Hi There I bought a foldable Samebike on Gearbest about 3 months ago. I decided to try and source a second battery which is housed within the frame. I got one eventually on DH Gate which arrived two days ago. I charged it up fully and when I fitted it to the bike no power. I put a volt metre on it and displays zero. The battery is 10 ah and 48 volts. There is no buttons on the battery just a loch mechanism. Can anyone help me bring this battery to life?? Thankyou