The only issue you may encounter is with the handsets battery monitor
(if in fact you have one). I've done the same with my Siemens
cordless phone and find it reports that it's always half full. On the
flipside, it can now last approximately a week or 2 without charging,
instead of a day as before. :)
With digi-cam AA batteries, I find that the mA labels are pretty true. There
are always web site blogs and camera-buff magazines doing battery-life
comparisons and reporting which brand is giving more flashes than another.
This, I think, helps keep the manufacturers' claims "honest".
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.