when I charge my 10000 mAh battery to 100% after about 20mins. it drops to 90%, yet , it took several hours to drop from 5% to 0. why?
574307
'cause when the phone says 100% the battery is not actually there. the phone only interprets the voltage it senses but the capacity of battery is not full yet. I recommend to only charge the phone with at least 2A charger. suppose you have a 0.7 Ah charger (700mA) (it reads on the charger btw) then 10000mA divided by 700 means 14 hours of charge required! this is why you should always charge with 2A charger, that way over night (cca 6h) your phone will be fully charged.
1529212
My charger showed full charge after less than 2 hours. However, the charge doesn't last as long as the original battery number 855.
1011371
if you can smell the battery it probably is bad or your overcharging it.. How long you should charge your battery is totally dependant upon how many milliamps or mA it has. If it has 1400mA it will charge much faster than a battery with 2800mA. Now look at your converter, you will notice several things on the sticker that will be affixed to it. We are looking for the output rating on it specifically. It usually says something like "OUTPUT: DC 8.4v 300mA" but changes from brand to brand and model to model. See that 300mA on the charge? That's how many mA its charges per hour so if you have a 1500mA battery and a 300mA charger its just simple math from this point.So it will take 5 hours total to charge a completely dead/new battery to its full capacity. You simply divide the mA on the charge to the mA of your battery and you will get the time it should take to fully charge a completely drained battery. This does mean to set it and forget it though. In most cases your battery has already been charged once even if still new for quality control purposes so you really need to keep an eye on your battery still.
1087186
Perhaps mine is defective, but a fully charged battery discharges to 0% within a week or two.
805868
My new battery was already charged and I used it right away. Then when I loose a bar I charge it about 20 min. when the battery light stops flashing which indicates the battery is fully charged.
1142704
I've left mine charging for several days, and have never had performance issues with the battery. I know that's purely anecdotal, but its not something I've ever had an issue with.
287524
Last night, I noticed it got stuck at 90% while charging. I simply disconnected it, and reconnected, and it hit full capacity within 5 min's.
612592
My battery began losing charge after 9 mo. It is now exactly 1 year since I purchased it and it runs for 20 minutes. I did the reset thing but same result.
1226866
I have run my boat battery down several times and within 4 hours it is completely charged. This would of course on the life of your battery.
166683
My large car battery was at 78% and it only took 1 and half hours for me. And it has been very good at keeping it charged.Definitely buy it. Joe M.
204270
I got a similar unit and when I first plugged it in, it too showed "fully charged". I then unplugged it and checked the battery level, but it instantly showed 0V. So that told me the "full charge" reading was false and the charger was giving me that reading while the battery seemed like an "open circuit" and was not accepting power yet. So I did leave it plugged in and within 1/2 hour it began dropping the reading to show 65% charged or such which I knew was more realistic. So despite getting that "full charge" reading off the bat, it does need the charge time.
2189388
The first time I charged my battery it went from purple when charging to blue when it was 100%. The second time (which is as we speak) the battery was 26% when I plugged it in and the light is red. Not sure what red means since the first time charging was purple. I did the power cycle on it and its still red. Maybe it will turn purple then blue? It took about 6 hours to charge from 20%-100% the first time.
1414342
If the Leaf computer estimates a low range such as 15km remaining then it takes about 4 to 5 hours to bring it back to 100% charge. We charge at night when the electricity is cheaper. We often charge to 80% since this will extend the life of the battery.Good luck and consider the AeroVironment EV charger for purchase...it is a very good unit!CheersBill
1278430
I will recharge my light when I notice a distinct drop in the brightness while in the high mode. Timeframe will vary based on usage. Charging before seeing a drop in performance will actually shorten performance as time passes due to battery developing a memory and full charges not lasting as long. Hope this helps.
2259697
My Schumacher charger would let the battery drop to less than 50% without restarting. I believe there is a fault with the unit's processor. Schumacher support would not respond to my requests for a remedy. The remedy is to return it before the money back guarantee expires.
1580574
I've plugged in another brands battery pack like this and when I plugged it in, it instantly showed "fully charged" on it's indicators. However, I wasn't sure so pulled the plug on the charger and checked the battery voltage which was under 6V (showing that it was far from fully charged). So I plugged it back in for the 12+ hours and for the first hour, it stayed showing full (because the battery was resisting the charge power and the charger gave the lights the "full" 14V false reading), but as the battery began accepting the charge it dropped to 60% and then climbed back up over time. So don't be fooled by it showing that "full" within a few minutes, leave it plugged in for at least 12 hours (and by then it should be accepting the charge and the readings should have dropped, so once it raises again you can believe it's really "full".
2105965
I've never had it take more than 3 hours from completely empty, but it depends on what you're charging it with. As for how long it holds the charge, mine has held a charge for a couple weeks and any loss in capacity was not apparent to me. It may hold it longer than that, but I have used it so frequently that it has never been left alone longer than that. Make sure you charge it fully before first use, the longer the better for that. I believe the other answer was either a defective product or not fully charged the first time, because of how fast they lose the charge and how short their charging time is.