This is especially important in highly cyclic applications where a device will be out of service for charging. In this comparison, the lithium battery has been fully charged before the SLA battery even reaches the constant voltage stage of its charging cycle, and charges in 1/3 the time of the SLA battery. Additionally, lithium batteries do not need to be kept on float charges because the lower self-discharge rate of the battery. The constant voltage charge stage only provides an additional 1% to the capacity with only 4% of the charge time. This means in the 12.8V 20AH lithium battery example above, the battery reaches nearly 100% SOC in just under two hours. In the constant current/bulk charging stage, the battery can absorb 99% of it’s capacity (SOC of 99%) in 96% of the charge time. However, in a charging cycle for lithium, there are only two stages: constant current and constant voltage. Additionally, the battery should be kept on a float charge for most applications to prevent the battery from going into an over-discharged state due to self-discharging of the chemistry. The constant voltage charge, which can also be called the absorption charge, charges the remaining 20% of the battery but also takes approximately 50% of the total charge time. In the 20Ah deep cycle SLA battery charging example above, the SLA battery has reached a State of Charge (SOC) of 80% during this phase – which is just over half of the total charging time. In the constant current stage, the battery is getting its bulk charge. In a charging cycle for SLA, there are three stages: constant current, constant voltage, and float charging. Charge absorption of lithium versus charge absorption of SLA But, the 12.8-volt 20-amp hour lithium iron phosphate battery took just over 2.5 hours to reach 100% SOC. For example, in the chart below we charged a 12-volt 20-amp hour deep cycle SLA battery, which took about 6.5 hours to reach 100% State of Charge (SOC). If you’ve ever had to wait around for an SLA battery to finish charging before you can use it in a device, you know that this is incredibly time consuming. You may have heard time and time again that lithium batteries charge very quickly, but exactly how quickly, and how much faster than SLA? What does this mean for you, the end user? And, ultimately, can you charge a lithium battery with a normal sealed lead acid charger? Charging Absorption Differences between SLA and Lithium One of the biggest advantages to lithium batteries is their faster charging capabilities versus their sealed lead acid counterparts. you probably have to use a special 1amp or less charger.Can I Charge a Lithium Battery with a Normal Charger? Idk about optima, but if they use AGM technology as i'm pretty sure i saw when i was looking at an optima at costco, i think you can't use a conventional charger or you will kill it. i guess i should have charged it at 1amp like what i've been reading online. it started after i took it off the charger, but after a week without using my car the battery drained again. surely enough my westco died, er well didnt hold charge. regardless, i didnt have a special 1amp charger, and since the tech sheet said 2amp for 18-24 hrs, i charged it at 2amp for 24+ hrs. i think the sheet was wrong, because most of the forums i've read about the westco says you should charge it at 1amp or less for 30hrs. When i purchased my westco miata battery, it came with a sheet specifying it MUST be charged at 2amp for 18-24 or you will destroy your battery. but anywho, batteries with AGM can't be charged with a conventional battery charger at 5-10 amps. but with optima, i think they use AGM and their 'gel' so i dont think it has acid in there at all. with AGM, the batteries dont leak acid since the glass matt absorbs it. i think its the same or similiar technology that optima uses in their batteries. Click to expand.i have a westco miata battery that uses AGM (absorption glass matt) technology.
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