Sennheiser XSW-D XLR Base Set

I've used this product on our gigs with band. It has decent sound quality and handling, but the battery duration is very bad. If fully charged it will last for max 2-3 hours which is not enough for our concerts at the weddings or other major events we do. It doesn't help if you charge it while using it since it does not charge at this time.
Also signal loss is at 15-20m still noticeable, especially if there are any walls that block the signal.