DIY Safe Shutdown w/ PowerBoost Here is a little circuit which provides safe shutdown capability when using a powerboost from Adafruit. Parts required: 1 x momentary switch 1 x 220uf capacitor rated 6v minimum 3 x 10k resistor 1 x 33k resistor 2 x 100k resistor 4 x Small signal diode (1N4148, 1N914...

What's the existing circuit? If it has the led, switch, etc. I'd just wire up the power bank to that. Got a pic of the innards?

Probably the cheapest option would be to use the guts of a powerbank.

Yes, load on the battery is whatever you connect which draws power. It's possible to charge multiple batteries safely if it's done correctly. Adafruit has a good article on it.
https://learn.adafruit.com/multi-cell-l ... g/overview

IMG_20180323_084544964-01.jpeg NES Zero Parts list: 1x Original NES Controller (NES-004) 1x Raspberry Pi Zero W 1x 1.44" 128x128 SPI TFT Screen (ST7735 Driver Chip) 1x Adafruit PowerBoost 500C 1x CJMCU Micro USB Breakout Board 1x 4mm deep, 30mm wide, 40mm long, Lithium Ion Battery (043040) 3x Momen...

Here are the things I changed to get the screen and buttons working. /etc/modprobe.d/fbtft.conf # /etc/modprobe.d/fbtft.conf options fbtft_device name=adafruit18_green gpios=reset:27,dc:25,cs:8,led:24 speed=40000000 bgr=1 fps=60 custom=1 height=128 width=128 rotate=180 /boot/config.txt # For more op...

That's awesome! Takes me back to primary school. I think shipping to Germany is expensive regardless. As I recall it is somewhere around $20 american for something that size... What is ebay quoting you for shipping?

Ha, that's awesome! I suppose you lose the ability to plug in things via USB and also maybe the HDMI, but in my case that's fine. I still want to add a low battery signal though so that in the worst case I don't drain the battery to the point of no return. I plan on adding a mosfet board to allow fo...

Thanks moosepr. Was pulling my hair out there for a while with the dang garbage pixels. I was looking online for a small battery to fin in this guy and I remembered seeing a tiny powerbank, if you can even call it that, at a local store for $4. I bought one in hopes it would work. Upon opening it, t...

So after posting yesterday, I unplugged this guy and upon plugging it back in the garbage pixels on the screen had come back. It turns out that you can rotate the screen (through fbtft.conf and config.txt in combination) and remove them but upon resetting power to the screen the issue returns. I the...