why there is a third connection in my battery powered vaccum cleaner. ? battery voltage reading is zero. i wnat to replace battery. but i don't know what this third connection means? :
Zhiyun Smooth 4 3-Axis Handheld Gimbal Stabilizer Black SMOOTH-4 - Best Buy
Zhiyun Smooth 5 Combo 3-Axis Focus Pull & Zoom Capability Handheld Smartphone Gimbal Stabilizer For iPhone 13 12 Pro 11 X 8 7 Plus 6 Plus Samsung Galaxy S22 S21 S20 - Walmart.com
Amazon.com: Zhiyun Smooth 4 3-Axis Smartphone Gimbal Stabilizer for iPhone 11 PRO XS Max XR X 8 Plus 7 6 SE Android Phone Filming Vlog Youtuber Live Video Record(Plate Adapter for Gopro/Counterweight
Zhiyun Smooth 4 (Open Box) Gimbal for Smartphones
Zhiyun Smooth 4 BROKEN?? - red light error, battery & Moment stabilization counterweights - YouTube
ZHIYUN Smooth 4 5 3 Axis Handheld Gimbal Smartphone Stabilizer for IPhone 13 PRO Huawei Xiaomi Redmi Phone For Vlog Live Video - AliExpress
Review: Trying out Zhiyun's top-of-the-line Smooth 5 mobile gimbal
ZhiYun Smooth 4 Disassembly and Battery Replacement in 5 minutes - YouTube
Zhiyun-Tech Smooth-5 Smartphone Gimbal
Smooth as Ice – A Zhiyun Smooth 4 Gimbal Review - Qwerty Articles