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Chandrasen Pena
Chandrasen Pena

Battery Charging Alert 3.20

You can receive alerts for when your computer is plugged in or unplugged, and when your battery percentage reaches a preset level, so you know when to plug in your computer to keep it from dying or to unplug it and save your battery life.

Battery Charging Alert 3.20

Battery Charging Alert is intended to prolong your battery life. In this respect, it can issue alerts on given battery-related events, which prevents battery dying due to accidentally unplugging the power source. The application is very unobtrusive and runs from the Menu Bar. It is shown as an icon there and, optionally, it can also be displayed as a Dock icon.

Battery Charging Alert is just right for you! With the app, you can receive alerts for when your computer is plugged in or unplugged, and when your battery percentage reaches a preset level, so you know when to plug in your computer to keep it from dying or to unplug it and save your battery life.

Charging and discharging batteries is a chemical reaction, but Li-ion is claimed to be the exception. Battery scientists talk about energies flowing in and out of the battery as part of ion movement between anode and cathode. This claim carries merits but if the scientists were totally right, then the battery would live forever. They blame capacity fade on ions getting trapped, but as with all battery systems, internal corrosion and other degenerative effects also known as parasitic reactions on the electrolyte and electrodes till play a role. (See BU-808b: What causes Li-ion to die?)

Some Li-ion packs may experience a temperature rise of about 5ºC (9ºF) when reaching full charge. This could be due to the protection circuit and/or elevated internal resistance. Discontinue using the battery or charger if the temperature rises more than 10ºC (18ºF) under moderate charging speeds.

When the battery is first put on charge, the voltage shoots up quickly. This behavior can be compared to lifting a weight with a rubber band, causing a lag. The capacity will eventually catch up when the battery is almost fully charged (Figure 3). This charge characteristic is typical of all batteries. The higher the charge current is, the larger the rubber-band effect will be. Cold temperatures or charging a cell with high internal resistance amplifies the effect.

Estimating SoC by reading the voltage of a charging battery is impractical; measuring the open circuit voltage (OCV) after the battery has rested for a few hours is a better indicator. As with all batteries, temperature affects the OCV, so does the active material of Li-ion. SoC of smartphones, laptops and other devices is estimated by coulomb counting. (See BU-903: How to Measure State-of-charge)

Some portable devices sit in a charge cradle in the ON position. The current drawn through the device is called the parasitic load and can distort the charge cycle. Battery manufacturers advise against parasitic loads while charging because they induce mini-cycles. This cannot always be avoided and a laptop connected to the AC main is such a case. The battery might be charged to 4.20V/cell and then discharged by the device. The stress level on the battery is high because the cycles occur at the high-voltage threshold, often also at elevated temperature.

While the traditional lithium-ion has a nominal cell voltage of 3.60V, Li-phosphate (LiFePO) makes an exception with a nominal cell voltage of 3.20V and charging to 3.65V. Relatively new is the Li-titanate (LTO) with a nominal cell voltage of 2.40V and charging to 2.85V. (See BU-205: Types of Lithium-ion)

Chargers for these non cobalt-blended Li-ions are not compatible with regular 3.60-volt Li-ion. Provision must be made to identify the systems and provide the correct voltage charging. A 3.60-volt lithium battery in a charger designed for Li-phosphate would not receive sufficient charge; a Li-phosphate in a regular charger would cause overcharge.

Lithium-ion is not the only battery that poses a safety hazard if overcharged. Lead- and nickel-based batteries are also known to melt down and cause fire if improperly handled. Properly designed charging equipment is paramount for all battery systems and temperature sensing is a reliable watchman.

This excellent article describes that dangerous overcharging is likely if we charge a 3.7V lithium ion cell at 4.2V and forget - in the constant voltage phase - to switch off charging after the current has dropped to one tenth of the initial value. But will this overcharging be a risk at *all* charging voltages all the way down to the minimum voltage that can move ions within the battery (around 3.4V, I guess). Put differently, is there a voltage between the minimum (3.4V?) and 4.2V at which it is safe to simply let the constant voltage phase run forever?If such a lower safe voltage does not exist, how long would it take before charging at, say, 3.9V would start to cause trouble? Hours, days, weeks?I'm asking because I have a setup that can store energy from solar panels in a lithium ion battery and where it would be ideal to just cap the charging voltage of each cell at 3.9V in place of introducing a real charger.

There is a lithium battery in my wifes battery box. It is 12 v for her mobility scooter.Apart from the word, "lithium" it gives no further details. She has a charger but that is for her secong battery that is a lead acid one.I believe its not suitable a charger for lithium's.Is there a way to tell which lithium type? Also what would be a typican current flow when charging the lithium battery and would the voltage by ok at 4 volts?Thank you.Dennis

Lead acid batteries cannot take a high voltage when charging like LiPoFe can when charging. Your motorcycle alternator charging system made for lead acid batteries and cannot overcharge your new LiPo battery unless the bike was left running for 24-48 hours strait. Even then there is a float charge where the battery will stop charging at the highest point, this is installed on the alternator and is set for a 12v battery and cannot be changed, or in some cases the battery itself will have a float limit installed. In short, a LiPoFe battery can take more charge faster than a lead acid battery can, so any charging system that will charge lead acid, will be like a trickle charger for the LiPoFe battery and will not harm the LiPoFe battery at all. As long as the lithium battery and lead acid charger are both rated for 12V. A lithium battery charger will damage a lead acid battery by overcharging it with high voltage. But not the other way around.

Given the complexity of battery charging across lead acid/ NIMH/ NIcad/ Li, how can they sell me an Li 12v battery for my motorcycle which originally came in 2004 with lead acid battery? Where's the regulation of current? It has to be in the battery, right?

Never be without the weather facts you need to keep your family safe. Made by Kaito, this rugged radio uses four sources of power: solar, crank, batteries, or adapter. The USB port also lets you charge it with a PC-or charge cell phones and other electronic gadgets with the crank. Receives AM, FM, shortwave, and 7 pre-set NOAA weather channels with alert. Built-in flashlight, rechargeable Ni-MH battery pack, 5-LED reading lamp, telescoping antenna, earphone jack, adapter tips, carry strap, rubberized water-resistant housing. Takes 3 AA batteries (not included). 8"w x 4 3/4"h x 2"d; about 1 1/2" lb. 6 ways to power:

Battery fit in my Chamberlain whisper quiet garage door opener. Since the battery comes charged it went right to work and banished the annoying low battery alert alarm. Slid into the opening with plenty of clearance. As a bonus the box it came in was great for storing the old battery until I can take it to the proper Township disposal site.

The xfce power manager is repeating, incessantly: "Your battery is charging", "Your battery is fully charged", "Your battery is charging", "Your battery is fully charged", "Your battery is charging", "Your battery is fully charged"... etc.

It is always plugged in, however maybe every hour or two I get notifications regarding the system's battery charging, then a little while later another one saying the battery is fully charged. It's always been a little annoying seeing those notifications, I'm not sure if it's something to do with having 2 built in batteries or what but I've even got the same messages when the laptop is plugged into a UPS instead of a surge protector so I don't think it's any kind of problem with the power surging here or anything like that. 041b061a72


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