Review on iMah AAA Rechargeable Batteries 1.2V 550mAh Ni-MH, Compatible with Panasonic Cordless Phone Battery 1.2V 400mAh BK40AAABU, HHR-55AAABU (550mAh), and HHR-75AAA/B (750mAh) - 6-Pack by Matt Nichols

I purchased this product because it was specifically listed as compatible with Panasonic cordless phones. Number on my Panasonic batteries (in original packaging): BK-40AAABU 1.2V min 400 mAh When looking for replacement batteries I found batteries that were supposed to be for Panasonic cordless phones. Of course, several different battery number codes are listed (meaning they will work with more than one type of cordless phone), but the number listed above is displayed when I select the battery SKU for my Panasonic phone. It seems to be "up and down" so I bought it. When I received them I charged them until they were fully charged. There was no instruction in this loading guide. In fact, there were simply no instructions. 2 new fully charged batteries in a Panasonic cordless phone last no more than 19 hours before the power indicator drops from 4 bars to 2 bars. After another 5 hours they were completely discharged. powerless. When I bought my phone, the manual said that every phone should be in "standby" for "at least 72 hours" starting with fully charged batteries. I only have 22-24 hours on each phone with 2 new iMah batteries. My original Panasonic batteries lasted 38-40 hours of standby after almost 5 years. I'm not a happy tourist. I do not recommend. There's always a chance I have 6 stray batteries. And every customer has their own experience. This is my unsatisfied experience.