3 ms·
I have an emergency radio / USB-C battery combo thing with like 5000mah and the math on the hand crank says I'd have to crank it continuously for like 48 hours
by keep_reading 3y ago
I have an emergency radio / USB-C battery combo thing with like 5000mah and the math on the hand crank says I'd have to crank it continuously for like 48 hours to charge it. It's completely useless. I'd die from exertion just trying to charge it if I was stranded.
- kmeisthax 3y agoYou don't need to crank the whole 5000mAh, you just need to crank enough for your phone to get a phone call or two out, and that's assuming the battery wasn't already charged prior.
- mynameisvlad 3y agoI mean, sure, the person you replied to wouldn’t but if this was your primary method of charging your device, as the original comment suggested, then you would need to crank the whole 5000mAh. Multiple times, since I assume you’ll want your phone charged more than twice.
- imtringued 3y agoIf a phone call or two was enough to end homelessness then it would have ended a long time ago.
- Kirby64 3y ago5000mAh battery at 3.7V nominal has roughly 18-20Wh of juice. Your crank would only be putting out 400mW of power if it truly took 48 hours to charge. Internet seems to think most hand cranks can output somewhere between 5-15W, which would mean you'd only take 1.3-4 hours to fully charge said pack. Plenty of juice in an emergency situation, and certainly plenty for a phone call or something. Maybe that's a big giant crank thing though, and the tiny plastic crap ones only put out the wattage you're talking about though.
- keep_reading 3y agoIt's a tiny plastic crap one :)