Why This Bundle
The Molicel P45B is the newer, refined follow-up to the P42A — a 4500mAh typical capacity (7% more than the P42A) with the same 45A continuous discharge rating, but a meaningfully lower impedance and a much stronger fast-charge capability. 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 Molicel INR21700-P45B 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.
Molicel INR21700-P45B Specifications
| Item |
Spec |
| Model |
Molicel INR21700-P45B (Flat Top) |
| Typical Capacity |
4500mAh |
| Minimum Capacity |
4300mAh |
| Nominal Voltage |
3.6V |
| Max Continuous Discharge |
45A (80°C thermal cutoff) |
| Standard Charge Current |
4.5A |
| Maximum Charge Current |
13.5A (60°C cutoff, 3C fast-charge capable) |
| Charge Cutoff Voltage |
4.20±0.05V |
| Discharge Cutoff Voltage |
2.5V |
| Typical Impedance |
~7mΩ AC (30% SOC) / ~15mΩ DC (50% SOC) |
| Chemistry |
Li-ion, ultra-high-power |
| Cell Size |
21700 (approx. Φ21.55mm × 70.15mm max, approx. weight 70g) |
| Terminal Type |
Flat Top (Button Top also available) |
| Protection Circuit |
None (unprotected cell) |
| Typical Use |
Power tools, EVs/PHEVs, high-drain battery pack builds — Molicel recommends assembly in a pack with its own protection circuit |
Important: Molicel's official documentation recommends the P45B be assembled into a pack with a proper protection circuit — it's built as a high-power cell for engineered battery systems, not as a casual standalone consumer replacement cell.
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 P45B's 4.5A standard charge current, though still below it
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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 Molicel P45B (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 P45B's 70.15mm length. Given this is a high-power cell with a demanding 4.5A rated charge current, the VC8 won't match the P45B's full rated charge speed even on a single slot, but manually selecting the higher current levels (up to 3A on one slot) gets meaningfully closer than the default 0.5A-per-slot setting used when all 8 bays are occupied.
What's Included
- Molicel INR21700-P45B 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 P45B is an unprotected, ultra-high-power cell intended for use within a properly engineered battery pack with its own protection circuit — do not use it as a standalone replacement cell in casual consumer devices
- Never discharge below 2.5V or charge above 4.2V
FAQ
Q: Can the XTAR VC8 charge Molicel P45B batteries safely? A: Yes. The VC8 automatically detects Li-ion chemistry and applies the correct charging voltage (4.2V) and current for P45B cells, with independent monitoring on each of its 8 slots — though it won't reach the cell's full 4.5A rated charge speed.
Q: How does the P45B compare to the P42A? A: The P45B is the newer generation — 7% more typical capacity (4500mAh vs. 4200mAh) at the same 45A continuous discharge rating, with meaningfully lower impedance and a much stronger fast-charge capability (up to 13.5A/3C vs. the P42A's 8.4A).
Q: Is the P45B meant for use in standalone devices like flashlights? A: Molicel's official documentation recommends assembling this cell into a pack with its own protection circuit. It's built for power tools, EVs/PHEVs, and engineered high-drain battery packs rather than as a casual standalone drop-in cell.
Q: Will 21700 batteries fit properly in the VC8? A: Yes. The VC8 accommodates battery lengths from 32mm to 76mm, which comfortably covers the P45B's 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 P45B 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 Molicel INR21700-P45B batteries, 1 XTAR VC8 charger, a USB-A to USB-C charging cable, and a user manual.
