Why is the Anker's 12-cell/10400mAh rated at 4+ hours, but my 9-cell/7860mAh is rated at 7+ hours?
1071455
My Anker gives me a solid 4 hours of almost fully bright screen and optical drive use. If your 9-cell/7860mAh is rated at 7 hours and performs that well under load it's a great battery. If it doesn't perform that well under load than it could be a "difference" in test conditions. (My Anker will keep my Pavilion dv7 going all day with a dimmer screen and no real use)
1071456
Probably the size of the battery is the answer. Compare to automobile battery. A size 24 has a different capacity from a size 78.
1071457
Couldn't say. I know the Anker lasts all day of steady use. I just charge it at night and it's good. The other brand I tried would go half that long.
695980
It doesn't, IMO the cells are bogus I could not find any official data on them and the folks at candle power forums seem to agree. If you were to assume 100% charging efficiency the charger would supply 300mA per cell. If you divided that buy 4000mAh you get ~14h more due to charging losses. If you have these cells & they charge in 3h from an empty state there is something wrong with the cells. Even a 2000mAh cell would take ~7h to charge at 300mA
167415
I bought both a 6 and 9 cell in May 2012 and depending on the duration needed I alternate. The 9 cell always gives me at least way over 2.5 hours for note taking. Seems to be the same now as when I bought it.
2281077
I'm also disappointed, now it's up to 69.99! It use to a bargain compared to Anker. Not sure about that anymore... It must be demand like everything else. Did you find an alternative?
1292899
Hmm good question. I'll have to pay attention today. I know it said around 7hrs so my son just charges it at nighttime mostly.
1340686
My Anker Slim 3 was defective and only worked intermittently so I can not say how long it takes. I returned it.
311976
Don't know about the Anker - but I absolutely love the 11200mAh! Bought one for each of my daughters and son-in-laws as stocking stuffers. Fits in my purse/briefcase easily too. Great for meeting or while I am flying.
2196412
This is a slow charger. You are not going to see any "one hour super charge" features on this thing.I recommend "overnight", though to answer your question I've seen up to 12 hours for a fully depleted high-capacity NiMH. Old, worn, or damaged batteries may have strange charge times (very short/very long) as well.
300225
But who is the manufacturer of this 9 cell battery? I have found that many other foreign manufacturers have substandard batteries that do not last and lose their charging capability quickly...hopefully this won't be the case but make sure there is a lengthy warranty for that battery
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.
2061138
I don't know what these guys are talking about it only lasting 8 or 12 hours between charges. What are they doing with it? I work on my computer 8 hours a day and have to recharge the battery every few months or so. What am I missing?
386158
you need to give the AH rating of your 12v battery to determine charge time.
1426625
Cells I can't tell you but it only lasted 2 hours at max. I'm in the process of exchanging mine.
522873
It says 3 hour charger, meaning could fully charge in 3 hours. Not run time.
1406451
I believe the warranty is for 1 year. I had this battery for a week and it only lasted about an hour. I notified Anker of the problem and asked for a refund. They emailed me a return label to send the battery back. I just put it in the mail yesterday so I haven't received the refund yet. I would recommend you contact Anker to let them know of the problem.
606065
The manual says it is a "smart" design, but it also says it takes 14 hours to charge 8 AA cells. It's unlikely the 9V circuit is zdv design, but at 12 hours charge it doesn't matter because the 9V will not be hurt by a C/10 charge rate.
1020929
The description on the back of my battery rates it as 7.4V 2200mAh. Li-On isn't mentioned -- assume it stands for lithium ion, which these are. Work great in my Core micr+wire gloves, now going on four years! Got new batteries a few months ago. Caveat: I can't get more than 2 hours out of batts without recharging, and usually a little less. I keep a second pair charged for longer periods. And, recharging fully usually takes about 4+ hours. Still the best thing I've found for my colder-than-normal hands during Colorado foothill and mountain days below about 30F. The gloves are even better fitting, more flexible, and sleeker than most outdoor activity gloves. The description on the back of my battery rates it as 7.4V 2200mAh. Li-On isn't mentioned -- assume it stands for lithium ion, which these are. Work great in my Core micr+wire gloves, now going on four years! Got new batteries a few months ago. Caveat: I can't get more than 2 hours out of batts without recharging, and usually a little less. I keep a second pair charged for longer periods. And, recharging fully usually takes about 4+ hours. Still the best thing I've found for my colder-than-normal hands during Colorado foothill and mountain days below about 30F. The gloves are even better... » Read More The description on the back of my battery rates it as 7.4V 2200mAh. Li-On isn't mentioned -- assume it stands for lithium ion, which these are. Work great in my Core micr+wire gloves, now going on four years! Got new batteries a few months ago. Caveat: I can't get more than 2 hours out of batts without recharging, and usually a little less. I keep a second pair charged for longer periods. And, recharging fully usually takes about 4+ hours. Still the best thing I've found for my colder-than-normal hands during Colorado foothill and mountain days below about 30F. The gloves are even better fitting, more flexible, and sleeker than most outdoor activity gloves. « Show Less