00:00Building DIY battery packs gets expensive fast, but safety board shouldn't break bank.
00:05Tested top 520 A Lithium BMS options under $8.
00:09Found cheap boards that handle drill motors, power banks, custom 18,650 builds without frying cells.
00:17First board, 3S-4S multi-current protection board for $3.12.
00:23Over 4,000 sold, 4.9-star rating.
00:26Built-in balance charging keeps cell drift low under heavy motor loads.
00:31Ideal pick for 12V drill battery rebuilds where peak start-up draw kills cheap circuits.
00:36Second option, 3S-5S balance BMS, also $3.12.
00:42High 4.8 rating across 4,000 buyers.
00:46Big win here is 5S support.
00:48Gives extra headroom of stepping up to 18V or 21V tool packs while keeping reliable over current cutoffs intact.
00:56Third board, Liisao 3S-4S BMS.
01:00Insane price, $0.85.
01:03Holds 4.7-star score with thousands shipped.
01:07Enhanced balance module prevents cell drift during charge cycles.
01:11Buy handful for cheap power bank projects, keep rest as spares in parts bin.
01:16Fourth pick, 2S-5S BMS at $3.16.
01:21Rated 4.8 stars with near 3,000 orders.
01:25Supports tiny 2S packs all way to 5S setups.
01:28Wide voltage versatility makes it perfect catch-all board for random Bluetooth speaker and drill mods.
01:35Fifth pick, premium 3S-4S drill motor BMS for $4.24.
01:41Perfect 5-star rating across near 3,000 builds.
01:44Robust MOSFET heatsinking handles 20A continuous draw without thermal throttling.
01:50Spend extra dollar here if motor pushes sustained high current.
01:54All board links in description below.
01:57Like video, subscribe for more DIY power builds, drop pack questions in comments.
02:02With the end of the mini-cold cost.
02:02Then what it's about?
02:0210-inch size.
02:03Now let's see if you can see any of these points.
02:03If you can see any of these points, you can see any of these points.
02:03See if you can see any of these points.
