Rebuild service for an HA-Z204 Rohde & Schwarz battery pack. Why pay ridiculous amounts for new when your HA-Z204 battery can be rebuilt for less by a very reputable company? You must send your battery to us for repair and we will rebuild and send your exact case back to you. We will not swap your case with another so you know you are not getting back a lesser quality. Our rebuild will be done with high-quality 6.0Ah cells. Our company has been repairing HA-Z204 Rohde & Schwarz batteries for many years and we have one of the best reputations for quality in the battery industry.