I have a cosplay project where I'm creating a "Megaman" aka Rockman type of arm cannon (it's actually based on DC's Cyborg). Anyhoo, I've been weighing options like using 3xAA alks or 4xAA nicd (or otherwise 1.2V)--inclcuding various combinations of less or more cells with a voltage regulator; boost up or step down as appropriate.
there are 4 lighted segments (15 leds of WS2812B x 4). I also of course have to power the Arduino Nano as well. I'm flexible on led brightness so I'm just going to tune it [code it] to whatever looks adequate for my purpose. I am aware of the 50ma draw of these units at full brightness
My original plan was to just keep it easy (read lazy) and use 3 AA alks per 2 segments, and another 3 so the nano can have it's own supply. So 9 cells in total (without any additional regulation). Before you judge me--weight, volume, and especially area are definitely big factors in my decision.
So that's a long way to get to my actual question. Has anyone used these new types of USB rechargeable batteries? They seem to have the best of both worlds with the power of an alkaline but the consistency and sustainability of a NiMH /NiCD as they have internal regulators that produce a steady 1.5v (until they don't--which I'm more than cool with)
Short of having a properly regulated 5v power supply, are these a good option if I want to be slightly more responsible than throwing in whatever other AAs I have lying around? They definitely check the box on my space/mass requirements. I'm sure they do fine with most consumer electronics, but as far as arduino and any other custom/hobby 4.5-5v applications how reliable are these? Even if you haven't used them before I'd be curious of your thoughts. I'm a novice at best when it comes to elec engineering.
Yes, they are expensive. Thanks all!