GPS tracker batteries: size, standby time and transmission peaks
A GPS tracker is a study in contrasts: it must last for days or weeks, yet it spends most of that time asleep; it must transmit powerfully, yet it must fit in a housing small enough to hide. The battery choice sits exactly at that tension, and this article explains how to resolve it.
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Standby dominates, peaks decide
A tracker's average current is low because the device sleeps between fixes, but its peak current during a GPS fix and a cellular transmission is high — often tens or hundreds of times the sleep current. Battery sizing that uses only the average current will overestimate life, because the peaks lose energy to internal resistance and to the voltage drop they cause; sizing that uses only the peak current will oversize the battery, because the peaks are brief. The correct calculation uses both: the sleep current over the sleep duration, plus the energy of each fix-and-transmit cycle, multiplied by the reporting frequency.
Reporting interval is therefore a battery decision disguised as a software setting. A tracker reporting every minute needs several times the energy of one reporting every hour, and a tracker that reports on movement rather than on a fixed interval needs an energy model based on the use pattern, not on a single interval figure. Before choosing a battery, fix the reporting pattern — interval, fix time, transmission duration — and size from that pattern, with margin for cold weather and for ageing.
Size, capacity and the 803040 anchor
The housing sets the ceiling. A tracker housing of roughly credit-card footprint and 8 mm thickness can take a cell like the 803040 listing cited on this site: 3.7 V, 1000 mAh, 8.0 x 30 x 40 mm, with GPS among its listed applications, a 300-times cycle life, a 1-piece minimum order, an enquiry range of $1.10–1.50 and a 7-day lead time for that listing. Those values describe that listing only — another 803040 listing states 450 mAh with different terms — so a tracker inquiry should name the 1000 mAh listing explicitly.
One thousand milliamp-hours in that outline is a reasonable middle for a compact tracker: enough for days of periodic reporting, small enough for a discreet housing. A tracker needing weeks of life will need either a larger housing, a lower reporting frequency, or a lower-power design — there is no battery that repeals the arithmetic. Conversely, a tracker with a larger housing should not default to the same cell: a larger cell, or a small pack, may serve it better, and the capacity guide on this site explains how to scale the choice.
Environment, ageing and replacement
Trackers live in vehicles, on assets and outdoors, where temperature swings are the norm. Cold reduces usable capacity and increases internal resistance, so a tracker that performs in summer may report less often — or fail to transmit — in winter. Heat accelerates ageing. A tracker battery should therefore be specified against the operating temperature range, not room temperature, and the supplier should be asked what the listing's figures assume. Where a listing states no temperature range, that absence should be treated as a question, not as an assurance.
Ageing and replacement complete the picture. A tracker battery cycled daily or kept at full charge in a hot vehicle ages faster than the headline cycle figure suggests, and a tracker designed for a multi-year deployment needs either a replaceable battery or a capacity margin that absorbs ageing. For a sealed tracker, margin is the only option; for a tracker with a replaceable cell, the replacement's availability over the deployment life matters as much as its first-year performance. State the deployment length in the inquiry, and size for the end of that deployment, not for the first month.
What to send with a tracker inquiry
A complete tracker inquiry states the housing dimensions, the reporting pattern, the average and peak currents if measured, the operating temperature range, the deployment length, and whether the battery is replaceable. With those facts, the supplier can confirm whether the 1000 mAh listing fits and lasts, or whether a different cell or a pack is the honest answer. Without them, the reply can only be a general recommendation — and a general recommendation is how trackers end up with batteries that die a week before the deployment ends.
Test before deploying at scale. Fit the candidate cell in the real housing, run the real reporting pattern through temperature extremes if possible, and measure the achieved life against the calculated life. A week of testing on a handful of trackers is cheaper than a fleet-wide battery replacement, and it turns the battery from a specification debate into a measured fact.
One more question worth asking
Ask how the tracker behaves when the battery runs low, because a tracker that dies silently is worse than one that dies loudly. A well-designed tracker sends a low-battery alert while it still has energy to transmit, giving the operator a window to recover it; a tracker that simply stops leaves the operator guessing whether the asset moved, the device failed, or the battery faded. The low-battery threshold, the alert mechanism and the reserve energy after the alert are therefore part of the battery specification, not a software detail to be settled later. Confirm them with the battery choice, and test the low-battery behaviour on a real device before deployment, so the fleet's end-of-life behaviour is a known procedure rather than a surprise.
Related pages
GPS trackers · 803040 GPS cell · Capacity selection · High-discharge
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 shape. If a page on this site matches, quote its model number and listing details. If nothing matches, say so and describe the shape — flat, round, curved or ultra-thin — 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 listed enquiry price range 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 shape, 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 number if you have one, and the documents you need. That is the whole inquiry — one message, no account, no extra step.
What to send us now
Send one message with your device type, the space the battery must fit, the voltage and capacity you need, the peak current if it matters, and the model number if a page on this site already matches. Add the documents you need — certificates available upon request — and whether you need a listed model or a custom shape. Use the contact page and address it to the sales team by first name as published there. A specific message like that is what turns a catalogue of hundreds of models into a short, answerable question.