diff --git a/content/post/battery-pack-building.md b/content/post/battery-pack-building.md
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+---
+title: "Battery Pack Building"
+type: post
+author: micha
+date: 2022-08-27T16:00:00+02:00
+url: /battery-pack-building/
+tags:
+ - DIY
+ - battery
+---
+
+I have inherited the following collection of battery packs, which were already at least 5 years old at this time:
+
+![image](/img/battery_packs.jpg)
+
+Two battery packs should now be built from them: One as power supply for my Yaesu FT-817 during portable operation and another bigger one from the remaining cells. For this I took all packs apart, charged each cell and then measured their capacity. I also needed do order a spot welder kit for this.
+
+After I received the spot welder kit, I assembled it and built the smaller battery pack (4s2p) of the two with 14,8V and a capacity of 6200mAh. Worked fine but I had to use a 100Ah battery as power source to make it actually weld.
+
+The spot welder:
+
+![image](/img/spot_welder_1.jpg)
+
+![image](/img/spot_welder_2.jpg)
+
+The battery:
+
+![image](/img/4s2p_1.jpg)
+
+![image](/img/4s2p_2.jpg)
+
+Then I've built the bigger battery pack in a 4s6p configuration with 14,8V and a cpacity of around 12,5Ah:
+
+![image](/img/4s6p_1.jpg)
+
+![image](/img/4s6p_2.jpg)
diff --git a/content/post/m17_md380_pistar_mmdvm.md b/content/post/m17_md380_pistar_mmdvm.md
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--- a/content/post/m17_md380_pistar_mmdvm.md
+++ b/content/post/m17_md380_pistar_mmdvm.md
@@ -151,7 +151,7 @@ We can now compile and flash the new firmware:
 ```
 # make clean
 # make
-# make mmdvm_hs_hat
+# sudo make mmdvm_hs_hat
 ```
 
 ## Usage
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