Radio Shack rechargeable battery confusion

[Novel8]

I need eventually to replace my cordless radio shack phone's battery. I checked Amazon and there are replacements, but the 'mAh" were much higher than the existing battery. Mine reads NI-NH 2.4 v 400mAh, whereas those I see have much higher mAh, like 1600 to 3000, with various prices from 3.89 to 19dollars. I recall paying 2 dollars for mine. I don"t understand the differences in the "mAh" readin gs. I don't want my phone to be ruined by a higher reading.

 

[Eximo]

Just a larger capacity, so longer lasting. As long as you stick to NiMH it will work just fine.