I found this little Sony camera battery thrown away with some others alkaline dead batteries. On the little label glued to the battery, it was written that it contains Li-ion cells rated 680mAh. I was so curious to see the shape of the cells inside, test them and see if they were reusable for som... view more

• DIY
• battery
• salvage
• recycle

Around 2 years back I've made a huge portable Bluetooth speaker but that had some errors with the circuit. Then, I've made a small portable bluetooth speaker that had a good circuit. Now, I'me making a new version for the big speaker but with all the errors corrected. It will have a 6S battery pa... view more

• DIY
• speaker
• battery
• bluetooth
• portable
• circuit
• rechargable

This is a very basic tutorial and there are already a lot of guides on how make something like this. But, since this is part of a future project (electric longbaord), well I'm doing this first step and show you how to connect the batteries, add charging protection. I'll use some Samsung INR18650 ... view more

• circuit
• li.ion
• pack
• battery
• BMS
• homemade
• DIY