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Odyssey Battery Application Manual - Dali Racing

Odyssey Battery Application Manual - Dali Racing

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(B) How long can the battery be stored?The graph below shows the shelf life of the ODYSSEYbattery at different temperatures. At 25°C (77ºF), thesebatteries can be stored for up to 2 years. The lower thetemperature, the longer the storage time. Charge thebattery before storing it.The effect of temperature on storage is evident. Roughly,every 10°C (18°F) increase in temperature cuts thestorage time in half. Thus, at 35°C (95°F) the battery maybe stored for only 1 year before a recharge becomesnecessary.Figure 3 applies only to batteries that are fully chargedbefore storage.Figure 3: ODYSSEY storage time at temperatures1009025C 45C 65CThese test results prove that ODYSSEY batteries canrecover from abusive storage conditions. Reinforcing thisconclusion is the next test, which is even harsher thanthe DIN standard test, because in this test the batterywas stored in a discharged state at a temperature of 50°C(122°F).(2) High temperature discharged storage testTwo PC1200 samples were discharged in this test at the1-hour rate to 9V per module, and then placed in storageat 50°C (122°F) in a discharged condition for 4 weeks.At the end of 4 weeks, the two batteries were rechargedusing a constant voltage (CV) charge at 14.7V per battery.As Figure 4 below shows, both samples recovered fromthis extreme case of abusive storage.Figure 4: Recovery from high temperature dischargedstorage36Constant voltage recharge at 14.7V per module8034Percent of 0.05C capacity706050Capacity at the 1-hr rate3230282624Sample 1 Sample 2Current limit for cycles 1 & 2 : 0.125C10Current limit for cycles 3 - 16 : 1C10402230010 20 30 40 50 60 70Open circuit storage time in weeks200 2 4 6 8 10 12 14 16 18Cycle number(C) Can the battery recover from abusive storageconditions?Yes, the ODYSSEY battery can recover from extremelydeep discharges as the following test resultsdemonstrate.(1) German DIN standard test for overdischarge recoveryIn this test, a PC925 was discharged over 20 hours(0.05C10 rate) to 10.20V. After the discharge 2 a 5Ω resistorwas placed across the battery terminals and the batterykept in storage for 28 days.Low temperature performanceExcellent low temperature performance is anotherfeature that sets the ODYSSEY battery apart from theothers. Figure 5 below shows that at -30ºC (-22ºF) thebattery will deliver as much as 40% of its 15-minuterating.Figure 5: ODYSSEY capacity at temperatures1015 min. rate 1C rate 0.2C rateAt the end of the storage period, the battery was chargedat 13.5V for only 48 hours. A second 0.05C10 dischargeyielded 97% of rated capacity, indicating that a low rate48-hour charge after such a deep discharge wasinsufficient; however, the intent of the test is todetermine if the battery is recoverable from extremelydeep discharges using only a standby float charger.A standard automotive charger at 14.4V would haveallowed the battery to recover greater than 97% of itscapacity.Discharge time, hours10.10.01-40-30 -20 -10 0 10 20 30 40Temperature, C2 The C10 rate of charge or discharge current in amperes is numerically equal to the rated capacity of a battery in amperehoursat the 10-hour rate. Thus, a 26Ah battery at the 10-hour rate, such as the PC925 would have a C10 rate of 2.6A.10 www.odysseyfactory.comPublication No: US-ODY-AM-001 - April 2006

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