We have had a few of these monitors go faulty in the past few months due to charging problems with the power supply. We also have had several battery problems. Due to cost of batteries from GE I contacted Euro Energy to see if they could supply us replacements but was told by them that they have had a look at the battery and have no intention of offering it for sale due to its construction.
We've only got one in an offsite rehab ward and it was nothing but trouble was repaired by GE a couple of times and eventually GE replaced it with a PRO 400 plus a load of spare cuffs and consumables etc