Samsung INR21700-50S 5000mAh 20A 21700 Battery 8-Pack with XTAR VC8 8-Slot LCD Charger – High-Output Power Reserve for Professional Fleet Operations, Heavy Equipment Maintenance & Large-Scale Field Crews

Why This Bundle

The Samsung 50S steps up from the 50E with the same 5000mAh capacity but a significantly higher discharge ceiling — 20A continuous without a temperature cutoff, or up to 35A with an 80°C thermal cutoff — making it a stronger choice for e-bikes, power tools, and drones that need both energy and real current delivery. 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 INR21700-50S 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 INR21700-50S Specifications

Note: Samsung's own product positioning lists the 50S for EV, e-bike, drone, power tool, and e-mobility applications, and explicitly states it is not intended for e-cigarettes, flashlights, RC cars, or electric skateboards.

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

• 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 50S's 2.5A standard charge current
• 5 adjustable current levels: 3A×1 / 2A×2 / 1A×4 / 0.5A×8 / 0.25A×8 — manually selectable to match your charging needs
• 8 independent charging slots: each bay monitored and controlled separately
• 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
• Storage Mode: charges or discharges batteries to their rated storage voltage to maximize battery lifespan
• Smart Battery Type Detection: automatically identifies the battery and selects the optimal charging strategy
• VA LCD Display: real-time voltage, current, mode, battery type, internal resistance, and charged capacity for every slot
• 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
• 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 50S (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 50S's 70.6mm length. Since the 50S 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 50S's rated charge speed, at the cost of fewer slots charging simultaneously.

What's Included

• Samsung INR21700-50S 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 50S is an unprotected cell intended for compatible, purpose-built devices such as EVs, e-bikes, drones, and power tools — 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 50S batteries safely? A: Yes. The VC8 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for 50S cells, with independent monitoring on each of its 8 slots.

Q: Is the Samsung 50S 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 EVs, e-bikes, drones, power tools, and e-mobility applications.

Q: How does the 50S compare to the 50E? A: Both share the same 5000mAh capacity, but the 50S has a meaningfully higher discharge ceiling — 20A continuous (35A with thermal cutoff) versus the 50E's 9.8A — making the 50S the better pick for applications that need more current alongside the capacity.

Q: Will 21700 batteries fit properly in the VC8? A: Yes. The VC8 accommodates battery lengths from 32mm to 76mm, which comfortably covers the 50S's 70.6mm 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 50S 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 INR21700-50S batteries, 1 XTAR VC8 charger, a USB-A to USB-C charging cable, and a user manual.