When a battery is not at a fully charged state, sulfate crystal build on the plates and this robs you of power. In fact, it's best if you DO leave it on. You don't ever have to worry about leaving the charger on the battery for too long. The best kind of charger to use on a battery is a 3 stage smart charger. We've said it before and we'll say it again. It's the healthiest thing for a battery to be at 100% state of charge. Most smart battery chargers do not turn off at this point, yet it is completely safe to leave a battery in float mode for months to even years at a time. It's essentially the float stage where there is charge going into the battery at all times, but only at a safe rate to ensure a full state of charge and nothing more. That's where the term " trickle charger" comes from. The current will also decrease to a point where it's considered a trickle. The voltage will taper down and maintain at a steady 13.2-13.4 volts, which is the maximum voltage a 12 volt battery can hold. Either way, the float stage brings the battery all the way through and maintains the 100% state of charge. Some chargers enter float mode as early as 85% state of charge but others begin closer to 95%. *Actual state of charge Absorption Stage will enter will vary from charger to charger Stage 3 | Float Charge The current continuously declines until the battery almost reaches full capacity. For instance, the last remaining 20% of the battery takes much longer when compared to the first 20% during the bulk stage. The lower current going into the battery safely brings up the charge on the battery without overheating it. At this point most chargers will maintain a steady voltage, while the amperage declines. Once the battery has reached 80%* state of charge, the charger will enter the absorption stage. After reading the battery the charger determines which stage to properly charge at. Smart chargers will detect voltage and resistance from the battery prior to charging. There is no risk of overcharging in this stage because the battery hasn't even reached full yet. This stage will recharge batteries that are severely drained. If the charger is a 10 amp charger, and if the battery resistance allows for it, the charger will put out a full 10 amps. For the gel battery, the voltage should be no more than 14.2-14.3 volts. For a typical 12 volt AGM battery, the charging voltage going into a battery will reach 14.6-14.8 volts, while flooded batteries can be even higher. The level of charge that can be applied without overheating the battery is known as the battery's natural absorption rate. This first stage is typically where the highest voltage and amperage the charger is rated for will actually be used. The primary purpose of a battery charger is to recharge a battery. But here's the million dollar question: What are the 3 stages? What makes these chargers so different and efficient? Is it really worth it? Lets find out by going through each stage, one by one. Okay, so it's hard to deny that 3 stage chargers work and they work well. Almost all of the chargers we sell are 3 stage chargers. Basically, these types of chargers are safe, easy to use, and will not overcharge your battery. They are also called "smart chargers" or "micro processor controlled chargers". The best kind of charger to use on your battery is a 3 stage charger. You may have heard it said "you need a 3 stage charger." We've said it, and we'll say it again.
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