If your 3.7v lithium-ion battery’s voltage drops to below 1.5volts, it’s dead. Most lithium-ion batteries have a nominal voltage of between 3.7v-4.2v. The minimum safe voltage is usually around 2.7v, and the manufacturers normally indicate it on the manual. When the battery goes below the indicated minimum voltage, it’s dead.

A battery is considered dead when it drains to a charge near zero. While a battery with a charge of just under 11.5 volts does likely not have enough power to start a vehicle, it is still not completely dead. But when a battery sits too long at a deficient charge (below 11.5V), it will soon become completely dead due to internal sulfation.

How do you discharge a lithium ion battery? Set the charger to the LiPo/Li-on mode and charge at a low current, like 200 to 300 mA. Let it run until it’s fully-charged. Then discharge it at a low setting, 500 mA. Let it discharge fully and note the charged capacity, and the amount of discharged capacity.

Symptom 1: Low voltage. If the voltage is below 2V, the internal structure of lithium battery will be damaged, and the battery life will be affected. Root cause 1: High self-discharge, which causes low voltage. Solution : Charge the bare lithium battery directly using the charger with over-voltage protection, but do not use universal charge.

Lots of advice — some of it conflicting — circulates about whether to leave the battery on the charger all the time, and whether to let the batteries drain completely before recharging. For lithium-ion batteries, overcharging and completely discharging them can cut down on the overall life of the battery, Koenig says.

If a lithium-ion battery hits a real 0% charge, then it won’t be able to recharge. Completely draining a lithium-ion cell damages the cell. There are repair procedures that can undo this, but without those procedures, a fully drained lithium-ion battery never charges again. So, cold temperatures make it easier for a phone to enter this state. ^{The frequency of charging your smartphone is directly proportional to the smartphone’s battery life. Thus, avoid draining your phone’s battery to the lowest level or 0. Unlike traditional nickel batteries, lithium-ion batteries will deteriorate by: Extreme battery charge; The amount of battery juices consumed before recharging}

Here’s Apple’s take: “Charge your Apple lithium-ion battery whenever you want. There’s no need to let it discharge 100% before recharging. Apple lithium-ion batteries work in charge cycles

The capacity of a battery in an application will depend on the device drain rate and the cutoff voltage. In general, lithium coin cells are more efficient at lower drain rates. Device circuitry that has a high cutoff voltage (i.e. greater than 2 volts) will leave capacity unused in the battery when the device stops working. 1.6 1.8 2.0 2.2 2.4 The multimeter will show if the battery has voltage and amperage. A lithium-ion battery is dead when it reaches a voltage of 1.5 volts. This can be done using a multimeter, but you should also check the battery’s capacity and age to ensure that it is not faulty. Reference: at what voltage is a lithium-ion battery dead.

Predicting the lifetime of a lithium-ion battery is of pivotal importance for many applications. In such applications, the battery operating profile should be characterized in detail. For instance, as already indicated herein, during the operation of an EV or a battery tied to a renewable-energy system, different micro-cycles take place.

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lithium ion battery drain completely