Go to Target, Bed Bath And Beyond or ChinaMart and buy the O2 Cool 10” fan which either runs on 12vdc, or 9vdc. They use 8xD (older model) and now 6xD (newer model), which also comes with a 120vac wall wart adapter.
With a homemade barrel adapter, you can run them off of a bigger 12v AGM/SLA battery. I’ve got one of each and they are quite portable with the alkaleaks installed and they offer ~40 hours on the high setting.
They saved my bacon durning IRMA and 84 hours without power.
It can run off 4 AA cells, or USB power. I use Eneloops, and it lasts a few hours on them. I really like it, and the quality seems good. It’s powerful. My only complaint is that it is a bit noisy, but I guess all small fans are like that. Okay, my only other complaint is that it only has 1 speed.
An identical fan in the OP is on lightning deal right now (Sunday, June 3, 2018) on Amazon US until about 6:30pm EST. COMLIFE USB Desk Fan, 4400mAh Rechargeable Battery Operated Portable Personal Fan. 9 inch $29.74, 7.5 inch $21.24.
I bought a couple smaller single 18650 fans from Caseys early last year for camping. They were cheap, worked great until I tried to run it while charging, burnt both of them up.
My wife likes to have a louder fan, I don’t mind the white noise now, took me long time to get use to it, now I have trouble sleeping when its to quite.
I also like a fan during the evenings to help keep bugs away (sometimes helps). Or keeping the smoke away.
I currently use a comfort zone usb power fan, on my dresser next to my bed, just barely enough airflow. It rotates , I cant find a link to it, got it last year, Menards i think
I ordered 9” sunday, it just arrived, put some 13q’s in while the batts it came with are charging. Nice and quiet and high speed puts out a good bit of wind!
Hi Chris, I’m doing a nor test right now. Both cells were around 4 volts. In the meantime, I’m using Samsung Q30’s. My initial opinion of this fan is positive. The low mode is very quiet and is more than enough CFM’s for my needs. Build quality is very good. I think it’s a steal at $21.24.
I’m looking at them now, although as I suggested above, I went the 02 Cool 10” 8/6xD (12vdc input) fans for my hurricane preps, which came in handy during hurricane Irma last September.
Any quality HiCap 18650 would probably be better, even naked cells are fine in your fan and you should be able to extend the duty cycle by 50% using something like NCR-GA Pannies, or even the cheaper NCR-Bs. I’m sure that it’s not pulling more than 500mA on high, so it’s not a strain on the cells.
I would run the good cells down and charge them back up with the internal charging module and then measure the cells when you see that they’re full, just to confirm what the charger is doing. If it’s within spec, then you know and if it’s dwanky, just charge outside the fan.
Chris, I’ve decided not to use the original cells. I have plenty of Samsung Q30’s, so I’ll be using those. It’s better to be safe than sorry. I’ll be using this fan on an Anker USB Power Supply most of the time. The batteries will come on handy when I’m not around house power such as camping, etc.