Product overview
The CNHL Long Range Series BAK 50D 21700 Li-ion Battery Cell is a rechargeable cylindrical cell for custom battery construction, with a marked capacity of 5000mAh and a cell voltage of 3.6V. It is intended to balance stored energy and power capability in long-range FPV, efficient fixed-wing aircraft and UAV power systems. The 21700 designation describes a size class approximately 21mm in diameter and 70mm long, rather than exact dimensions for this model. As an individual cell, it requires integration into a suitably designed pack.
The 50D is positioned for endurance-focused aircraft that also need current headroom during takeoff, climbing and other higher-load flight conditions. Series connections increase pack voltage, with 4S and 6S among the possible configurations; parallel connections increase capacity and distribute the load between matched cells. Using 50D cells, a 2P arrangement provides 10000mAh and a 3P arrangement provides 15000mAh. These configuration choices serve different purposes, and the finished pack must match the aircraft's voltage requirements and propulsion load.
Safe pack current depends on parallel cell count, electrical interconnections, wire gauge, connector and thermal conditions. Construction requires appropriate cell matching, insulation and wiring, while charging and operation must remain within the selected cell's voltage, current and temperature limits. For an aircraft installation, suitability depends on both steady cruise demand and the higher loads encountered during takeoff or climbing, rather than capacity alone.
Specifications
| Specification | Value & conditions |
|---|---|
| Manufacturer and model | CNHL Long Range Series BAK 50D 21700 Li-ion Battery Cell |
| Marked capacity | 5000mAh |
| Cell voltage | 3.6V |
| Performance direction | Power and energy balance |
| Application starting point | Custom battery packs balancing stored energy and power capabilityBattery pack requires useful energy density with additional power headroom. |
| Cell architecture | Rechargeable cylindrical 21700 lithium-ion cell |
| Physical size class | Approximately 21mm diameter and 70mm lengthApproximate 21700 size-class dimensions; exact dimensions vary by manufacturer and cell model. |
| Supplied product form | Individual battery cell for custom pack construction |
| Integration applications | Long-range FPV, efficient fixed-wing aircraft, UAVs and other endurance-focused power systemsFinished pack design and propulsion current must remain within cell electrical and thermal limits. |
| Series integration | Series connection increases pack voltage; 4S and 6S are example configurations.Series-connected cells in a correctly designed battery pack. |
| Parallel integration | Parallel connection increases capacity and allows load sharing; 1P, 2P and 3P are example configurations.Appropriately matched cells in a correctly designed battery pack. |
| 2P pack capacity | 10000mAh50D cells connected in a 2P configuration. |
| 3P pack capacity | 15000mAh50D cells connected in a 3P configuration. |
| Current capability dependencies | Safe pack current depends on parallel cell count, interconnections, wire gauge, connector and thermal conditions.Finished battery pack using 50D cells. |
| Assembly requirements | Requires cell matching, electrical interconnections, insulation and wiring within specified voltage, current and temperature limits.Multi-cell battery pack assembly. |
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