Sennheiser BA 10 Rechargeable Battery Pack

The BA 10 replaces disposable AA cells in an evolution wireless D1 SKM handheld transmitter with a single rechargeable lithium-ion pack, good for 2.2 Ah at 3.6 V. It charges over a Micro USB socket, so it tops off from the same charger, power bank, or laptop port as the rest of a touring kit.

Beyond the D1 handheld it fits SpeechLine Digital Wireless SL Handheld DW transmitters and the AVX SKM AVX-835, so one style of spare pack covers several product lines in a rental or house-of-worship inventory.