I'm trying to expand capacity for a Duracell power bank (3.7v 2600 mAh) so I can power my portable RasPi project with it. I've taken a battery (3.7v 2800 mAH) from a cheap tablet and I'm wondering if I just connect the negative of the Duracell to the positive of the Tablet battery then take the negative of the Tablet battery and connect it back to the board of the Duracell power bank, if it will increase the capacity of the power bank and function normally or will it blow up in my face melting it Raiders of Lost Ark style?I'm a novice hobbyist and any pointers would be a huge help.A little more detail about my project: I'm installing a RasPi with RetroPie into an Original Gameboy case for a pretty cool emulator. I've found a step up chip to power the new display but have run into the issue of portable power. I'd like a little more capacity than the batteries that I've seen Ben Heck and others use. Thanks for your time and I hope to hear from anyone
I saw a link online that converted the display to accept 5v for power. However, the board for my display is not the same as the examples in the thread (apparently there are many different boards while the exterior looks the same).
What are your thoughts on attempting to modify the board so the display could be powered with 5 volts?
Um if you are using a 12V screen then use a standard gel battery or better still on of those Lithium packs that come with a charger from EBAY or the likes . They are light for mobile applications give you a nice power level and cheap enough you will need to use a small switch mode module for the 5V output.You should be safe on assuming 85% efficiency in what ever calcs' you are doing !
What are your thoughts on attempting to modify the board so the display could be powered with 5 volts?
I'd say if you have the knowledge to do it yourself, go ahead and do it. (i.e. if you're asking: don't)
If you don't have exactly the same screen, figuring out how to do it, probably involves some "trouble shooting" which is difficult if you don't have the appropriate skillset (and tools!).
I'm sure I have the tools, it shouldn't take more than a mulitmeter and some patience right? If we're talking oscilloscope and the like, then I'll probably go a different route.
Now this would probably be outside my skillset but one of the main reasons for doing these types of projects is to learn new skills!
So, any advice on how to do that would be greatly appreciated but if it's too complicated to explain then I understand completely!
Again, thank you so much for the replies and I hope you have a fantastic New Year.
