I recommend it to everyone, if you have some conaissances in the areas of capacity, current, voltage, resistance, short, in electricity and electronics, c'set the best that I was able to test, I even bought 3 in total so it myself please, with him it's simple, you take a battery in top form, which did not experience overload or anything tt, you load up that you can, you wait 2-3 days, and you raise a load 2 Ah (with battery 2100 mAh), theoretically, the batteries will qusiment loaded to the max, in 2-3 days, the self-discharge will be really minimal, this is a true story, I launched the load is 2 Ah, between 20 and 30 seconds the load was over. This is the first charger which I saw me his, the greater part of the trade magazine, finally I would rather any other charger I tried was sold commercially, would have loaded max 30 min and min 10 min, about, so even at 10 minutes, there is overload and the load current, the higher the surcharge will imortante, thus devastating the batteries, it will reduce capacity as known the batteries, but also increase its self-discharge, basically it faster discharge time without using it, the more we wait, the more its resistance increases, and therefore it will be increasingly difficult to recover finally made this the place, you really overloading exceeding reasonable limits, or discharge it too, this has almost the same effect, and I stress the preque because it is more lethal limit for batteries, since overcharging as I di earlier reduced its rated capacity, while deep discharge, increases its internal resistance, so it will preload the hand to reduce its resistance, in order to recharge but the batteries so that the resistance varies funcon, I advise you not to use them, finally it depent utility that you have, it will be used often, di not back to square one . This charger will cut short the discharge to 0.90 V, so no danger. Since I have this charger, my new battery remains in top form, and those not already damaged the former chargurs low overload range, remain at the same point, do not improve and does not degrade abnormally [Email protected]