Review on Panasonic eneloop pro AA Ni-MH Rechargeable Batteries, 8 Pack - High Capacity and Pre-Charged by Anne Miller

First of all I want to say that I like these batteries. Having recently returned to flash photography, I was faced with the sheer number of batteries I needed. Having not bought NiMH batteries for about 15 years, I did a little research and found these batteries to be highly recommended. Let me start with a little background on what led to my decision. First, these batteries are pre-charged. This may seem insignificant, but it means two things. First, they're ready to go: since even a quick charge takes about 3 hours, it's a godsend for the impatient. The second conclusion is that they hold a charge well on the shelf (85% capacity after 1 year, 70% capacity after 5 years are stated). Considering my historical experience with NiMHs, they lose 50% of their charge in about a month, that's excellent. This makes a huge difference for me as I have 4 camera flashes that I use but 2 are used way more than the others but I know the rest will be fine if I leave them with some charge. The second factor is tension. . When fresh they deliver around 1.35V and their voltage remains relatively constant throughout the discharge cycle down to around 1.2V. This is unlike alkaline batteries which typically start at around 1.6V but over time of the cycle drop rapidly. For most purposes the voltage is sufficient (although some older devices may report a low battery level) and corresponds to the following factor. The effective capacity of a typical alkaline battery decreases in proportion to the current drawn, providing a less stable voltage. The effective capacity of NiMH remains relatively stable regardless of the current drawn, as does the voltage. This means that in applications with high power consumption (e.g. lightning) the voltage does not drop, which leads to a temporary stoppage of the device or a shortened lifespan. The ability to deliver high current (low internal resistance) also means that a device such as a flashlight will have a much faster recharge time than alkaline batteries and will not drop as much as the battery discharges. Finally the container. Lightning is a sudden, severe discharge of the battery, which is the worst case scenario for many types of cells. I don't have a good point of comparison but when I tried some of them on remote triggers with the same output power versus alkaline ones; They showed no drop in performance when the etchants were reduced to unusable cycle times. I was also able to use them for about the same amount the next day before having to charge them, given that in my case I got double the life of the alkaline ones. In general, these batteries work very well. I haven't compared them to the competition but after reading some of the reviews from people who have compared them my unofficial assessment of their high performance, durability and capacity is confirmed.