If you've browsed our battery packs, you've probably noticed each one lists a specific Molicel cell — P28A, P30B, P42A, P45B, or P50B. These aren't just model numbers; they represent real differences in capacity, discharge rate, and how a battery performs under load. Choosing the right cell type can be the difference between a pack that struggles under your drone's power demands and one that delivers consistent, reliable performance flight after flight.
This guide breaks down what each cell offers and which applications they're best suited for.
A Quick Primer on Cell Naming
Molicel's cell names follow a pattern: the number generally relates to the cell's nominal capacity in hundreds of mAh, and the letter indicates the generation or design revision (e.g., "B" cells are typically refinements of earlier "A" cells with improved internal resistance and charge rates).
It's also worth noting that P28A is built on the 18650 cell format, while P30B, P42A, P45B, and P50B are 21700 cells — a physically larger format that allows for higher capacity and better thermal performance. This is why packs built with 21700 cells (P30B and above) are generally better suited to higher-drain applications.
Cell-by-Cell Breakdown
Molicel P28A (18650, ~2800mAh)
The P28A is a dependable 18650 cell offering moderate capacity with a solid discharge rating, making it well suited for applications where weight savings matter and current draw is moderate. In our lineup, P28A-based packs are a good fit for FPV and lighter-duty flying where you want a balance of capacity and pack weight.
Best for: FPV builds, lighter drones, cost-sensitive applications where extreme discharge rates aren't required.
Molicel P30B (21700, ~3000mAh)
The P30B improves on the P28A platform with a significantly higher continuous discharge capability and faster charging support, while moving to the larger 21700 format. This makes it a strong choice for packs that need to handle higher current draw without the bulk of larger-capacity cells.
Best for: Mid-size drones, applications needing higher discharge headroom than P28A can offer without jumping to a larger cell.
Molicel P42A (21700, ~4200mAh)
The P42A is known for its balance of high capacity and high continuous discharge rating, making it one of the most versatile cells in demanding applications. It performs reliably under sustained high-current loads, which is exactly what surveillance and survey drones need during long missions.
Best for: Surveillance drones, aerial mapping, and applications requiring stable performance over extended flight times.
Molicel P45B (21700, ~4500mAh)
Building on the P42A platform, the P45B offers higher energy capacity while maintaining similarly strong continuous discharge performance. This translates to longer runtimes without sacrificing the power delivery needed for demanding loads — making it a popular choice for our higher-capacity 6S and 12S packs, including our VTOL and cargo drone batteries.
Best for: VTOL aircraft, cargo drones, agricultural platforms, and any application where both capacity and discharge performance matter.
Molicel P50B (21700, ~5000mAh)
The P50B is currently Molicel's flagship high-performance 21700 cell, combining the highest capacity in this lineup with excellent low-impedance, high-discharge characteristics — supporting very high continuous discharge currents. Packs built with P50B cells also benefit from improved cycle life compared to earlier cells, meaning more charge cycles before noticeable capacity loss.
Best for: Heavy-lift surveillance drones, professional and defense-grade UAVs, and any application where maximum capacity and discharge performance are priorities.
Comparison at a Glance
| Cell | Format | Approx. Capacity | Relative Discharge | Best Use Case |
|---|---|---|---|---|
| P28A | 18650 | ~2800mAh | Moderate | FPV, lightweight builds |
| P30B | 21700 | ~3000mAh | High | Mid-size drones, higher current draw |
| P42A | 21700 | ~4200mAh | High | Surveillance, survey, mapping |
| P45B | 21700 | ~4500mAh | High | VTOL, cargo, agricultural |
| P50B | 21700 | ~5000mAh | Very High | Heavy-lift, professional, defense-grade UAVs |
Note: Capacity and discharge figures are approximate, based on manufacturer specifications. Actual pack-level performance depends on cell configuration (series/parallel arrangement), BMS design, and operating conditions.
How Cell Choice Connects to Voltage & Capacity
Picking the right cell is only one part of the equation — you'll also need the right voltage configuration (S-rating) and pack capacity for your drone. If you haven't already, check out our guide How to Choose the Right Drone Battery: A Voltage & Capacity Guide for a full breakdown of how S-ratings, mAh, and connector types come together to match a battery to your drone.
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