I was afraid they might not work in Vtech wireless system phones. The original batteries in the phone have a capacity of 300 mAh. The manual for the phone states 3.5 hours of talk time. They are rated at 600mAh. I hope they extend the talk time. Has worked well so far. I can't say anything about durability yet. These are basic AAA batteries, so you could theoretically buy even more mAh if you want to solder proprietary lines. So far there are no problems with the speaking time.
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