# Double the batteries. Double the runtime. Right?

**URL:** <https://forum.qoitech.com/t/double-the-batteries-double-the-runtime-right/573>\
**Category:** Tutorials\
**Created:** [May 21, 2026, 1:05pm UTC](https://forum.qoitech.com/t/double-the-batteries-double-the-runtime-right/573 "2026-05-21T13:05:02Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![mariahernandez](https://dub1.discourse-cdn.com/flex017/user_avatar/forum.qoitech.com/mariahernandez/32/491_2.png) [@mariahernandez](https://forum.qoitech.com/u/mariahernandez)\
**Post date:** [May 21, 2026, 1:05pm UTC](https://forum.qoitech.com/t/double-the-batteries-double-the-runtime-right/573/1 "2026-05-21T13:05:02Z")

</div>

![3S1P (3 AAA cells) vs. 3S2P (6 AAA cells) | Otii Product Suite](https://europe1.discourse-cdn.com/flex017/uploads/qoitech/original/1X/a8f020b68660e2fc86098cc6c928efd55bb6b757.png)

Not quite. In our latest test, we ran the same ESP32-based temperature sensor on two battery configurations:

🔋 3S1P (3 AAA cells)  
🔋🔋 3S2P (6 AAA cells)

…and got more than 2.5x the battery life.

The hidden factor isn’t capacity. It’s internal resistance.

Read the full breakdown using the Otii Battery Life Estimator 👇

[https://www.qoitech.com/blog/does-twice-the-batteries-mean-twice-the-runtime/](https://www.qoitech.com/blog/does-twice-the-batteries-mean-twice-the-runtime/)