I seem to have clumsily broken off the small wire on the battery positive terminal when re-installing the battery after charging. I believe the gizmo where the small wire is attached to the +ve terminal is a fusible link. Can anyone tell me what amp rating this link is? I'll get some fusible wire and solder it in.

 

Stand down on this; I initially thought that there was a very short length of fusible wire contained in the heat shrink at the end of the wire- it turns out that there is about 4" of fusible wire and the heat shrink is at the end of it where it joins to a short piece of normal wire which is crimped to the terminal. I stripped this back a little and crimped another terminal on. All back together and no charge warning on the dash.
Still waiting for my new multimeter to arrive so I can investigate the parasitic drain.