Yes, I highly recommend a magnetic USB cable. In case you haven’t seen it, also have a look at this topic: ✏ Fairphone 1 battery specs and facts
Ps: At some point (before you get crazy) you should consider selling/donating your working FP1 parts (working screen???) and buy a FP2. It sells at 399€ now and it’s definitely better than buying unfair stuff to keep your Fairphone 1 alive. 