When these stages kick in, they will cause pretty much every good quality LiFePO4 battery on the market with an internal BMS to go into high voltage disconnect protection mode at around 15.0V – the battery goes open circuit and the charger and all loads disconnect before starting all over again once it resets (if it auto resets – not all BMS will do this automatically). Or lead acid chargers have equalization as an automatic stage that cannot be turned off. It can heavily reduce the life of the cells due to regular over voltage charging or cause irreversible damage to the battery. This is really important to correctly charge and to maintain lead acid batteries, to avoid stratification of the electrolyte and ensure proper voltage equalisation of the cells, but are definitely not suitable for LiFePO4 batteries. Many lead acid chargers have desulphation and equalisation stages built in, which will pulse high voltages of 15.3-15.8V into the battery. Lithium batteries require a Constant current/Constant voltage (CC/CV) charge type with simple Bulk, Absorption, Float stages. The reality is that there are only a very limited few that will accurately and safely charge a Lithium Iron Phosphate battery correctly and to full states of charge, whilst doing so efficiently especially when using solar when you want to get the maximum output from it to your batteries. Other sellers out there claiming you can use your existing lead acid charger. Can I charge my LiFePO4 lithium battery with lead acid charger? Charging type VRLA chargers and other lithium-ion batteries’ chargers do not output the correct voltage for charging the battery fully. No special brand requirement, other programmable chargers can also be used if needed and should be set to output 14.4V and disconnected after charging. Most LiFePO4 chargers have an output of 14.6V – 14.8V which will charge ELB Lithium batteries, and any LiFePO4 fully. Which kind of lithium charger can I use for LiFePO4 batteries? Please note: Seeing a low voltage of <1V is evidence that the B.M.S. This flat voltage curve is why ELB Lithium batteries have twice the usable power even though the battery has the same amount of energy inside the battery.Ī 100Ah ELB Lithium battery will last twice as long as a 100Ah AGM or lead acid battery even though the name plate or energy rating is the same. Lead acid batteries have a steep voltage drop and it is common that a lead acid battery’s voltage is no longer useable when the battery still have 60% of capacity left. This means that the voltage will be fairly steady throughout use, and only drop below a useful voltage when the battery is nearly empty. ELB Lithium Iron Phosphate batteries have a flat voltage curve. They provide consistent power between 13.4 to about 12.8V and quickly deplete to 9.7V at the end of the discharge. For example, a 24V battery bank requires a charger voltage of 28.8V, 36V requires 43.2V, etc.ĮLB Lithium Battery Voltage | Recommended Charging Voltage | Recommended Charging Speed (C)ġ2 Volts | 14.4 Volts | <0.3C (3 hours or more)Ģ4 Volts | 28.8 Volts | <0.3C (3 hours or more)ģ6 Volts | 43.2 Volts | <0.3C (3 hours or more)Ĥ8 Volts | 57.6 Volts | <0.3C (3 hours or more)Ħ0 Volts | 72.0 Volts | <0.3C (3 hours or more)ħ2 Volts | 86.4 Volts | <0.3C (3 hours or more) What is the battery voltage when my battery is full or depleted?īatteries measure around 14.4V when they are fully charged and quickly drop to about 13.4V when the charger is removed. For batteries wired in series multiply 14.4V by the number of batteries. Voltage requirementĮLB Lithium Iron Phosphate (LiFePO4) 12V batteries should be charged at 14.4 Volts (V). If you do charge below freezing temperatures, you must make sure the charge current is 5-10% of the capacity of the battery. They also don’t have a memory effect, so you don’t have to drain them completely before charging.ĮLB LiFePO4 batteries can safely charge at temperatures between -4☏ – 131☏ (0☌ – 55☌) – however, we recommend charging in temperatures above 32☏ (0☌). Unlike lead-acid batteries, lithium iron phosphate batteries do not get damaged if they are left in a partial state of charge, so you don’t have to stress about getting them charged immediately after use. If you let them drain completely, you won’t be able to use them until they get some charge. Just like your cell phone, you can charge your lithium iron phosphate batteries whenever you want. Charging lithium iron phosphate LiFePO4 battery Charge condition Here we’d like to introduce the points that we need to pay attention to, here is the main points. Properly charge lithium battery is critical and directly impacts the performance and life of the battery. When switching from a lead-acid battery to a lithium iron phosphate battery.
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