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.

LiFePO4 Batteries

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.

LTO Batteries

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.

LiCo2, LiMnO2 & Ternary Batteries

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.

Summary

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.