🔋 I Built a Battery from Vape Cells… 1 Year Later It FAILED 😬 (Fixing It)

A year ago, I built a DIY battery pack using recycled lithium-ion cells recovered from disposable vape devices. It was a cheap experiment, and I wanted to see how well these recycled cells would perform in real-world applications.

But after approximately one year of use, something went wrong. The battery pack started failing, so it was time to open it up, investigate the problem, and see if it could be repaired.

🔧 What You'll See in This Video

• Disassembling the old DIY battery pack
• Inspecting recycled lithium-ion cells after one year
• Measuring cell voltage and identifying potential failures
• Rebuilding the battery pack using recovered vape cells
• Testing the repaired battery with power tools
• Sharing practical lessons from this long-term experiment

🔍 What Went Wrong?

Even though the battery worked for quite some time, recycled lithium-ion cells are not always predictable.

Different cells can have different capacities, internal resistance, and previous usage histories. Over time, weak cells can cause problems for the entire battery pack.

This is why testing individual cells before assembling a battery is so important.

💪 One Year Later – My Conclusions

Here are some lessons from this experiment:

• Recycled lithium-ion cells can be useful for DIY projects.
• Not every recovered cell is suitable for reuse.
• Testing cells is essential before building a battery pack.
• Battery performance can deteriorate over time.
• Even old Bosch power tools can continue working for years!

⚠️ Lithium Battery Safety

Lithium-ion batteries can be dangerous if handled incorrectly. Damaged, swollen, overheated, or unstable cells should not be reused.

Always use a properly designed battery management system (BMS), suitable cell protection, and appropriate charging equipment. Avoid short circuits, overcharging, and mixing incompatible cells.

Do not attempt to rebuild damaged battery packs without the necessary knowledge and equipment.