18V 10-Cell 21700 Battery Replacement Case for Milwaukee M18 48-11-1865 - DIY Repair Kit for 6.0Ah and 8.0Ah Batteries (Battery Not Included)

This is a great product, I had a number of 21700 cells in my shop, and with this kit put together a massive 8 amp hour battery for my Milwaukee drill. You need a spot welder to connect the batteries like this one: https://www.amazon.com/dp/B0BJPBC9WS?ref_=ppx_hzsearch_conn_dt_b_fed_asin_title_1&th=1

The product worked once I followed the youtube video, slowed it down to about 25% speed, and soldered the plates onto the batteries and connected them to the control board. A spot welder is not required but HIGHLY encouraged. Trying to solder onto lithium batteries (not included) can be very challenging. If you do not have rosin flux you will NEED to buy some or make your own. Solder will NOT stick to these batteries or the included plates without it. An easy home DIY recipe for soldering flux is to use a 1:1 mixture of rubbing alcohol and phosphoric acid which is the main ingredient in some rust stop and rust removers. Check the label to be certain it contains phosphoric acid. You can use Baking soda and water to stop the acid and clean it off afterwards. This is will allow your solder to stick to your battery ends. Set your solder iron to near maximum temperature (800-850F), use a wide/large tip and minimize the amount of time you apply heat to the batteries. No more than a 2-3 seconds at a time. Apply a thin layer of your flux solution to all metal you wish to solder onto and watch the video on assembly of the rebuild kit. There is a QR code included on the instructions. Take GREAT care not to touch groups of batteries to each other with your metal tools or the plates otherwise you will instantly burn up and ruin your project. You can purchase a simple spot welder on amazon for around $40 which will make the rebuild fast and easy. Good luck. I do recommend this product.

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The battery pack case itself looks genuine and assembled as advertised. The one main concern is the main positive and negative plates that are soldered on the bottom side of the board are very thin especially for these larger capacity 21700 cells. I did my best to double up nickel strips without de soldering the existing strips.I put it together and it works well with my Milwaukee tools.If the circuit board was assembled with heavier positive and negative buss I would probably give it a 5

The negative strip under the board can't handle any power might be ok on impact driver. Won't charge to full battery gets close but the charger never goes green.

After spending close to $200 and giving the battery moderate use, it lost capacity. When I saw the Janllenton kits, I tried it. Replaced a few cells, but the main problem was the Milwaukee battery management system (bms). The Janllenton kit has everything you need to replace the defective parts, except the batteries. You'll need a spot welder, but once built, the battery works like new. Super happy and didn't have to buy another Milwaukee battery.

Works great. Nickel is .20mm thick. Not so sure it's pure nickel. The plastic case isn't as durable as M18 stock battery. Went together good, and charges just fine.

We used this and some 21700 cells to craft a fully operational Milwaukee Tools 18V M8 battery. We tested it and it worked well and charged fine for routine work with a pole chainsaw and a leaf blower. The instructions were minimal, but if you are willing to do your own spot welds, the wiring diagram is probably enough for you. Some soldering is needed to attach the battery contacts to the BMS. The only challenge we had is that the terminal metal contacts were too thick to weld to one another with the small handheld portable spot welder we bought for purpose. The metal is pretty thick and Im not sure it is even nickel. We had to buy a more powerful spot welder to get that to work. At highest power, fully charged, it did the job. Spotwelding the batteries to the contacts was easier.We were new to this task. My son picked up the unit assembled with batteries but without the welds in place. One of the battery contacts shifted over and developed a short with the one next to it, quickly burning my son's hand. After a week he had recovered so we decided to spot weld the thing once piece at a time more methodically with some tape to hold lose bits in place and things went well. This was a fun and painful learning experience for my son. I'm sure he'd do it again. T'was but a flesh wound.