how fast will it charge a 4000mah 2s?
1344130
This charger can only supply about 800mAh so if you take 4000/800 you get 5 hrs! Usually with 2 cells that math is that simple, it gets a little more complex with 3 & 4 cell but still a good approximation. I suggest at least a 4 Amp charger for larger batteries like a 4000mAh LiPo packs, here is one sold here on Amazon BASTENS easy to use fast LiPo battery balance charger 4Amp 1 2 3 4 cell batteries connectors included for 3DR Iris+ Aero Parrot AR Drone DJI Phantom XT60 Traxxas Losi EC3 Deans mini & standard Tamiya
1344131
Depends how much drained. I charge my half drained 4s 5000mah in 2hrs. Hope this helps. I really like mine especially the safety feature that after fully charged it will not over charge your battery. This is huge for me. I sometimes tend to forget that I am charging my battery. Hope this helps to answer your question. Thanks. Dan
439498
The stock oem charger output is 2amps. therefore means that is giving 2000milliamps in 1hr. So take 7500/2000 = 3.75 hrs from fully drained to a full recharge.
1141973
The s2 has a charging circuit that will regulate the current to the amount it needs. It would only charge faster in the 2.4 amp port if it needs more than 1 amp. The internal s2 charging circuit will keep it from overheating in either port.
248773
It depends on what you are charging..it will fully charge a 2150 mah in about 90 minutes. Hope that helps.
839773
I haven't gotten a chance to use it yet but figure it this way ... If you have a newish Samsung device or IDevice and it charges it should be at least 1 amp. If it fully charges a device like the Samsung 4 its probably 2 amps. I was slightly peeved when I got this and it didn't have the normal conversion sticker like other solar usb devices. We both have to hope we didn't buy an 8800 maH battery that doesn't charge anything in the 21st century.
874103
NO! if you hoped for the Fast Charger!!YES! if you want to normal slow chargeI bought this, for my Samsung Galaxy Note 4, like Andres Davila says that he meant NO. Yes, it will slow charge at 5v with 2 amps maximum... This is NOT the quick or Rapid charger that comes with the NOTE 4... That "OEM" charger has BOTH 9.0v and 1.67 amps, and will also charge at 5v 2.0 amps. this charger is fine for all day charging a note 4
1156839
Yes, But will not charge at 1C rate. Max charge rate when using all four slots is 1000ma. Max when using two slots is 1200ma. i.e. around two hours charge time. Normally charger must put in about 110% of discharge current if battery is in good condition. Really like this charger because each slot is independent and retains values after both charge and discharge.
1078512
The 2 Amp output should be sufficient for charging any type of small electronics. My iPad 2 charges in about an hour.
1403769
Yes it will do it. However I don't if the one I received is defected, I m not satisfied of the overall performance. It does not show a complete 100 percent charge nor its output of 20000 mah is reliable.
153648
Hi Lawrence, In a wall charger it takes about an hour, mAH is 4900. Just be aware this is a large battery and adds a bit of bulk to my Sony Handycam.
1270026
Depends on whether you buy a reputable brand battery with accurate current rating at this drain rate. Most 4000mAH cells are not rated correctly and will be a disappointment.
105660
This one is has a 2000mAh battery ....not a 4000mAh battery. For reference, a rechargeable "AA" battery is 2500mAh. mAh is milli-amps per hour. This unit has an attached micro B power cord but also has a USB port to plug your power cord into. Here's another unit to consider http://www.amazon.com/gp/product/B00JM59JPG/ref=olp_product_details?ie=UTF8&me= this one has 2 USB ports and is 10000mAh but is fairly thick. Both power packs are capable of running 2 devices at once.
468102
That depends somewhat on the charger. I have a very compact Energizer charger (#CHDC8) that will charge 4 AA's in about two hours. Some quick chargers are faster, but I've been told fast charging is not good for the batteries.
346843
It depends on your charger. I did not pay close attention but I used a 1 amp charger and it took about 2 hours or so.
1462691
Not familiar with that charger, if it charges 2s and has balancing plug you should be fine
813019
Don't think I'm a good one to ask as it has NEVER charged faster for me than a regular charger. I gave a review saying this and it was denied publication.
2067104
There is a good chance that the current output is not high enough to charge the battery really fast. Additionally, it is better for the battery's longevity to charge it slower. I would have to take out my multimeter to check into it, but my guess is that its good for over night charges and not super fast charges. What I recommend is purchasing a second battery and keep one charged up so you don't have down time. I personally have an S2 and when at conferences, typically pull out that second battery.