Top rated battery charger for an Infiniti G37 coupe?

Question

Hey everyone, I’m looking for some advice on a solid battery charger or tender for my Infiniti G37 coupe. Lately, I haven’t been driving it as much as I’d like, and with the colder weather moving in, I’ve noticed the crank is starting to feel a bit sluggish. The G37 electronics seem to draw a decent amount of power even when parked, and I really want to avoid coming out to a dead battery or, worse, frying any of the sensitive Infiniti modules with a cheap charger.

I’ve been looking at brands like CTEK and NOCO, but I’m a bit overwhelmed by the different models. I need something that is safe for long-term storage (set it and forget it) and ideally something that can handle an AGM battery if I decide to upgrade down the road. My budget is around $100, but I’m willing to spend a bit more if it means better peace of mind. Does anyone here have a specific model they use on their G37 that fits well under the hood or connects easily to the battery terminals? I'd love to hear what has worked best for you guys without causing any electrical gremlins!

wwziwtigjh · Accepted Answer

Hi there! I totally get the struggle with the G37's power draw; those Infiniti modules are super picky about voltage! Since you're looking for alternatives to what's been mentioned, you might find this useful—I've been looking into the NOCO GENIUS5 5-Amp Fully-Automatic Smart Charger lately and it seems like a fantastic technical fit for our cars. It's awesome because it handles AGM batteries perfectly and even has a force mode for totally dead ones!

Check out these resources for your install:
* The "MyG37" forums have some amazing DIY threads on permanent eyelet mounting.
* Look into the NOCO GC002 X-Connect M6 Eyelet Terminal if you want a clean, "set it and forget it" connection under the battery cover.

Pro tip: Stick to a 5-amp charger for the G37. It’s plenty of power to maintain the battery without getting things too hot! Honestly, I think the NOCO is a great budget-friendly pick that feels really high-quality. Hope this helps!

soyhiwxehr · Answer

Well, I've used the CTEK MXS 5.0 12V Battery Charger and Maintainer for years. I think it's safe for the G37's sensitive electronics, but be careful when hooking it up, honestly!

ikuphifygp · Answer

Quick question - are you planning to mount the charger permanently in the engine bay, or do you just want something to clip on while it sits in the garage? I've had some real headaches with the G37's sensitive electronics in the past, so I'm always super cautious about where people ground these things.

Honestly, I've had a pretty disappointing experience with some of the cheaper "smart" chargers failing mid-winter. If you want a solid comparison, I'd look at the Battery Tender Plus 12V, 1.25A Battery Charger and Maintainer versus something like the Victron BlueSmart IP65 12V 5A Battery Charger. The Battery Tender is the classic budget-friendly choice—super reliable for long-term storage, though it's a bit slow if the battery is already low. On the other hand, the Victron is professional-grade and has Bluetooth so you can check the voltage on your phone without popping the hood. Personally, I'd spend the extra $20 for the Victron just for the peace of mind. Let me know about your mounting plans though!