OK, try again…
There are basically four factors to consider.
– mAh (milliampere hours): how much you can use the battery before having to recharge it
– battery lifespan (or charge cycles): how many times you can use and recharge the battery before having to buy a new one
– manufacturer reliability
Battery manufacturers will list the typical mAh rating, although some are a little more than the rating and some are less than the rating. The battery lifespan is more difficult to determine before buying. Batteries loose capacity with each recharge, and different manufacturers may have different standards as to how much a battery has to recharge to still be considered fully useable. Is the battery still good when it only has 95% of its original capacity? 90%? 50%? If you are interested in a rather technical article on the subject, you can start here.
I have personally been quite happy with my inexpensive Watson 2500mAh rechargeables, but I am not a heavy flash user. The 2300mAh Watsons that I bought in 2017 are still running; the Energiser 2300mAh batteries I bought at the same time were getting old by 2021. I suspect others would be better able to answer you on that one. They have since come out with another battery, Watson CX, which are only 2000mAh, but are rated for 2100 recharges instead of 500. Eneloop by Panasonic seems to have a similar two-tier system, with 2000mAh 2100 charges and 2550mAh 500 charges.
Manufacturer reliability is the most difficult factor, but eneloops are generally the best reviewed by photographers. Here is a quick comparisson of reviews on B&H:
- This reply was modified 1 year, 1 month ago by David Frazer. Reason: adding details