chain or security cable?

for a gate that needs locking up. had a nice electric system but some assholes broke and stole the pole and solar panel. dipshits left two good batteries that were just in a plastic box. so now I need to go lower tech until I get angry and flush enough to fix the system with added security cameras.

also recommendations on resettable combo locks much appreciated, I am leaning towards https://www.amazon.com/dp/B001C4TEKU/ref=psdc_511382_t2_B004FF3A94