Drone battery is easy to buy when the aircraft is already on the market.
You find a battery with the right voltage, capacity and connector, place an order, and move on.
It becomes a different story when you are developing the drone yourself.
The battery may need to fit into a narrow compartment. The aircraft may require a particular voltage. The motors may pull a surprisingly high current during takeoff. Maybe the connector needs to sit on one side of the pack, or the battery needs to communicate with the drone’s power system.
At that point, a standard battery can become more of a limitation than a solution.
This is where working with a custom drone battery manufacturer can make sense.
For UAV companies, OEM battery development is not simply putting cells together. The battery needs to be designed around the aircraft.
Before developing a custom battery, it helps to understand how LiPo chemistry, voltage, capacity and discharge performance affect UAV battery selection. Our LiPo Battery for Drone: Complete Guide for UAV Manufacturers and Buyers provides a broader starting point.
The customization may involve:
Sometimes almost the entire battery needs to be developed from scratch.
That is why a useful OEM discussion should start with the UAV rather than with a battery catalog.
A UAV manufacturer may be choosing between high-energy and high-power cells, depending on the aircraft.
For example, a long-endurance mapping drone may place more emphasis on energy density.
A heavy-lift agriculture drone may need much stronger discharge performance.
An FPV platform has yet another requirement.
A custom drone battery manufacturer should therefore look at the aircraft’s actual power profile before recommending a cell.
Important parameters include:
The “best” cell depends on the job.
For endurance-focused UAV projects, 21700 Li-ion cells can be another option worth evaluating. See our guide to 21700 battery packs for drones for more details.
Depending on the project, the BMS may monitor:
The UAV may need information from the battery rather than simply receiving power.
That could include battery voltage, current, temperature, remaining capacity or other status information.
The exact BMS requirements depend on the aircraft’s electronics and communication architecture.
So it is better to define the BMS together with the drone manufacturer rather than adding a generic BMS at the end.
Then the prototype arrives.
The connector is facing the wrong direction.
The cable is too short.
The plug interferes with the battery compartment.
Now a seemingly small problem requires a mechanical change.
For OEM UAV batteries, connector selection should consider:
A drone used five times a day can put very different demands on a connector compared with a prototype flown once a week.
The physical shape can be just as important.
Imagine an aircraft with a battery compartment that is only 65mm high.
A standard battery may have enough capacity but physically cannot fit.
Another pack may fit but leave unused space.
For an OEM project, the battery housing can be designed around the available mechanical space.
Typical information includes:
Length × Width × Height
Maximum weight should also be provided.
If possible, the battery supplier should receive a drawing or 3D model of the battery compartment.
Even a simple dimension sketch is useful during the early stage.
Build samples first.
A typical development process might look like:
Requirements → Cell selection → Battery design → Prototype → Testing → Revision → Final sample → Mass production
The first prototype may not be perfect.
Perhaps the battery is 150g heavier than expected.
Maybe the cable needs to move.
Perhaps the pack gets warmer than expected during climbing.
That is normal during development.
The useful part is finding these problems while there are still ten prototype batteries on the workbench rather than 2,000 finished packs in production.
A battery can pass a capacity test and still behave differently when connected to the actual UAV.
For prototype testing, consider checking:
For example, if the battery has plenty of capacity but excessive voltage sag during takeoff, the problem may be the cell’s discharge capability rather than its capacity.
That distinction matters.
Prototype testing should also include proper charging, storage and inspection procedures. See our drone battery safety guide for practical battery handling advice.
This approach is useful for UAV companies that are still refining their aircraft.
Instead of:
“Please quote 10,000mAh drone battery.”
Try to provide:
Application: Mapping / Agriculture / Inspection / FPV / Other
Voltage: Required nominal voltage
Capacity: Target Ah or Wh
Continuous current: Normal operating current
Peak current: Maximum current
Dimensions: Maximum battery size
Weight: Maximum acceptable weight
Connector: Required connector
Quantity: Prototype and production quantity
If available, also provide motor, ESC and flight-time information.
The more accurate the input, the less guessing is involved during battery development.
You find a battery with the right voltage, capacity and connector, place an order, and move on.
It becomes a different story when you are developing the drone yourself.
The battery may need to fit into a narrow compartment. The aircraft may require a particular voltage. The motors may pull a surprisingly high current during takeoff. Maybe the connector needs to sit on one side of the pack, or the battery needs to communicate with the drone’s power system.
At that point, a standard battery can become more of a limitation than a solution.
This is where working with a custom drone battery manufacturer can make sense.
For UAV companies, OEM battery development is not simply putting cells together. The battery needs to be designed around the aircraft.
Before developing a custom battery, it helps to understand how LiPo chemistry, voltage, capacity and discharge performance affect UAV battery selection. Our LiPo Battery for Drone: Complete Guide for UAV Manufacturers and Buyers provides a broader starting point.
What Does Custom Drone Battery Actually Include?
When a customer says, “We need a custom battery,” there are usually several different things behind that request.The customization may involve:
- Cell type
- Cell configuration
- Voltage
- Capacity
- Discharge capability
- BMS
- Connector
- Cable length
- Housing
- Battery dimensions
- Weight
- Charging requirements
Sometimes almost the entire battery needs to be developed from scratch.
That is why a useful OEM discussion should start with the UAV rather than with a battery catalog.
Cell Selection Comes First
The cell is the foundation of the battery pack.A UAV manufacturer may be choosing between high-energy and high-power cells, depending on the aircraft.
For example, a long-endurance mapping drone may place more emphasis on energy density.
A heavy-lift agriculture drone may need much stronger discharge performance.
An FPV platform has yet another requirement.
A custom drone battery manufacturer should therefore look at the aircraft’s actual power profile before recommending a cell.
Important parameters include:
- Nominal voltage
- Capacity
- Continuous current
- Peak current
- Cell weight
- Internal resistance
- Operating temperature
- Expected cycle life
The “best” cell depends on the job.
For endurance-focused UAV projects, 21700 Li-ion cells can be another option worth evaluating. See our guide to 21700 battery packs for drones for more details.
BMS Design Is More Than a Protection Board
For Li-ion UAV battery packs, the BMS can play an important role in monitoring and protecting the battery.Depending on the project, the BMS may monitor:
- Cell voltage
- Pack voltage
- Current
- Temperature
- Overcharge
- Over-discharge
- Short circuit
- Battery condition
The UAV may need information from the battery rather than simply receiving power.
That could include battery voltage, current, temperature, remaining capacity or other status information.
The exact BMS requirements depend on the aircraft’s electronics and communication architecture.
So it is better to define the BMS together with the drone manufacturer rather than adding a generic BMS at the end.
The Connector Is Small Detail Until It Isn’t
Battery connectors are easy to overlook during the early design stage.Then the prototype arrives.
The connector is facing the wrong direction.
The cable is too short.
The plug interferes with the battery compartment.
Now a seemingly small problem requires a mechanical change.
For OEM UAV batteries, connector selection should consider:
- Maximum current
- Connector dimensions
- Installation direction
- Locking mechanism
- Cable length
- Polarity
- Number of mating cycles
A drone used five times a day can put very different demands on a connector compared with a prototype flown once a week.
Housing and Battery Dimensions Matter
Battery capacity is only one side of the design.The physical shape can be just as important.
Imagine an aircraft with a battery compartment that is only 65mm high.
A standard battery may have enough capacity but physically cannot fit.
Another pack may fit but leave unused space.
For an OEM project, the battery housing can be designed around the available mechanical space.
Typical information includes:
Length × Width × Height
Maximum weight should also be provided.
If possible, the battery supplier should receive a drawing or 3D model of the battery compartment.
Even a simple dimension sketch is useful during the early stage.
Prototype First, Production Later
One thing I would strongly recommend for UAV companies is not to jump directly from a quotation to a large production order.Build samples first.
A typical development process might look like:
Requirements → Cell selection → Battery design → Prototype → Testing → Revision → Final sample → Mass production
The first prototype may not be perfect.
Perhaps the battery is 150g heavier than expected.
Maybe the cable needs to move.
Perhaps the pack gets warmer than expected during climbing.
That is normal during development.
The useful part is finding these problems while there are still ten prototype batteries on the workbench rather than 2,000 finished packs in production.
Testing the Battery on the Real UAV
Laboratory testing is important, but the real aircraft tells a different story.A battery can pass a capacity test and still behave differently when connected to the actual UAV.
For prototype testing, consider checking:
- Takeoff current
- Cruise current
- Peak current
- Voltage sag
- Battery temperature
- Flight time
- Charging behavior
- Physical fit
- Connector temperature
- Battery communication
For example, if the battery has plenty of capacity but excessive voltage sag during takeoff, the problem may be the cell’s discharge capability rather than its capacity.
That distinction matters.
Prototype testing should also include proper charging, storage and inspection procedures. See our drone battery safety guide for practical battery handling advice.
Apsenx OEM Drone Battery Development
For UAV companies looking for an OEM drone battery, Apsenx can support several parts of the battery development process.Cell Selection
We can help evaluate suitable lithium battery cells based on voltage, capacity, current requirements, weight and application.BMS
The BMS can be selected or developed according to the battery’s protection and monitoring requirements.Connector
The battery connector, cable length and wiring arrangement can be matched to the UAV design.Housing
Battery dimensions and mechanical structure can be developed around the available battery compartment.Prototype
Prototype packs can be produced for initial testing before moving toward larger production quantities.This approach is useful for UAV companies that are still refining their aircraft.
What Information Should You Send to an OEM Battery Manufacturer?
A detailed inquiry usually gets a much more useful response.Instead of:
“Please quote 10,000mAh drone battery.”
Try to provide:
Application: Mapping / Agriculture / Inspection / FPV / Other
Voltage: Required nominal voltage
Capacity: Target Ah or Wh
Continuous current: Normal operating current
Peak current: Maximum current
Dimensions: Maximum battery size
Weight: Maximum acceptable weight
Connector: Required connector
Quantity: Prototype and production quantity
If available, also provide motor, ESC and flight-time information.
The more accurate the input, the less guessing is involved during battery development.