Here are the photo how i connect my LED strip to my bike below, its very easy just solder each end (+ / -) terminal to connect to other different LED strip and route the cable to saddle pouch that carry the battery. The LED strip already have sticky 3M tape that stick firm and strong on any frame surface. Its like 10 minutes DIY work.  Cooking Megi is much harder than this.  Else go to car acessories shop they can do it for you if you can't solder.  For 12V battery you can find at any torch light shop of R/C toy shop.  The best this about this LED strip on bikes is they are 100% durable, ultra waterproof, lasts forever, superlight weight and doesn't look obvious (if your bike color is white). On seat post and handle bar i use black color LED strip to blend nicely with the bike outlook so no body knows it has an LED well hidden.  You can see the wire bridge-ing from battery power at seat post all the way to my handle bay without looking too clunky.  Total weight of the setup is far lighter than your rear light AA battery blinker.

LED strip installation photo: