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Join Date: Aug 2008
Location: S_a_n_t_a C_l_a_r_i_t_a , C_A 9_1_3_5_5
Re: Odyssey or Optima Battery upgrade??
Lithium-Iron Powersports battery, 18 ah 12V eq, "L" polarity, Case Type 1
Length: 5.83", Heighth: 4.13", Width: 2.60" Fits Polaris RZR.
Battery weighs only 2.19 lbs ! 13 Pounds lighter than the stock battery.
*No more dead batteries. Holds charge for one year without maintenance.
Voltage (V): 12
A/Hr PbEq: 18
Cranking CCA (A): 270
Weight (lbs.): 2.19
Max Charge (A): 18
*2 to 4 times the service life of lead-acid batteries.
*Faster cranking for better starts.
*SAFE – No explosive gasses during charge, no lead, no acid.
Although small capacity Li-ion (polymer) Battery containing lithium cobalt oxide (LiCoO2) 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. The advantages of large format Li-ion (and polymer) batteries containing lithium iron phosphate (LiFePO4) are listed as below:
1. Fast "forced" charging:
During the charging process, a conventional Li-ion Battery containing lithium cobalt oxide (LiCoO2) needs two steps to be fully charged: step 1 uses constant current (CC) to get 60% State of Charge (SOC); step 2 takes place when charge voltage reaches 4.2V per cell, which is the upper limit of safe 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. To put a clock to the process, step 1 (60%SOC) needs a minimum of two hours and the step 2 (40%SOC) needs another two hours. Because an overvoltage can be applied to the LiFePO4 battery 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. The minimum total charging time will be about two hours.
2. Large overcharge 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. Continuous charging 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. When measured 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 up to 30V without protection circuit board. It is therefore suitable 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.
2010 Class 2 Champion -World Off Road Champion Series - UTV #515