Custom Engineering · Platform and Payload Customization

Battery and Power Configuration

Battery configuration decisions show up as maintenance and logistics problems long after the flight test is over.

8 of 10Method note

Overview

Match cell chemistry and voltage class to the platform's control architecture, not only to the energy requirement.
Define the charge, discharge and storage policy as a written procedure, including cold weather handling.
Plan the number of packs, the charge channels and the transport arrangement as one system.
Track cycles and depth of discharge per pack; without records, packs fail unpredictably.

The binding constraint is usually charging, not flying

Programmes plan aircraft and flight hours and then find the limit was never the aircraft — it was how many battery cycles the field setup can deliver in a day. Charging capacity, charge time, transport and available site power together determine achievable sorties, and they are usually the cheapest thing to fix and the most commonly overlooked.

The arithmetic is simple and worth doing before any equipment is bought. Sorties per day times packs per sortie times charge time per pack, divided by chargers operating in parallel, gives the charging hours required. Compare that to the working day. If they are close, there is no slack and any disruption removes sorties.

The second arithmetic is energy: packs per day times pack energy is what the field setup must deliver, and it determines whether site supply, a generator, a vehicle supply or stored power is needed. Remote sites get difficult here, because delivering meaningful energy off-grid is a logistics task in its own right.

Configuring the pack inventory

Pack count is set by the sortie plan plus margin, and margin matters because packs fail, degrade and get damaged. A programme sized exactly to its plan has no answer to one failed pack. Size to the plan plus a spare set, and rotate so that no single pack accumulates disproportionate cycles.

Rotation and identification are what make the inventory manageable. Packs should be numbered, cycled in rotation rather than by convenience, and their usage recorded. That is what makes degradation visible before it becomes a flight-day problem and what makes a failure diagnosable rather than mysterious.

Storage state matters as much as charge state. Packs stored at full charge for long periods degrade faster; packs stored deeply discharged are worse. Where a programme has a clear off-season, define a storage state and follow it. Our battery charging and field power note covers the field practice in detail.

Charging practice and the conditions that shorten pack life

Temperature dominates pack life and it cuts both ways. Cold reduces usable capacity in flight, which is a real range consideration on mountain and winter work. Heat accelerates degradation during charging and storage. A field setup that charges hot packs in direct sun will consume its inventory faster than one that manages temperature.

Charge discipline is the rest of it: do not charge packs that are still hot from flight, avoid deep discharge, keep packs within their stated temperature range during use and charging. These are unglamorous and they are the difference between an inventory that lasts a season and one that lasts three.

Charging location should be deliberate. Charge separated from flammable material, on a non-combustible surface, and where a thermal event would not propagate to other packs or equipment. This is a proportionate precaution and it is cheap to implement in a field setup.

Transport rules and the damaged-pack procedure

Lithium batteries are classified as dangerous goods for transport, and the rules on quantity, state of charge, packaging and mode are real and vary by jurisdiction. Where a programme moves packs by road, air or sea, establish the applicable rules before planning, because they can determine how many packs may be carried at all.

A damaged pack needs a written procedure, not a corner of the store. A pack that has been in an incident, has been punctured or is swollen should be removed from service and handled according to that procedure rather than set aside and forgotten.

Our responsible procurement and conduct note sets the general standard we apply, and delivery, training and documentation is where pack handling procedures get written into something a crew is trained against.

Commissioning a power configuration

Send sorties per day, aircraft and pack type, working day length, site power availability, temperature range and transport constraints. We will size the pack inventory, the charging setup and the field power source, and tell you where the constraint on your programme actually sits.

Where the pattern is unusual — very high daily sortie counts, remote multi-day sites, extreme temperatures — the setup should be designed rather than assembled, and the design includes the transport and safety rules that apply.

Contact our engineering team, and see range and loaded endurance assessment for the flight-side figure that the charging setup has to support.