Robot batteries: runtime, peak current and a tight space
Robots ask a battery for three things at once: enough runtime to finish a task, enough peak current to move, and a shape that fits a body built for sensors and motors rather than for batteries. This page explains how those demands shape a pack choice.
Layered pack cross-section — the site's recurring diagram motif. It is a schematic, not a photograph of a product, factory or customer project, and it is not presented as a photograph of this company's factory.
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Runtime is the first robot question, and it is answered in watt-hours. A robot's motors, sensors and computing draw power unevenly — high during movement, lower during sensing — so an average draw multiplied by the required operating time gives the energy the pack must store, and dividing by nominal voltage gives the capacity. A pack chosen on capacity alone, without the average draw, may run half as long as expected, because a robot that moves constantly draws far more than one that mostly waits.
Peak current is the second question, and it is the one most often missed. A robot accelerating, lifting or climbing draws a surge that can be several times its average, and the pack's maximum continuous discharge current — listed per model on this site, for example 50A on the 12V 100Ah solar pack and 30A on the 48V e-bike pack — must cover the surge, not just the average. A pack that covers the average but not the peak will cut out or sag under load, and the robot will behave as if its battery were empty when it is not.
Space is the third question, and it is usually the hardest. Robot bodies are designed around function, so the battery cavity is often an irregular remainder rather than a clean rectangle. That is where the custom route earns its place: a pack built to the cavity, with the protection board and connector placed to suit the robot's wiring, rather than a catalogue pack forced into a space it was not made for. The custom inquiry for a robot should therefore include the cavity dimensions and a drawing if one exists, alongside voltage, capacity and peak current.
For a robot inquiry, state the robot type, its average and peak power draw, its required runtime, its cavity dimensions and its operating environment — indoor, outdoor, cold or warm. Those facts let the reply name a listed pack or identify a custom design. A request for a robot battery without them can only be answered with the same questions in return.
How to choose in this family
Fix the chemistry first, then the voltage and series count, then the capacity. Check the exact model listing for its own dimensions, protection, certificate set, minimum order and lead time — those values belong to that listing and do not transfer to other models. If no listed size fits your enclosure, the custom route covers custom dimensions and configurations; describe the enclosure and the electrical requirements rather than asking for a general price.
Related pages
Custom packs · 48V pack example · Choosing a custom pack · BMS boards
How to place an inquiry, step by step
- Send the device facts. Tell us the device type, the available space (length, width and maximum thickness), the nominal voltage you need, the capacity or runtime you target, and the peak current if your device has motors, radios or heaters.
- Name the model or the chemistry. If a page on this site matches, quote its model description and listing details. If nothing matches, say so and describe the chemistry and voltage you need, so the conversation starts on the custom route.
- Confirm documents and terms in writing. Ask for the certificate set for that exact model, confirm the minimum order, the price basis and the lead time for that listing, and confirm payment and warranty terms before you pay. Terms stated for one model listing do not transfer to another model.
- Agree the sample step. Confirm whether the next step is a listed sample, an engineering sample for a custom design, or a small trial order, and what test you will run on arrival — fit in the enclosure, runtime, or peak-current behaviour.
Send all of this in one message through the contact page: device type, space, voltage, capacity, peak current, model description if you have one, and the documents you need. That is the whole inquiry — no separate form, no account, no extra step.
What to send us now
Send one message with your device type, the space the pack must fit, the voltage and capacity you need, the peak current if it matters, and the model description if a page on this site already matches. Add the documents you need — certificates are available upon request — and whether you need a listed model or a custom design. Use the contact page or write to [email protected], or call +86-755-25629920. A specific message like that is what turns a range of hundreds of models into a short, answerable question.