Introduction
The Nitecore MPB21 Intelligent Battery System is a compact 3-in-1 kit built around a rechargeable 21700 i-series battery, a magnetic lantern (ML21) and the MPB21 magnetic power bank/charger cap. It's designed for lightweight EDC, outdoor use, and emergency kits — offering portable light, battery power and charging convenience in a tiny package.
What’s in the Kit
- NL2150HPi 21700 i-series battery: ~5000mAh rechargeable cell
- ML21 lantern: Magnetic small lantern/light (around 80 lumens / high CRI)
- MPB21 magnetic power bank / charger cap: Attaches to battery to enable USB output and charging
- Case & cables: Small protective case and USB cable included (kit dependent)
Key Features
- Compact magnetic modules snap to the battery for quick conversion between lantern and power bank modes.
- MPB21 supports USB output (acts as a tiny power bank) and can also be used to charge the 21700 battery when connected to USB power.
- ML21 provides usable ambient light (~80 lm) with high CRI for reading and close-up tasks.
- Built-in protections: auto-sleep, low-voltage protection and thermal/overload safeguards per manual instructions.
- Extremely lightweight and pocketable — ideal for EDC, camping, and emergency kits.
How the MPB21 Works
Attach the MPB21 cap to the positive (+) end of the 21700 i-series battery — the blue indicator will show charging/output status. You can connect a USB device to the MPB21 to charge it from the battery, or plug the MPB21 into USB power to recharge the battery. The unit includes safeguards: it may enter sleep mode when idle and will stop output if battery voltage is too low to protect the cell.
Estimated Price in the US
The full MPB21 kit (battery + ML21 + MPB21 cap, packaged) generally sells in the US in the approx $30–$70 range depending on retailer, promotions, and whether it's a bundled kit or individual components. Always compare official Nitecore store, authorized dealers, and major retailers for the best price and warranty coverage.
Pros & Cons
Pros
- Very compact 3-in-1 solution: battery, light and power bank.
- Strong magnets and modular design make it easy to switch functions.
- Good runtime for a small lantern (~many hours at low output).
- Useful emergency/EDC tool with modern safety features.
Cons
- Not meant to replace a full-size power bank for multiple full charges of a smartphone.
- Magnetic modules require correct alignment; base usage can be fiddly for first-time users.
- Availability and price vary by region and retailer.
Who Should Buy It?
Buy this if you want a lightweight emergency kit item, a compact lantern for reading or tent use, or a tiny backup power source for topping up small devices. It's particularly good for hikers, ultralight campers, and anyone wanting a neat multi-tool for daily carry.
FAQ
What battery comes with the MPB21 kit?
The kit typically includes an NL2150HPi 21700 i-series rechargeable battery rated around 5000mAh (confirm the exact SKU on your retailer's listing).
How much light does the ML21 produce?
The ML21 lantern module produces about 80 lumens (high CRI), enough for close-up tasks and ambient illumination.
Can MPB21 charge my phone fully?
The MPB21 can top up phones, but because it's a compact module using a single 21700 cell, expect partial charges — it's best as a top-up rather than a full primary charger for large phones.
Final Verdict
The Nitecore MPB21 Intelligent Battery System is a clever, pocketable power solution combining a real 21700 rechargeable battery, a magnetic lantern and a tiny power-bank/charger cap. It excels as an EDC or emergency item where space and weight matter — check seller listings for exact kit contents and warranty before buying.
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