Lithium-ion batteries are powerful, used in many devices, from cell phones to electric cars. versatile power sources that can be used in many applications. Despite their advantages, they still require maintenance and care to ensure they last as long as possible. Knowing when a lithium-ion battery is dead or close to it is an important part of this maintenance. This article will discuss what voltage is considered 'dead' for different types of lithium-ion batteries, such as LiFePO4 (lithium iron phosphate), LTO (lithium titanate oxide), and LiCo2 (lithium cobalt oxide). All battery pack are made of different quantity cells via in series and in parallels. So if you know Ohm rules, check specification from supplier. You can get the result what is a dead battery, and what is a good battery.
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If you test lfp cell only. The standard for a dead LiFePO4 battery is 3.0 V per cell. Cut-off min voltage is 2.5V, max charging voltage is 3.65 or 3.6V. When the voltage drops below this level, it means that the battery should no longer be used because it cannot store enough energy to power most applications. If you have multiple cells connected in series, then all of the cells must reach 3.0V before the entire battery is considered dead. When we test lifepo4 battery voltage is.
The standard for a dead LTO battery is 1.5V per cell. As with LiFePO4 batteries, if you have multiple cells connected in series then all of them must reach this voltage before the entire battery is considered dead.
Through LiCo2, LiMnO2, Ternary batteries material is not same. But it's nominal voltage is 3.7v, charge max voltage is 4.2V, discharge min voltage is 2.5V. The standard for a dead LiCo2 battery is 2.5V per cell but manufacturers recommend discharging these batteries to 2.8V per cell before recharging them again to ensure maximum life span and performance from each charge cycle. As with other types of lithium-ion batteries, if you have multiple cells connected in series then all of them must reach this voltage before the entire battery is considered dead.
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All cells display 0 V, maybe a dead. If we charge it choose specify charger, voltage it recovery to max voltage. Then battery is good. Otherwise, these batteries is dead.
Like I said, rechargeable lithium-ion batteries are everywhere! This is what makes getting these batteries cheap because people tend to toss old electronics that get broken or just stop working, but leave the battery inside. I usually get mine from the thrift store for pennies, or from old toys people give away or get broken and donate for science. The ones to look for are as follows: hand-held devices, cell phones, digital cameras or camcorders, portable DVD or video players, and my personal favorite, laptop batteries. There are different chemistries associated with rechargeable lithium-ion cells as well such as lithium cobalt oxide (ICR-type), lithium iron phosphate or LiFePO4, (you won't encounter these being thrown away often), lithium manganese oxide (IMR), lithium manganese nickle (INR) and lithium nickle manganese cobalt oxide (NCA or hybrid). The MOST common you will find are the ICR-type lithium cobalt oxide. It's the best for energy density and power, but has average to low discharge current and temperature threshold. The maximum discharge current for these is equal or at least double the capacity at most. Plus, they are less stable (read: dangerous) than the other types and need to have some kind of protection circuitry. Now, let's not confuse lithium-ion batteries with lithium-ion polymer batteries or LiPo batteries. In LiPo batteries the electrolyte, anode, and cathode, positive and negative terminals, are housed in polymer pouches. The internal chemistry is similar to lithium-ion cells. Depending on the device, the battery will be different in shape or size, but they are usually rectangular and thin for cell phones or compact devices, or cylindrical like (common in laptop batteries) or common in hump packs for cameras or camcorders.
In case you've ever wondered, the name of the battery contains its dimensions. "" means the battery is 18 mm in diameter and 65 mm long. The "0" is just hanging out. Regardless of the type or size, these may have a single cell, or multiple cells. Multiple cells are either in series or parallel, or a mix of both. Even small batteries can have two small cells inside connected in series or series/parallel. This is due to the fact that some devices have increased voltage needs more than a single cell can provide, or to add capacity. Series connections increase the voltage, and parallel connections increase the capacity of the pack. Unlike NiMH or NiCad batteries, lithium-ion battery packs will have some kind of protection device in them like a battery management system consisting of IC's and MOSFET's or resistors that regulate current, voltage, detect short circuits, reverse polarity, and temperature. Some have an added function of balancing the cells if there are multiple cells. Why do they need this? It's because the chemistry of the lithium cell makes it sensitive to over charging, over- discharging (draining until the voltage gets too low), short circuit, and even over temperature. Any of those can damage the cell, or worse, cause a fire. Multiple cell batteries in series need the balance function that makes sure each individual cell receives the same amount of current and voltage as the other cells. If one cell gets more charge than another one, it can wear out faster or get damaged. The capacity of the pack is also reduced. These types of batteries also require special charging procedures that NiMH or NiCad's don't. More on that later!
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