what do you think of trade-me battery replacements for cordless phones like:

http://www.trademe.co.nz/electronics-photography/phone-fax/cordless-phones/auction-430943381.htm

http://www.trademe.co.nz/electronics-photography/phone-fax/cordless-phones/auction-430584946.htm

Any good, are they safe? just asking because i know the likes of the cheap **** import laptop chargers which are basically unsafe and a fire risk