Very good batteries, I chose them for my cordless phone with 1000mAh to last longer. When charged and discharged correctly, there is no problem. As a technician, I have to say that in the hot summer months, for safety reasons, depending on the device, they have a circuit that controls the temperature during charging, which means that the battery charging will be cut off, so it will not be fully charged to 100%, resulting in memory damage. It would be better to charge them during the evening hours if it is a cordless phone and at the right time according to the manufacturer's recommended mAh charging time, rather than continuously on the base. It is good to discharge NiMh batteries to 0% and not halfway like a lithium battery.