How long do you think a 20,000MaH battery could power this?
1964036
If you mean a battery with a 20,000 mAh capacity and a fan with a .400 A continuous current drain, then the battery could power the fan for 20,000 mAh/400 mA = 50 Hrs
1964037
The Formula to calculate the battery life is Battery Capacity (mAH)/Load (mA). Here, maximum drain is 4mA, so 20,000mAh/4mA = 50 hours.
478377
power draw is 4 amps @ 12 volts. So if you have an 80 amp-hr battery you'll get 20 hours.
150903
Actually less than 10 hours, but you can charge the battery at home and use it later. But you are correct more or less 8 hours
1354133
I do not know, but I do not believe this battery can sustain that power output for more than a couple of seconds, if at all.
1907407
The battery should last several years I am hoping. The charge on the battery is more like 5-7 hours depending on what you are running.
599564
for the 18,000mAh it takes almost 24 hours (from empty to full). When I know I'm going for a trip, I plug it at 8PM (at this time, the battery is EMPTY totally)and it's usually finishes at around 8 AM (almost, sometimes half an hour more is needed)
1440600
We've not run it for extended periods to the point of draining the battery, however we've at least run for 3-4hoirs w/out issue. I think you could get 4+ but would be pushing it. Also depends on the volume too. Higher will require more juice I suspect. That said, I think 3-4hrs straight ia a realistic expectation before having to put a recharge on it.
701846
I don't think it's possible to give an exact answers, as there are several variables. A large trolling motor battery will hold a charge the longest amount of time.
637339
Sorry it took me so long to answer the question. I had planned to measure the charging wattage but have been too busy. There is nothing on the battery that states the current required for charging. So I'll estimate that it would be 10 to 20 watts maximum. Insignificant.
1678305
Hi Anne----I don't know how long it lasts;but I do know it's a lot longer than the 18V (no longer available) that I used previously...the battery is still strong after a few weed whacking jobs---I also have this battery in a WORX hedge trimmer---it's got a lot of hours on it!!!! I also bought the quick charger for my 20V batteries.... I'm impressed by how long these last.... Janet
1209301
I don't think it's more than a couple of hours, from a drained battery. But I'm not 100% sure. Definitely not an all day thing though.
532348
I'm sorry I don't know the one I got does not hold a charge more than 20 minutes
641418
My best calculation says about one hour on a fully charged 160 AH battery. That would reduce the battery to half charge, and you don't want to go lower.
249318
I charge mine for 16 to 20 hours and I also bought a second one to use in the mean time.
2261472
It would be safe to say 8 hours, but it lasts a long time. There is no worry in the battery department!
47610
the battery comes with the device is supposed to last 20 hours when the devic is on. there is another type that will last for 100 hours.
2258276
Probably not a good idea. I bet the 20 minutes is not only for safety, but also because this thing probably only has a 20 minute duty cycle. You'll probably burn it up