Synergy Digital Cordless Phone Battery, Compatible with Panasonic HHR55AAABU Cordless Phone, (Ni-MH, 1.2V, 1000 mAh) Ultra Hi-Capacity Battery

I've used these in our phones for a number of years and it they have always performed well and lasted a very long time. I do recommend these.

Too soon to tell the longevity of these batteries. Should last several years, as did the OEM supplied batteries. However, once installed, they reached full charge quickly and seem to last during longer phone calls. That's all I can ask. I recommend.

Only used 2 of the 4 batteries, but have bought these before without problems. Work well in my Panasonic cordless phones. Have not failed in the years I've been using them.

Just put them in a month ago, so far okay

These are identical (upgraded actually) to the rechargeable batteries in my Panasonic portable phone. When those quit after several years (I left the phone off the charger for more than a month and the old ones didn't recharge well), I wanted to be sure that the replacements were top-quality and couldn't catch fire or otherwise damage my phone. I bought these and am very happy with them.

Arrived as advertised. Difficult to open package. Working ok so far - 5 days.

Exactly what I had hoped for.

Just got them and they're working, I DID have to return another brand, so buy these...