Don't Buy Cheap Power Tool Batteries Until You Watch This

I bought a "$26.80 12Ah DeWalt Battery" from Temu to see if it’s a massive scam or the ultimate money-saving hack for the shop. When an authentic DeWalt battery costs upwards of $150-$320, the temptation to buy cheap knockoffs is huge—especially when you need to keep power-hungry tools running all day. But are these cheap lithium-ion batteries actually safe, and do they even hold the capacity they claim on the sticker? In this video, I put these Temu batteries through a rigorous true-capacity bench test, calculate the actual cost per amp-hour, and show you the exact "Quarantine Charging Station" I built to prevent my shop from burning down. Whether I'm working locally or running chainsaws up in Vermont, having extra batteries on hand is crucial, but it requires a healthy respect for lithium chemistry. Make sure to subscribe! Next up, I’m cracking open the DOA battery I got a refund on to see if we can salvage the cells and build a custom pack. 👇 Gear & Safety Equipment Used in This Video: Vevor 17x17x22 Flammable Liquids Cabinet: https://share.temu.com/NTTeCmg2FXC $16 Plug-In Dumb Timer: (no longer for sale / couldn't find link) Inline Volt/Amp Meter: (similar) https://a.aliexpress.com/_mPgSZ0H Multimeter Test Leads: https://share.temu.com/L6p8WYywSxC ⏱️ Video Chapters: 0:00 - The $26 Temu DeWalt Battery vs. Authentic DeWalt 01:21 - Why Temu Gave Me a Full Refund 02:00 - The Danger of Cheap Battery Management Systems (BMS) 04:17 - My $97 Fireproof "Quarantine" Charging Setup 06:38 - How to Test True Battery Capacity 07:51 - Setting Up the Bench Test & Wiring 16:42 - The Problem with Tool Cut-Off Voltages 18:23 - Field Testing: DeWalt vs. Temu Knockoff 21:08 - The Final Results: True Amp Hours Revealed 23:44 - Cost Per Amp-Hour Math (The Ultimate Verdict) 28:18 - What’s Next? (Battery Teardown Teaser) Tags/Keywords: Temu DeWalt battery, knockoff power tool batteries, fake DeWalt battery test, battery capacity test, cheap lithium ion batteries, battery fire safety, Vevor fire cabinet, DIY battery charging station, DeWalt 20V max, DeWalt 60V flexvolt, tool battery rebuild, cost per amp hour, tool review, Temu tool review.