Powerful battery. Fast charge capable and good performance in the model

The Jamara Tiger from my son unfortunately ran with the original battery (1800 mAh) only 10 min. And therefore needed a second battery. LiPos are too expensive and too sensitive, so it should continue to be a NiMH battery. First I bought a 4500 mAh battery by XCell who actually had a lot of good reviews. Either we caught a Monday copy, the specified capacity is simply not true, or the battery is faulty. The battery has persevered just 15 minutes and went back immediately. My digital charger has shut down each time at about 8.5 V, whether loaded with 500 mA or 4.5A. More simply was not there and I suspect that a cell was broken.

That's why I bought the Kraftmax, although he at that time had no reviews. The first shop on good 9 hours with 500mA the cut-off voltage was reached at 9.18 volts and thus a good value was achieved, which is appropriate for a 6-cell battery. Here, the battery was barely lukewarm. In road tests with the tiger, he has persevered under different load conditions 35 Minutes, what good is threefold compared to the original. Accordingly, the capacity of 5000 mAh statement seems to be true.

At the second store with 4500 mA battery had to show whether he is good at something fast charging. After 1 hr. And 10 min., The charger has switched off at 9.20 V, but the battery was significantly warmer. But this is not unusual and in my experience, everything's alright. In the subsequent test drives, he then held out a good 30 minutes again, and so that all expectations were met. I am very happy with the battery and therefore have pulled myself again and a written evaluation.

I can not comment, but I hope that there is no disappointment here about the longevity. Otherwise I will complement this.

Edit 03/25/2014:

After the battery has now seen a number of charge cycles and has not diminished appreciably, the Junior bekommmt yet another battery.

What I would like to mention is that you should use a halfway decent charger. So at least once with adjustable charging voltage, adjustable charging current and shutdown. For about 50 Euros you get an IMAX B6 (Only Original Attention, there are also several fakes in circulation!), Which is for a beginner really okay and a reasonable price / performance ratio offers.

The power supply units (I will not call it a charger), which are included with most models, are absolute crap. With a charging current of 350-500 mA you need to load it 10-14 hours for such a battery. If you forget to disconnect the battery from the calculated time, then load the things on forever and like the battery is not really. Apart from that it took forever and the puny charging current, it is also not easy to make the point at which the battery is actually fully charged. Any settings and monitoring functions are absent in these things also and who wants longer take pleasure in his battery, which should also invest a few euros in a charger.

Update 04/04/2014:

Thus, the second battery arrived quickly, but unfortunately defective. It lies not full load and at just over 7 volts the charger has switched off. I did it slowly with 1/10 C, ie 500 mA trying because I really always slow charging battery when it first loads. After that did not work, there was a second attempt, but with 2.5 A. Unfortunately, that was also unsuccessful.

The driving test has confirmed it. After a few minutes the battery was completely flat. Cell defective?
Therefore, the battery went back and was already refunded today.

After the first battery but as well by holding he gets a second chance and I have today ordered another one. Defective / production errors can always occur times, so there is (still) no devaluation. Let's see if the next battery is back to normal ...

Update 4/27/2014:

After the 2nd Battery went back, I immediately ordered the third battery. The read so far properly load and reaches a cut-off voltage of around 9 V. So everything's alright. The battery was initially charged again with 500mA and has subsequently undergone several charge cycles with 4A. Yesterday it had to go quickly and he has also participated 5A hesitation. He was indeed noticeably warm but not really hot. Meanwhile, he was charged and discharged 6 times and so far everything is fine. Therefore, there is in my view no reason to change the rating. The fact that the second battery was defective, is not an issue because the return was seamless. Manufacturing errors come just everywhere times. As long as that is not to my disadvantage, I can overlook that. From me therefore still an absolute buy recommendation ...