2 x Ultrafire® 18650 Protected Lot de 2 piles rechargeables 3.7V 3000 mAh Batteries
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- Ultrafire 18650 3.7V 3000mAh Rechargeable Battery
- Rechargeable Time up to 500 times
- Dimensions : 65mm x 18mm
- Cell Type : Li-ion, Cell Size : 18650
- Battery Capacity :3.7V 3000mAh
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Integrated battery overcharge
discharge protection circuits. High discharge performance Li-ion Rechargeable Battery.
More than 500 charge-discharge cycles.
Note:On first charge, it gives less nominal 3000 mAh. It will take almost 10 cycles of charging, discharging for reaching maximum capacity would may be up to 3000 mAh.
Mark Capacity 3000mAh
Actual Capacity 2400mAh
Max Continuous Discharge: 10A
Application：Particularly suitable for flashlight, electric tools, electric bicycles, electric vehicles. torch, digital camera and other digital products.
Standard voltage is 3.7V, the voltage of full charge & empty condition is 4.2v & 2.5v respectively
Package:2 x 18650 battery
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Top Customer Reviews
I was surprised at how light they felt so I weighed them. They were 33gms whereas some older 18650 batteries I have are 46.5 gms.
With some NiMh batteries I find it is common for sellers to claim a high capacity where the batteries are actually of low capacity - and have a correspondingly low weight compared with good ones.
Does the same principle apply to Li-ion batteries?
To find out I made a test circuit (discharging though an ammeter and a 2.5 Ohm resistor) to measure capacity. As a control, I also tested one of my old 3860 batteries ("Asucell" and labelled as 3000 mAh and I measured the output at 2853 mAh - quite good for a well used 18 month old battery I'd have thought.
I then tested both of these Fire batteries and the capacity is showing up as just over 800 mAh - so less than 30% of that claimed.
I gather that one of the operations of the protection circuits in Lithium ion batteries is to prevent damage caused by discharging below 5% of capacity. I noticed that the old batteries I have cut out when voltage got too low - presumably the circuit is working, whereas these "UltraFire" batteries did not cut out so I wonder if they have any protection circuits at all.
Lithium ion batteries can be dangerous. As the 3000 mAh label is a lie, don't trust the "protected" label.
Contacted the company, they gave me a full refund on return of the items.
The rest don't charge properly.
Too good to be true.
The one that I took to pieces was full of what looked like proper cell material, no chalk packing, but what was supposed to be the safety over charging / discharging device inside the cap did not a look genuine piece of kit. Dont try this indoors or if you dont know what you are doing because even a battery that appears dead flat can still have a considerable charge if the internal safety device has operated or failed, which means that dismantling could cause fire, injury or contamination. Measuring the amp hours of lion cells cannot be done reliably by discharging with a lamp or similar load whilst measuring time and current because it will discharge below the threashold voltage of about 3 volts and the cell will be damaged or un recoverable.
Most Recent Customer Reviews
I have been using these for a while now in various torches either solo or as a pair. Good reliable batteries.Published 11 days ago by Mr. C. Clarke-williams