“We need this device to run for 10 years on a battery.”– We hear this all the time.
A decade of autonomy is not about buying a bigger battery. It comes from precise engineering choices at both the schematic and chemistry level.
This is how we approach the power budget.
1. MCU Selection Matters
Everything starts with the brain. Microcontrollers behave very differently in sleep. An ESP32 works well for mains-powered gear. For battery sensors we pick something else. Why? An untuned ESP32 in deep sleep can still pull 5–10 µA.
Our choice
We often use Nordic nRF52, nRF53, nRF54 or STM32L. In system OFF they can drop into the hundreds of nanoamps. The gap between 5 µA and 500 nA adds years of life.
2. Zero-Leakage Topology (Power Switches)
Even if your MCU sleeps perfectly, your peripherals (sensors, external flash) might be “vampires,” draining power silently. We don’t just put them to sleep via software commands. We cut their power physically.
We implement high-side Load Switches (Power Gates) to completely isolate peripherals from the battery during sleep intervals. If it’s not working, it shouldn’t be connected and take power.
3. Device Operation Profile
People often think the radio burst is the main battery killer, whether it is BLE, LoRaWAN or NB-IoT. The real fight happens somewhere else. We look at the duty cycle.
Active time: short peaks of 100–300 mA during transmission.
Sleep: tiny static current for almost the entire lifetime.
A small leak of 10 µA wastes about 870 mAh over ten years. That is a third of the battery gone for nothing. This is why we chase every nanoamp.
4. Chemistry Class: Matching the Cell to the Mission
One battery type cannot cover every scenario. We pick the chemistry that fits the job. For “Install & Forget” (10 years): Li-SOCl2 The king of energy density with negligible self-discharge (<1%/year).
Challenge: They suffer from “passivation” and can’t handle high currents.
Fix: We pair them with a Supercapacitor (HPC) to handle the transmit bursts.
For Solar/Rechargeable Outdoor: LiFePO4 Standard Li-Ion batteries struggle in harsh weather and safety is a concern. LiFePO4 offers 2000+ charge cycles and is much safer and more stable at wider temperature ranges than standard Li-Po/Li-Ion.
For Compact Wearables: Li-Po / Li-Ion When size and weight are critical, and the device is charged weekly, the high energy density of standard Lithium-Ion wins.
Low-power design is not one trick. It is a stack of small choices that add up to real results. The right MCU. Clean power gating. A sleep profile with no leaks. A battery chemistry that fits the mission. When these parts work together, a ten-year device stops being a wish and becomes a number you can trust. And once the power budget is under control, you can focus on what the device should actually do, not how long it will survive.
This is where the real advantage shows up. Devices that last for years cut service costs, boost reliability, and build confidence in the field. They stay online, deliver data, and prove their value long after competing products fail. Power that lasts a decade is not magic. It is a method. And teams that treat energy as a design resource, not an afterthought, end up shipping the hardware that wins.
If you want to build a device that runs for years instead of months, we can help you get there. Reach out, and we will design a power budget that matches your mission and keeps your device alive for the long haul.
