If you have a car that isn't showroom fresh anymore, there's also a good chance it's lost a little of its air conditioning mojo. Get things icy cool again with this simple fix. Photo by Dan Bock.First, a disclaimer. If your air conditioning is completely dysfunctional and doesn't cool the air at all when it's on, it's probably best to brave the bill and go get it checked out by a professional. On the other hand, if your air conditioner is functional but lacks the frosty punch it used to have, you can easily recharge the coolant and get things back to their previous knuckle-freezing glory. How-to site wikiHow features a step-by-step guide to recharging the refrigerant in your car's cooling system. The tutorial includes some pretty stern (and justifiably so) warnings, but speaking from experience—I've recharged around a dozen vehicles both for myself and friends—it's a really straightforward tune as long as you follow the instructions.A few things we'd recommend should you decided to recharge your air conditioning: Put a meat thermometer in the vents to get a baseline temperature so you can see if your recharge job lowers the temp enough, and spend the extra few bucks to get a pressure valve so you're not left guessing if you're under or overpressurizing your system.

If a simple top off doesn't do it, make sure to read this primer from the EPA before taking it in to get looked at by a professional. Tuned up your own air conditioner before? Let's hear about it in the comments. How To Recharge the Air Conditioner in a Car [wikiHow]We can't seem to find the page you're looking for.Seems like you are coming from France! Do you want to visit our Website in your country?Innovation in Li-ion Battery: LiFePO 4 Power Battery, Faster charging and Although small capacity Li-ion (polymer) Battery containing lithium cobalt oxide (LiCoO 2) offers a the best mass energy density and volume energy density available, lithium cobalt oxide (LiCoO2) is very expensive and unsafe for large scale Li-ion Batteries. Recently lithium iron phosphate (LiFePO4) has been becoming the "best-choice" of materials in commercial Li-ion (and polymer) batteries for large capacity and high power applications, such as laptops, power tools, wheel chairs, e-bikes, e-cars and e-buses.

The LiFePO4 battery has hybrid characters: it is as safe as the lead-acid battery and as powerful as the lithium ion battery. bard wall ac units advantages of large format Li-ion (and polymer) batteries containing lithiumfree standing ac unit @ walmart iron phosphate (LiFePO4) are listed as below:wall unit ac 5000 btu 1. Conventional charging During the conventional lithium ion charging process, a conventional Li-ion Battery containing lithium iron phosphate (LiFePO4) needs two steps to be fully charged: step 1 uses constant current (CC) to reach about 60% State of Chargestep 2 takes place when charge voltage reaches 3.65V per cell, which is the upper limit of effective charging voltage. Turning from constant current

(CC) to constant voltage (CV) means that the charge current is limited by what the battery will accept at that voltage, so the charging current tapers down asymptotically, just as a capacitor charged through a resistor will reach the To put a clock to the process, step 1 (60%SOC) needs about one hour and the step 2 (40%SOC) needs another two hours. Because an overvoltage can be applied to the LiFePO4 battery without decomposing the electrolyte, it can be charged by only one step of CC to reach 95%SOC or be charged by CC+CV to get 100%SOC. This is similar to the way lead acid batteries are safely force charged. charging time will be about two hours. tolerance and safer performance A LiCoO2 battery has a very narrow overcharge tolerance, about 0.1V over the 4.2V per cell charging voltage plateau, which also the upper limit of the charge voltage. over 4.3V would either damage the battery performance, such as cycle life, or

result in fire or explosion. A LiFePO4 battery has a much wider overcharge tolerance of about 0.7V from its charging voltage plateau of 3.5V per cell. with a differential scanning calorimeter (DSC) the exothermic heat of the chemical reaction with electrolyte after overcharge is only 90 Joules/gram for LiFePO4 versus 1600 J/g for LiCoO2 . The greater the exothermic heat, the more vigorous the fire or explosion that can happen when the battery is abused. A LiFePO4 battery can be safely overcharged to 4.2 volts per cell, but higher voltages will start to break down the organicNevertheless, it is common to charge a 12 volt a 4-cell series pack with a lead acid battery charger. The maximum voltage of these chargers, whether AC powered, or using a car's alternator, is 14.4 volts. fine, but lead acid chargers will lower their voltage to 13.8 volts for the float charge, and so will usually terminate before the LiFe pack is at 100%.

For this reason a special LiFe charger is required to reliably get to 100% Due to the added safety factor, these packs are preferred for large capacity and high power applications. From the viewpoint of large overcharge tolerance and safety performance, a LiFePO4 battery is similar to a lead-acid battery. 3. Self balance   Unlike the lead-acid battery, a number of LiFePO4 cells in a battery pack in series connection cannot balance each other during charging process. the charge current stops flowing when the cell is full. This is why the LiFEPO4 packs need management boards. 4. Four times higher energy density than Lead-acid battery   Lead-acid battery is an aqueousThe single cell voltage is nominally 2V during discharge. heavy metal, its specific capacity is only 44Ah/kg. In comparison, the lithium iron phosphate (LiFePO4) cell is a non-aqueous system, having 3.2V as its nominal voltage during discharge. Its specific capacity is more than 145Ah/kg.