The CHG 2 from Sennheiser is a 2-bay tabletop charger with a US power supply for the Sennheiser Wireless SL, DW, ew D1, and AVX Series system (sold separately). The universal charging slots for either bodypack or handheld can be used to charge the optional BA 30/BA 10 rechargeable batteries (sold separately) for those units.
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I bought this to more conveniently charge our AVX-ME2 systems, so imagine my surprise when I opened the box to find out that it does not charge the receiver's BA20 battery, only the transmitter pack. What's the point then, Sennheiser?? I will be returning this half useless hunk of plastic
First, without the wireless handheld attached, a BA10 battery pack won't reliably remain seated. So, unless you have two transmitters an extra bay is useless. Secondly, $199 for a charger is a pretty big ask. These things said, the unit charges the transmitter battery in a timely/efficient manner and appears to be well built. If this is a worthwhile expenditure for your situation will ultimately depend on how you intend to use your device(s).