Our new portable phone and answering system has been gradually dying, largely due to batteries that aren't worth a darn. I priced batteries on-line and didn't find any reasonably priced replacements (as I recall, something on the order of $20 per phone for each of the three extensions). This seemed pretty expensive.
Today, we went to an overstock clearance sale near where we live and I picked up a four-line DECT 6.0 system from Panasonic that uses a pair of AAA rechargeables in each phone. It cost $57.