I Recently Bought Ultrafire Lithium-Ion Batteries: A Review of Their Performance

I recently purchased six ultrafire lithium-ion batteries, which I was excited to test and review. These batteries are often touted as being twice as capable as traditional brands like Samsung Phillips or Sanyo, and at a fraction of the cost. However, I have to say that my experience with these batteries has been quite different from what I expected.

Upon inspection, the protective packaging of these batteries revealed that there is indeed a protective circuit inside, designed to prevent over-discharge when the voltage falls below 2.5 volts. This sounds like a great safety feature, but I wanted to see if it would hold up in real-world testing.

To start, I checked the voltage of all six batteries and found that most of them were within normal parameters. However, one special battery had a voltage reading that was significantly lower than the others - only 2 volts! This raised some red flags, but I wanted to see if this battery would still behave normally when charged.

To charge the batteries, I used my bench power supply and limited the current to 500 milliamps. It took quite a while for them to fully charge, but eventually, the voltage stabilized at around 2.5 volts. At this point, I decided it was time to put some load on the batteries to see how they would perform.

I started with a high-power LED and monitored the voltage using my multimeter. The current draw was quite small, so I switched to an older-style pole that drew significantly more power. This had the desired effect - the voltage dropped to 2.5 volts, which is when the protective circuit should supposedly kick in. However, nothing happened.

It seemed like these batteries were just going to ignore the safety feature and continue functioning normally. I decided to push it further by soldering a wire to the positive terminal of one of the batteries and roughening up the negative terminal with some sandpaper. This was supposed to simulate an open circuit and trigger the protective mechanism, but again, nothing happened.

At this point, I realized that these batteries didn't have a protective circuit after all - or at least, it wasn't doing its job as intended. So, what's going on here? Are these batteries just not designed with safety in mind?

To find out, I decided to take things to the next level and use two 12-volt moped batteries to charge the ultrafire cells. This was supposed to give me enough power to damage them if they weren't safe. When I connected the plus and minus terminals of the battery and dropped it into a plastic pipe, something unexpected happened - nothing explosive or catastrophic occurred.

Instead, after 20 minutes, the voltage in the battery stabilized at around 7 amps, which was much higher than expected. This suggests that these batteries have an internal short circuit somewhere along the line, allowing them to bypass their safety features altogether.

It's worth noting that I didn't get a small explosion or any other dramatic results - just a slow increase in current draw until it reached a steady state of around 7 amps. This wasn't as bad as I had feared, but it still highlights a major concern with these batteries.

In conclusion, my experience with ultrafire lithium-ion batteries has been quite unusual. While they may seem like a great bargain, their performance falls short when it comes to safety features and internal design. If you're considering purchasing one of these batteries, I would caution you against doing so - just because the packaging says there's a protective circuit doesn't mean it will work as advertised.

At the same time, if you still want to buy ultrafire lithium-ion batteries for some reason, make sure you take precautions when working with them. A short circuit could be hazardous and potentially cause serious injury or damage.

WEBVTTKind: captionsLanguage: enI recently bought myself these six ultrafire lithium-ion batteries with a capacity of 4800 milliamp hours and that is awesome right I mean they have twice the capacity than big brands like Samsung Phillips or sanyo with their models and they are even cheaper well it is actually too good to be true just look at the side where I got them I mean working time as always four hours are you kidding me so an LED will light up four hours with the little current it needs but a bigger motor which needs way more current also will live for four hours you know what I call so in this video let's not find out the true capacitance of those batteries yet but let's have some fun with a bit of extreme discharging overcharging and short-circuit experiments first of all let's inspect the protective packaging of those turrets and as you can see it tells us that there's a protective circuit inside which prevents it from over discharge when its voltage falls under 2.5 volts overcharge and short circuits now that would spoil the fun but first of all let's check the voltage of all those six batteries and most of them have actually a pretty good voltage no complaints there but just as I thought there was a special one with a voltage of under two volts which is not good just to make sure that there really wasn't a protective circuit I started to solder a wire to the plus terminal and I used sanding paper to rough up the negative terminal so I could solder another wire there then I got my bench power supply and limited the voltage to 4.2 volts and the constant current to 500 milliamps because I do not know the real capacitance so let's charge it up slowly it took quite a while and the current draw dropped slowly over time when it was somewhere underneath 100 I decided to stop charging and put a load on the battery at first I used this high power LED and monitored the voltage with my multimeter but that was quite a small load so I got this old fashioned pole which drew way more currents and speeded up the process okay now we are 2.5 volts and it should turn off now or now or now well I call this thing has no protective circuits and where should it hide I stripped off the plastic around the cell and there is nothing in conclusion there is no circuit so we can have some fun with more dangerous experiments for the overcharge test I got myself this 12-volt moped battery and charge it up again so it would have enough power to damage these things I also chopped up the unprotected battery because this will be the victim for the short circuit experiment I also use these long acrylic pipes and hot glued a piece of cardboards in the top so that the batteries can sit there later ok now let's move this outside because this can be dangerous and let me tell you that you should not do this let's start with the overcharge we place a 12 volt battery on the ground and check the voltage again we used the screw terminals to secure the exposed wires to the battery and cut the amp meter in place with the flick of a switch the three point seven volt batteries started charging with a 12 volt source and it was boring like really nothing happens the amp draw settle around 1m and we waited and waited and nothing happens that's a plus point for the battery I guess now let's try the short circuit I used some silver copper wire to connect the plus and minus terminal and immediately drop the battery into the acrylic pipe and guess what happened after 20 minutes nothing well it got pretty hot but nothing more happens another plus for the battery but we got an extra and now a short circuit but this time we could measure the amps and at first they went down to around 7 amps only to rise up to around 9 amps afterwards and we even got a small explosion at the end they even ripped off the plastic protection what can I say at the end these things may not have a protective circuits but they are not as dangerous as I thought I would be and that doesn't mean that you should try this let's end this experiment here and if you liked this video then don't forget to like maybe also subscribe to get more videos like this stay creative and I will see you next timeI recently bought myself these six ultrafire lithium-ion batteries with a capacity of 4800 milliamp hours and that is awesome right I mean they have twice the capacity than big brands like Samsung Phillips or sanyo with their models and they are even cheaper well it is actually too good to be true just look at the side where I got them I mean working time as always four hours are you kidding me so an LED will light up four hours with the little current it needs but a bigger motor which needs way more current also will live for four hours you know what I call so in this video let's not find out the true capacitance of those batteries yet but let's have some fun with a bit of extreme discharging overcharging and short-circuit experiments first of all let's inspect the protective packaging of those turrets and as you can see it tells us that there's a protective circuit inside which prevents it from over discharge when its voltage falls under 2.5 volts overcharge and short circuits now that would spoil the fun but first of all let's check the voltage of all those six batteries and most of them have actually a pretty good voltage no complaints there but just as I thought there was a special one with a voltage of under two volts which is not good just to make sure that there really wasn't a protective circuit I started to solder a wire to the plus terminal and I used sanding paper to rough up the negative terminal so I could solder another wire there then I got my bench power supply and limited the voltage to 4.2 volts and the constant current to 500 milliamps because I do not know the real capacitance so let's charge it up slowly it took quite a while and the current draw dropped slowly over time when it was somewhere underneath 100 I decided to stop charging and put a load on the battery at first I used this high power LED and monitored the voltage with my multimeter but that was quite a small load so I got this old fashioned pole which drew way more currents and speeded up the process okay now we are 2.5 volts and it should turn off now or now or now well I call this thing has no protective circuits and where should it hide I stripped off the plastic around the cell and there is nothing in conclusion there is no circuit so we can have some fun with more dangerous experiments for the overcharge test I got myself this 12-volt moped battery and charge it up again so it would have enough power to damage these things I also chopped up the unprotected battery because this will be the victim for the short circuit experiment I also use these long acrylic pipes and hot glued a piece of cardboards in the top so that the batteries can sit there later ok now let's move this outside because this can be dangerous and let me tell you that you should not do this let's start with the overcharge we place a 12 volt battery on the ground and check the voltage again we used the screw terminals to secure the exposed wires to the battery and cut the amp meter in place with the flick of a switch the three point seven volt batteries started charging with a 12 volt source and it was boring like really nothing happens the amp draw settle around 1m and we waited and waited and nothing happens that's a plus point for the battery I guess now let's try the short circuit I used some silver copper wire to connect the plus and minus terminal and immediately drop the battery into the acrylic pipe and guess what happened after 20 minutes nothing well it got pretty hot but nothing more happens another plus for the battery but we got an extra and now a short circuit but this time we could measure the amps and at first they went down to around 7 amps only to rise up to around 9 amps afterwards and we even got a small explosion at the end they even ripped off the plastic protection what can I say at the end these things may not have a protective circuits but they are not as dangerous as I thought I would be and that doesn't mean that you should try this let's end this experiment here and if you liked this video then don't forget to like maybe also subscribe to get more videos like this stay creative and I will see you next time