AGM Batteries vs GEL Batteries for Marine Applications
For marine applications, there is a clear cut winner between these two technologies of batteries. AGM will always beat a GEL battery for marine applications. Simply put, any AGM battery is stronger, lasts longer, and is safer than any gel battery on the market.
AGM is Stronger:
AGM batteries are able to supply amperages that would kill the GEL battery. The GEL can not compete with the AGM construction either as a starting battery or as a deep cycle battery. Basically the jelly or GEL inside a GEL battery will be scarred by high amperage charging or discharging. The AGM battery on the other hand is designed to push the load, no matter the amperage required.
AGM lasts longer:
The lower internal resistance inside a AGM battery makes them slightly more efficient than a GEL battery. GEL Batteries, being rather more efficient than flooded batteries, are a good choice for long lasting systems though. Each of these batteries is designed to recover much of the gassing, and return it to electrolyte inside the operational battery to eliminate maintenance and prolong life. However, the AGM battery is designed to recombine the gases no matter how they originate. GEL batteries have a design flaw in the GEL, it can trap sizeable amount of H2 or O2 gas, which is explosive, and has lead to some explosions and catastrophic failures.
AGM is SAFER TOO:
ACID LEAKS ==> Hazardous Material
AGM batteries are designed to never leak the ACID. When the battery is cracked in half, and squashed between weights to squeeze out the electrolyte, only a few drops come out. This makes them far safer than any other type of battery on the market because they simply hold onto that ACID. You will not have corrosion to the boat, electronics, or connections. Your kids can't get acid on their clothes. You can't put acid in the water supply. GEL batteries on the other hand do liquify the jellied ACID under charge. This creates a time in each charge and discharge cycle for you to spill acid everywhere.
EXPLOSIONS ==> VERY BAD DAY ON THE WATER!!!
Both AGM and GEL Batteries are designed to either recombine or vent size able amounts of explosive or flammable gases. AGM Batteries do this very efficiently as there is nowhere inside the case to trap the explosive mixture. GEL batteries on the other hand can develop voids (pockets) in the jellied acid as they are either charged or discharged too heavily. The charge/discharge, at too high a rate, burns the jellied acid leaving the pocket. These pockets, when filled with H2 gas, can lead to explosions, and have ended a number of battery's lives prematurely.
This Marine Battery website shows you how to electrically hook up circuits, install batteries, and run wires for your marine application. You as the consumer are assumed to be using this marine battery information site as a reference tool. The marine battery information herein has been checked, but is not warranted.