I manaxed to break my s60 light's battery cable

@micro_s how good are your soldering skills. take a look at the cable,, right by the connector. You see that it even lists the contacts and where these go: (P+) (NTC) (P-) Now, use a couple of strands of copper wire, like from an old LVDS cable etc. Something thin. Solder those from the battery to the connector. So instead of trying to repair your flex cable, simply apply jumper wires. Of course, after soldering, ensure that those wires are insulated so as not to shorten out on either the chassis, or amongst itself.

Easiest fix would be to not fix it at all, but to replace the battery, as my esteemed colleague already mentioned :-)