For this price no top unit of measurement technology can be expected. The fact that no single batteries can be charged (only in pairs), leaves the Advent assumption that the device has no electronic supervision of each cell, which is a disadvantage. The device is included in the review and detecting the batteries are very sensitive. Has a battery in the capacity only a small mistake, these are battery and the "neighbor-battery" not recognized and not charged. In more expensive chargers still done charging with reduced capacity. (I've tried). The charging status is, contrary to the opinion of another reviewer, indicated roughly by 3 single Balken.Wer so very high demands on the charging technology provides, (Z. B. with single channel charge, precise display, etc.) should not buy this charger and prefer to spend a little more money for possibly more precise and more sophisticated technology. In normal situations, this easy-to-use device is sufficient but for completely and is highly recommended. Greeting Bert. Plate