We had the same problem recently.
Rather than have the hassle with anybody, we bought a really good battery - locally. Replaced the yellow Ionics one and have so far had no problems. Ionics fit the yellow one March 10 after servicing our system, and after reading posts on here we quickly realised there was/is a problem with the batteries they supply.
We have used there stuff for a number of years, but next time we buy one of their systems, we won't ask them to supply the battery.