Welch-Allyn Pic 30, 40, 50 Superpac Battery 001647-U Rebuild Service. Why pay $200 for new when your 001647-U 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 company has been repairing Welch-Allyn batteries for many years and we have one of the best reputations for quality in the battery industry. If your company does repairs on equipment like this battery would go into please contact us as we can assist you with many other battery types as well.