My Actifit Report Card: December 12 2024

building a lithium battery pack, doing house chores

Dear friends,

Yesterday morning, I meditated for about 20 minutes in the morning and one hour in the late evening. Then, after breakfast, I started building lithium battery pack with small 18650 3600mAh lithium batteries.I used 21 of them in three rows and used 3S 40A BMS card, which can give 12.6 V DC output. The battery pack can yield 7x3600mAh = 25.2 AmpHr in calculation but the actual output will depend on the quality of each cell I think. In the afternoon, I wrapped the pack, finished soldering the BMS card and finally put it in a 12 V battery container.

I intend to use it with 180 W solar pump but when I charged it didn't seen to work as expected - it stopped charging at around 12.1V. I still need to figure out why. I think the pack had some bad cells in it although I have checked them all with my voltage meter. Actually, I need internal resistant tester to check the quality of the cell - I will try to get one. Although it was not a successful outcome, I got some experience about building a battery pack. Next time, I will carefully look for reliable good quality cells.

Yesterday, I also started building a soil mixer with an old steel barrel. I would like to mix soil and compost.

Those were some of the activities for yesterday.

@princekham
Myanmar
12th Dec 2024

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