If you can still find some, I really like using the 2 Conductor wire from Model Power. They don't make much wire anymore and I love this as the 2 wires come together but can easily be pulled apart. The wires are a small enough gauge to carry the current if soldered properly and is quite flexible to get into small spaces and go around tight corners. I have many of these on hand as I would buy them up whenever they would be listed. They also make a 1 conductor and a 3 conductors wires which are both still easy to find.
Another favorite of mine is the Silicone covered (not normal plastic covered), pre-tinged wire. This is the most flexible and can be bought in lengths as I have 4" lengths in both black and red colors. These are single conductor wire so you would have to use 2 for what you describe going from battery Tender to Engine. This is very good stuff that is very flexible and easy to use. I wish they made these in a 2 conductor spool as I would buy some to have on hand.
![[Image: IMG-1123.jpg]](https://i.postimg.cc/qhr7185P/IMG-1123.jpg)
Another favorite of mine is the Silicone covered (not normal plastic covered), pre-tinged wire. This is the most flexible and can be bought in lengths as I have 4" lengths in both black and red colors. These are single conductor wire so you would have to use 2 for what you describe going from battery Tender to Engine. This is very good stuff that is very flexible and easy to use. I wish they made these in a 2 conductor spool as I would buy some to have on hand.
![[-]](https://www.blueplastictracks.org/images/collapse.png)