Adding two speaker is very easy and provide a all-in-one boombox without thinking to add external ones.

But, yes, if you want you can also add a big external acoustic box....

I'm thinking of making a battery charger for my e-bike that can use my car's battery. The end-charge voltage of the e-bike battery is 42v, so you need a step-up that brings the 12 volts of the car battery to 42v with a current of 2-3 like that of the battery charger of the original e-bike.

I often run out of battery midday and not having the ability to recharge the battery with a 220V outlet is frustrating.

I got tired of using the blower or shaking cardboard when I make the barbeque to get the embers... I said to myself: are there more modern methods? Do I have everything I need? YESSS!!

FAN + Lipo Battery + Charge balacing board + wooden gun

OK..... This solution is not reccommended.

The switching power supply is too near to Speaker magnet and produce a udible buzzing during listening. But also fixing far from magnet, produce udible noise...