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Typically, AGM have very little self-drain and will sit for months. Does your bike have a clock or radio that requires a constant electrical supply for memory? That might draw a battery down over time. I don't use any special chargers and I routinely get 10 years on an AGM. Mild California climate.Patrick HayesFremont CA
Don't charge it over 14 volts. I have one old charger that stays just under that in the 2 amp mode. My agm is over ten years old. If you put a charger on it, also hook up a voltmeter .
They are still lead acid batteries and need about 14.5 volts to fully charge..
Hi Vince, When you get your new battery measure the height of the old one compared to the new as I had to add a 1/2" to 5/8" spacer under the battery otherwise it will crush down on your coolant bottle. The top bracket holds the bottle in place, no biggie just look for the difference. Paul :BEER:
I thought these AGM's were no frills?? You guys are making these things out to sound like LiFe batteries.
I would read the instructions that come with the battery. :BEER:Matt
That's good, I thought I might be hurting it when it went up to 15 sometimes, I haven't been always successful at keeping it at or under 14 v
That wouldn't be any fun ;D Dusty
An auto amp charger would be a better charger. Mine can start a 40A 12V then work it's way down to show what the battery is drawing. A 2A or !A charger will not push enough into the battery.
Batteries do not draw current, they accept it. Appliances and accessories draw current. As a battery is charged, the internal resistance increases and smart chargers sense this and adjust their voltage and current accordingly. It is therefore a good practice to use a charger designed to the capacities of the batteries you are charging. An appliance will only use the current it needs so long as the voltage is compatible. A battery will accept a greater voltage and current than it was designed for and not do anything but sit there until it gets damaged or does some other nasty thing.A 1.5 or 2 amp charger does have enough voltage and current to charge a motorcycle battery, especially an AGM. AGM have far less resistance than flooded batteries and the amount of current need to charge a battery is relative to the capacity of the battery.Motorcycle batteries have far less capacity than those use in cars and so on, you do not need a large capacity charger. If you need more than a 1.5-2 amp charge on a motorcycle battery, then that battery has been discharged far below what should be happening and there are other problems in their the charging system or the amount of accessories drawing on the battery.AGM battery can however, accept very high current rates to charge very quickly. Unlike flooded (the kind where you add water) batteries, you can put a high current on an AGM so long as the voltage is compatible and charge an AGM in minutes, not hours. To do this though, you need very good chargers, not the Home Depot, Sears or many other chargers that you'd not question about using to charge farm implement or car/truck batteries.You should be very wary of using high current chargers on motorcycle batteries because of their limited capacity and unless it is a very good charger, you can toast your battery. Batteries are not like appliances where the source only supplies the current needed if the voltages are compatible. A battery will not refuse current, it simply self destructs or gets damaged.The whole point is that if you keep needing to charge your battery, something is wrong and the better approach should be to address the root cause of the problem, not slap band-aid fixes on it.