The Anatomy of a Protected Battery. The Anatomy of a Protected LiIon Battery A protected battery will (hopefully) include the following protections: PTC, protect against over temperature and indirectly over current and will automatic reset.
CID or pressure valve, will disable the cell permanently if the pressure is to high in the cell (Can be due to over charge). PCB will protect against over discharge, over charge and over current, depending on design the PCB will reset automatic or when placed in a charger. On notebook batteries controlled by the BQ2092 and BQ2040 (and maybe others) On notebook batteries controlled by the BQ2092 and BQ2040 (and maybe others) Contents Downloads Battery refurbishment programs (a small download, linux required) - you'll need a Linux system with i2c 2.6.4 or higher, with the appropriate modules loaded.A bootable battery refurbishment CD (no hassle, a 7.5MB download) There are several download sites (a file this large cannot be placed at SWEB.CZ for free): Thanks to everyone who has provided storage space.
The compressed .tgz archive can be opened with WinZip, yielding an .iso CDrom image. It contains a minimalistic bootable Linux based on RedHat 8, text mode (no X) with the i2c-progs packaged in, a shell script presenting a menu, some basic goodies to facilitate freestyle improvising (vim, mc, basic system environment, five unrestricted shell consoles at ALT+F2 to ALT+F6), a bit of documentation. Either way, you'll need to solder the necessary wiring probes for the parallel port (see below). SMBus - external port. 18650 battery test 2011. 18650 battery test 2011 A 2012 test can be found here In this test I have measured many different 18650 batteries and collected the data in bar graphs and curves.
The above picture shows most of the cells I have tested. Capacity: Measured capacity at 0.2 ampere discharge rate (This is the average from the two tested cells). This is not measured the same way as the manufacture specified capacity, i.e. it is not supposed to be exactly the same value. This chart show the average capacity of the tested cells. This chart show the average energy of the tested cells. In this chart I have taken the difference between 0.2 and 2 ampere energy bar and calculated the change in percent of total energy ((Energy@0.2A - Energy@2A) /Energy@0.2A).
Physical dimensions 18650 batteries are not all the same size, they are supposed to be 18 mm in diameter and 65 mm long, but due to the added protection circuit they are up to 5 mm longer. Combined discharge curves. Proper Lithium-Ion battery charging and safety. CandlePowerForums. How to Repair a Laptop Battery – Battery University. Most laptop batteries are smart.
This means that the pack consists of two parts: the chemical cells and the digital circuit. If the cells are weak, cell replacement makes economic sense. While nickel-based cells are readily available, lithium-ion cells are commonly not sold over the counter, and most manufacturers only offer them to authorized pack assemblers. This precaution is understandable given liability issues. Read also about Safety Concerns and Protection Circuits. ICR18650NH-2200.pdf. 1 Cell LiPo / Li-ion Battery Charger CC&CV.
Batteries - Use a lithium ion battery from a laptop, for a small project? Charging Lithium-Ion Batteries – Battery University. Find out how to prolong battery life by using correct charge methods.
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?.) The Li ion charger is a voltage-limiting device that has similarities to the lead acid system. Charging Cobalt-blended Li-ion Li-ion with the traditional cathode materials of cobalt, nickel, manganese and aluminum typically charge to 4.20V/cell. Charging 18650 Li-ion batteries with my Accucell 6?