Only about one in three of these batteries lasts for a period of time functioning all day and sometimes they die after a few hours. There is no reason for a difference in performance. I constantly check that they have good contact both in the charger (EBL brand charger for AA and AAA) and in the block .there is no difference.sometimes they work and sometimes (usually when it's very necessary.) they don't disappoint , to put it mildly.
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