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Michael Clemens 2023-01-02 20:25:09 +01:00
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content/post/battery-benchmark.md → content/post/how-long-can-i-pota-with-6200mah.md
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@ -1,13 +1,13 @@
---
title: "How long can I POTA with 6200 mAh?"
title: "How long can I POTA with 6200mAh?"
type: post
author: micha
date: 2023-01-02T16:00:00+02:00
date: 2023-01-02T18:00:00+02:00
tags:
- Ham Radio
- battery
- POTA
url: /battery-benchmark/
url: /how-long-can-i-pota-with-6200mah/
---
I've recently built two battery packs, one with six 26650 cells (14.V, 6200mAh) and one with 24 26650 cells (14.4V, 12500mAh). You can read more about them here: [DK1MI.radio: Battery Pack Building](/battery-pack-building/).
@ -33,23 +33,27 @@ I've taken measurements every 30 minutes that can be taken from the following ta
| Minutes | Voltage RX | Voltage TX | consumed charge | PA output | TRX battery |
| ----------- | ----------- | ----------- | ----------- | ----------- |----------- |
| 30 | 13.3V | 13.0V | 360 mAh | 42W | 97% |
| 60 | 13.2V | 12.9V | 724 mAh | 42W | 94% |
| 90 | 13.1V | 12.8V | 1084 mAh | 42W | 91% |
| 120 | 13.0V | 12.8V | 1446 mAh | 42W | 90% |
| 150 | 12.9V | 12.8V | 1774 mAh | 42W | 89% |
| 180 | 12.9V | 12.8V | 2142 mAh | 42W | 88% |
| 210 | 12.9V | 12.8V | 2580 mAh | 42W | 88% |
| 240 | 12.9V | 12.8V | 2800 mAh | 42W | 88% |
| 270 | 12.8V | 12.7V | 3223 mAh | 40W | 86% |
| 300 | 12.7V | 12.5V | 3564 mAh | 39W | 86% |
| 330 | 12.6V | 12.5V | 3815 mAh | 39W | 0% |
| 360 | 11.8V | 11.5V | 4161 mAh | 35W | 0% |
| 30 | 13.3V | 13.0V | 360mAh | 42W | 97% |
| 60 | 13.2V | 12.9V | 724mAh | 42W | 94% |
| 90 | 13.1V | 12.8V | 1084mAh | 42W | 91% |
| 120 | 13.0V | 12.8V | 1446mAh | 42W | 90% |
| 150 | 12.9V | 12.8V | 1774mAh | 42W | 89% |
| 180 | 12.9V | 12.8V | 2142mAh | 42W | 88% |
| 210 | 12.9V | 12.8V | 2580mAh | 42W | 88% |
| 240 | 12.9V | 12.8V | 2800mAh | 42W | 88% |
| 270 | 12.8V | 12.7V | 3223mAh | 40W | 86% |
| 300 | 12.7V | 12.5V | 3564mAh | 39W | 86% |
| 330 | 12.6V | 12.5V | 3815mAh | 39W | 0% |
| 360 | 11.8V | 11.5V | 4161mAh | 35W | 0% |
The internal battery of the Xiegu dropped below 10V after 320 minutes which led to an automatic shutdown. If you take the reported percentage into account, there seems to be something wrong with either the battery or the measurement.
I've stopped the experiment after 330 minutes when both the output power of the amplifier and the battery voltage has dropped significantly.
## Remarks
Each (factory fresh) cell had 3300mAh which should result in 6600mAh for the pack. The cells were used and I measured a capacity of 6200mAh with the help of an electric load. During the above experiment the power meter measured a consumption of 4161mAh but when I recharged the battery afterwards, the charger claimed to have charged 6202mAh.
## Verdict
The battery seems to be a good fit for portable operations for to 5.5 hours. I was honestly surprised how stable the battery voltage is and I also assumed that more current would have drawn. The internal battery of the Xiegu also has a sufficient reserve for around 5 hours. I am not sure how much I can trust the measurements of the el cheapo battery power meter.
The battery seems to be a good fit for portable operations for to 5.5 hours. I was honestly surprised how stable the battery voltage is over the time of the discharge. The internal battery of the Xiegu also has a sufficient reserve for around 5 hours. I am not sure how much I can trust the measurements of the el cheapo battery power meter, the electric load or of the charger. The only truth, however, is the result in hours of experimentation.