![]() ![]() 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. Can I Charge a Lithium Battery with a Normal Charger? ![]()
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