Whats your recommended 12v auto battery charger?

[TWIH]

The number of boating and fishing forum posts I've read suggest that the norm is to recharge the marine or AGM trolling motor batteries overnight/all day before the trip on a std automotive battery charger. If it works for them, why not for us? 

They go fishing on Saturday.  That makes it one cycle per week during the time when fishing happens.  If the battery lasts a year that might be 12 cycles.  My cheap flooded trolling motor battery has lasted 3 years because it gets fully charged regularly and I seriously avoid discharging it more after a partial charge.

Give a man a fish and he'll eat for a day.  Teach a man to fish and he'll sit in a boat and drink beer all day.

Than you for your reply. I can't go the complicated instrument or hobbyist route, this is only for what, 3-4x a year charging needs. I might not even need to buy a charger since all relatives have their own versions for their own vehicles. Trouble is, the SIL's little Honda Civic has a 2 amp maintainer, so I'd need something bigger while there.

Do you only recharge your marine 12v from the alternator, use alternator and solar or what? 

I understand that shallow cycling gives longevity, and if an individual does not run a powered roof fan or a 12v compressor fridg, (and doesn't constantly stream movies or use a gaming device), then their electrical loads are reduced such that a minimal house battery is needed (like your setup). 

I've even considered one of those "solar generator" misnomer Li Ion devices around the 240 watts size (don't have the coin for the new 500 watt ones). They are small enough to be taken into a coffee shop, bookstore or library and plugged in while I loiter there. Trouble is they usually charge so slowly that if depleted can take 8-10 hrs. Guess the trick is to not fully deplete them!

The WM cheapo marine battery might handle basic loads but I don't believe that I could make it work given a roof fan (in the summer) and a compressor fridg. Thus the question for occasionally charging the two GC's.

Despite the electrical gurus best advice, I'm just not that deep into electronics or making up my own equipment. I simply want a basic recharge option that's cost-effective, simple to use and has some protection circuitry built in.  Currently for my PT goings in and out, the craptastic Centex 2/10 plus driving seem to work fine, but that's only PT use with a starting battery as my only source (yeah I know, risky but I have two 17 ah lead acid jump boxes besides). 

Thanks all, maybe this is frustrating for those of you with access to ac but I don't plan on having that luxury.