No, they aren't. The only advantage to AGM is being spill-proof they don't need to be mounted upright. Otherwise they cost more, need more careful charging, can't be serviced or recovered if abused. Places like Amazon like AGM since can they can be shipped easier, so buy FLA locally and use the savings for beer and gas. I do like them being sealed since it keeps the terminals from corroding but that's pure vanity and laziness."Why AGM over wet cells????"......You're kidding, right...
True, FLA will typically vent during charging while AGM shouldn't normally or at least it will be minimal. The correct modifier (is it extremely lower or just significantly lower?) is probably a matter of personal preference but it's not impossible and so probably wise to take the same precautions. Such as using a battery box vented outside.Dont forget venting and potential to explode.
Not to say AGM cant do either, but that possibility is extremely lower than wet batteries.
No one mentioned the durability of AGM. I replaced three trolling motor batteries, high end wet cell that typically last two to three years in my bass boat, with AGM's almost six years ago and they are still running strong. Most of the degradation of the wet cells in a boat is due to vibration, much like a trailer, so I would think the AGM's would be a better long term option. I questioned the 30% uplift I paid at the time, but it was well worth it.First question: why AGM and not flooded? Specifically flooded golf cart batteries, Rolls Surrette, Trojan or Crown. If your heart is set on AGM then Lifeline.
I'm not sure the linked Amazon example is even really AGM. It's probably a gel tolerant of higher voltage. AGM is technically still a wet cell but the electrolyte has been fully absorbed in the glass mat to make it immobile while the electrolyte in a gel is mixed with a silica to achieve the thickening. AGM is similar to a gel in that they are valve-regulated. Gel and AGM are distinct types that aren't 100% interchangeable charging or discharging profiles or ability to tolerate heat and cold necessarily. You really need to follow the manufacturer's instruction for the actual battery model you have.That Amazon unit is a joke, certainly not true deep cycling.
A pair of GC2's would beat the hell outta that.. over twice the capacity for roughly the same price, and it wont be some worthless no name fake deep cycle that'll be a boat anchor in 2yrs..I recently bought a couple AGM, 100Ah batteries from AMAZON. Been testing them extensively before the camping season begins. So far they are great. Can't beat the price ($179)
Amazon.com: Weize 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping Trolling Motor, in Series 24V 36V 48V: AutomotiveBuy Weize 12V 100AH Deep Cycle AGM SLA VRLA Battery for Solar System RV Camping Trolling Motor, in Series 24V 36V 48V: Batteries - Amazon.com ✓ FREE DELIVERY possible on eligible purchaseswww.amazon.com
"Why AGM over wet cells????"......You're kidding, right...