I have a Viking charger/maintainer, as it says on the box. Wouldn't this do the job of a trickle charger too or does it have to be the Battery Tender? I've lost a lot of batteries to cold weather storage.
Yessir. And you obtain a certain set of skills when you have a need and no money. I've told countless people that I learned more about cars when I used to own ones that broke often and I had to fix them myself, than I have since......
I had more than one battery fail, even keeping it indoors over the winter. Those were before AGM batteries were really common and were flooded cell type. Keeping them on a maintainer kept them topped up. I was financially challenged at the time, so I robbed some parts from scrap electronics and built my own maintainer. It would cycle between float mode and equalization mode. I just had to make sure it was fully charged before I started so I used my car battery charger for that. Worked pretty well. I think I still have it in the back of the garage somewhere. You learn a lot about batteries when you have a certain set of skills and no money.