YWBL-WH18.5V/21V 15A 5S Li-ion Battery Board for Electric Power Tool 18560 Batteries

Used this board to build a 5S2P for my impact driver that originally came with Ni-Cd. Hooked this up with 10 x 18650 and have a brand new 4ah Li-ion pack that won't disappoint when needed for the 18v impact driver. This board comes with little metal pads, they are meant for spot welding. If you try to solder, you're going to have a hard time. Used a spot welder to connect the battery and the nickel on these landing posts in no time. The output/charging has to be soldered though. My driver demands about 10A peak and 1-3 running depending on the load. The peak is momentary to drive the screw in a 2x4 so the surge lasts about 3 seconds. This board has no problem supplying that. No overheating issues noticed. Says it can balance, but i didn't test to the efficiency of that. For the price its a good deal and depending on your project, may be a good fit for loads under 5 amps. It says 15 A, but from the looks of it don't think it will handle 300 watts (@20v) imo. I don't have an oscilloscope for further testing, but i won't use this for precision currents just based on it's wide tolerances mentioned in the product info.

I've just built a battery pack for a set of 18v Bosch tools. So far, it seems to work fine.I'm not good at soldering so I may not be the right person to review the ease of soldering but it was hard for me. The pads are very small and I had to use magnifying glasses to get it right. It took a long time and it was kind of nerve wracking.That said, it's a small board and it works fine.

Came as described

It did reduce power (but not stop power) to load when a cell dropped below 2.5v, but it failed the overload test with a loud pop, sparks shooting out and a puff of magic smoke.These devices are supposed to have built in over-current protection but it failed on this one.Strongly advise avoiding, or at the very least put your own correct fuse inline with the output!