will take a while to fully charge a set of 5000mAh cells. If you're in a hurry, manually selecting the higher current levels (up to 3A on a single slot) will get individual cells closer to the 50E's rated charge speed, at the cost of fewer slots charging simultaneously.
What's Included
- Samsung INR21700-50E Battery × 8
- XTAR VC8 Charger × 1
- USB-A to USB-C Charging Cable × 1
- User Manual × 1
Safety Tips
- Store batteries in a proper case, keeping them away from loose metal objects to prevent short circuits
- Never disassemble, puncture, burn, or submerge the batteries
- Charge only with a genuine, compatible charger such as the XTAR VC8
- The 50E is an unprotected cell intended for compatible, purpose-built devices such as e-bikes, power tools, and engineered battery packs — it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards
- Never discharge below 2.5V or charge above 4.2V
FAQ
Q: Can the XTAR VC8 charge Samsung 50E batteries safely? A: Yes. The VC8 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50E cells, with independent monitoring on each of its 8 slots.
Q: Is the Samsung 50E suitable for flashlights? A: No. Samsung's own product positioning explicitly states this cell is not intended for flashlights, RC cars, or electric skateboards. It's built for e-bikes, power tools, drones, energy storage, and similar runtime-focused applications.
Q: Will 21700 batteries fit properly in the VC8? A: Yes. The VC8 accommodates battery lengths from 32mm to 76mm, which comfortably covers the 50E's 70.8mm length.
Q: Can I charge all 8 batteries at the same time? A: Yes. At the default automatic setting, all 8 can charge simultaneously at up to 0.5A per slot. Manually selecting a higher current level (up to 3A) will use fewer slots at once but charge those cells noticeably faster.
Q: How do I test if a 50E battery has lost capacity? A: Use the VC8's Grading Mode on CH1–CH4. It runs a charge–discharge–charge cycle to measure true capacity, so you can identify batteries that no longer meet their rated mAh.
Q: Does the VC8 require a special power adapter for fast charging? A: For the fastest speeds (2A/3A settings), a QC3.0-compatible USB-C adapter is required. Without QC3.0, charging current will be limited.
Q: What's in the box? A: 8 Samsung INR21700-50E batteries, 1 XTAR VC8 charger, a USB-A to USB-C charging cable, and a user manual.
