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SurePower and SurePower II Lithium Ion Defibrillator Battery Update Jan 2012

Update

4 Pages

Updated 1/24/12 SurePower and SurePower II (Lithium Ion) Defibrillator Battery Introduction Lithium Ion chemistry provides the highest energy density to date versus other available chemistries such as NiCd, NiMH, and lead acid. This means lighter smaller batteries that will provide longer runs times versus comparable size batteries of the previous chemistries stated earlier. Battery Capacity versus Run Time Run time and the battery’s capacity are not the same thing. Capacity is how much energy is stored in the battery where Run Time is how long that capacity (stored energy) can power a given platform. One can think of capacity as the number of gallons contained in a gas tank and Run Time being how many miles one can drive using those gallons. Each platform (E Series, R Series, Propaq, X Series, and AED Pro) will have different run times depending on what parameters are operating (EtCO2, SpO2, NIBP etc.) at any one time and the mode of operation (Monitor, Pace or Defib). The parameters running and the operational mode affect how much current is draining from the battery. SurePower Battery Charging and Recalibration Charging: The SurePower Charger will provide the fastest charging time versus recharging a battery in the platform. The longest charging time will occur in the platform while the platform is ON because only a small portion of the AC Charger output current is used to recharge the battery. A depleted SurePower battery will take >12 hours to recharge in an E Series or R Series while ON and approximately 4 hours (R Series, X Series and Propaq) and 6 hours (E Series) when OFF at room temperature. Please note that the battery may not always display 5 Run Time LED’s (fully charged) after recharging in the platform to the times just previously stated. If this does occur the battery will be >90% charged even though the 5 th LED does not illuminate. The SurePower Charger will reliably recharge the battery to FULL and show 5 Run Time LED’s when the battery Display button is pressed. Note: AED Pro does not have the ability to recharge a battery, must use the SurePower Charger How to recalibrate: The only way to ensure a successful recalibration of the battery is to place the battery into a SurePower Charger and press the Manual Test button on the charger. The Manual Test cycle can take up to 10 hours to complete with a fully depleted battery. How often: The Recalibration “?” LED will illuminate if 1 year of elapsed time or 500Ah of discharge throughput has occurred since its last recalibration. To clear the Recalibration “?” LED, the user must press the Manual Test button on the SurePower Charger. The latest battery software (SurePower V1.80, SurePower II V1.50) will automatically start a Manual Test cycle but there are many batteries in the field at previous software revisions so pressing the Manual Test button should always be done. To maintain the highest accuracy the battery should be recalibrated every 1 or 2 months. Notes: 1. The SurePower battery cannot be recalibrated in any platform (E Series, R Series, X Series, Propaq, or AED Pro). The platforms do not drain the battery low enough to perform a recalibration. The reason is the battery does not fully deplete when “Replace Battery” is indicated in order to have a small reserve left so if the battery is unintentionally not recharged right away, no battery damage will result from too low a cell voltage. Recharging must occur within: - 45 days maximum for E Series - 30 days maximum for R Series and AED Pro - 14 days maximum for Propaq and X Series 2. The SurePower Battery and Charger were intended to automatically recalibrate the SurePower battery when needed. Unfortunately this feature is not always reliable. The battery software was been updated to fix this problem but most of the SurePower batteries currently in the field will have this potential recalibration issue. Therefore to insure a recalibration takes place, the Manual Test button on the SurePower Charger must be pressed. Revision A of the SurePower Battery Pack Guide (9650-0536-01) is incorrect on page 5: • Draining a fully charged SurePower battery in the defib will NOT recalibrate the battery. This was corrected in Revision B of the SurePower Battery Pack Guide. Run Time LED Operation The battery will display run time (per the Run Time LED display) automatically whenever current is flowing either charge or discharge except for X Series and Propaq which will always require a button press to display the green Run Time LED’s. During discharge, Run Time is determined from the actual current being drawn from the battery. If no load current is flowing (or if the battery is not in a platform) and the Display button is pressed, the run time displayed is based on a default discharge current value. The default current is 2A for SurePower and 1.2A for SurePower II batteries. Notes: 1. One could see two Run Time LED’s illuminated, for example, via a Display button press but then see three Run Time LED’s when the battery is being used in a platform. This will be due to the platform load current being less than the default value. Again the Run Time display will always show remaining run time based on the actual load current flowing when powering any platform. 2. With battery software versions V1.80 (SurePower) and V1.50 (Propaq/SurePower II), the battery will use the default current value to determine run time for the first minute of operation to prevent incorrect Run Time indication during that first minute. This allows time for the gas gauge Average Current value to reach its actual operational value. The battery LED Run Time display will activate (illuminate) within 15 seconds after the platform is switched on except for X Series and Propaq (need to push the button on the battery for a Run Time display). Battery insertion into an AED Pro starts the “Battery Insertion Test” after which time the AED Pro turns off. The battery test will not activate the SurePower battery Run Time display but pressing the ON button of the AED Pro with a battery already installed (Green “√” displayed) will, again within approximately 15 seconds. Run Time that is displayed while charging is determined by the battery using the default discharge current value so Run Time is based on the default current drain which is conservative versus the actual platform current draw. One blinking Run Time LED indicates less than 15 minutes of available run time. To be safe the battery should be recharged as soon as possible. Battery and Charger Fault Indications Faults reported by the charger do not necessarily indicate there is a problem with the battery. The most common cause for charger faults is a communication error between the charger and battery with a higher occurrence with the Propaq battery because of the added charger adapter. If a charger fault occurs, press the battery status button to determine if the battery also has a fault and if not reinsert the battery into the charger to try charging again. Note: SurePower Battery software V1.50 and Propaq battery software V1.10 have a bug that causes the charger to sometimes fault on a charge/discharge or discharge/charge transition during a Manual Test cycle. Reinserting the battery back into the charger clears the fault (press the Manual Test button again) and should complete successfully. Platform “Low Battery” and “Replace Battery” Determination All platforms use Remaining Capacity read from the battery to determine when to post “Low Battery” or “Replace Battery”. Voltage is only used as a backup in the event communication is lost between the battery and platform. The voltage thresholds were chosen so the Remaining Capacity thresholds will be reached before the voltage threshold if the battery is properly calibrated. If a battery is depleted in the platform (i.e. used until platform shuts off) the battery must be recharged within the time specified below in order to prevent the battery from generating a permanent battery disable fault due to excessive low cell voltage. Recharging must occur within: • 45 days maximum for E Series • 30 days maximum for R Series and AED Pro • 14 days maximum for X Series and Propaq Long Term Storage of the SurePower and SurePower II Battery If SurePower or SurePower II batteries are to be stored for >90 days: • Do not store in the platform • Do not store fully charged, this only accelerates aging of the battery. Batteries should be charged till 3 Run Time LED’s are illuminated (1:00+ for SurePower, 2:00+ for SurePower II) prior to storage or use a Conditioning Charger to recharge batteries prior to storage. • Storage temperature should be between +15°C and +25°C (temperatures >+25°C increases self discharge and also accelerates battery aging) • Recharge back to 3 Run Time LED’s every 4 months • Do not store depleted batteries or damage will result (the battery pack will permanently disable itself if the battery voltage decays to a predetermined low value for safety reasons. When this occurs, the battery Fault LED will illuminate upon a button press and the battery will generate a charger fault when placed into a SurePower Charger for that specific battery bay only.) Expected SurePower Battery Life Expected cycle life of the SurePower battery is approximately 700 cycles in hospital and EMS heavy use applications and greater than 700 cycles in light use applications. Light versus heavy simply means the pack is ~30% drained per cycle before recharge for light use and completely drained per cycle for heavy use. This number will change due to actual customer usage patterns but 700 cycles is a typical number for heavy use. A “Shift Check” protocol was tested and found not to be detrimental to the SurePower battery (reduction of pack capacity) as was found with lead acid over extended periods. Another difference of lithium ion cells versus lead acid is that lithium ion batteries will not improve in capacity with repeated deep discharge cycles as with lead acid. Lithium Ion chemistry does not suffer from “memory effect” as nickel based chemistries do. AED Pro Disposable Battery There are no maintenance requirements for this battery other than: • Battery must be used prior to the “Install Before” date located on the back label • Batteries should be stored at a temperature between +15°C and +25°C to minimize cell self discharge ZOLL Battery Warranty One year warranty for all Rechargeable Batteries (SLA and Lithium) sold in the USA and internationally.
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File Name: SurePower and SurePower II Lithium Ion Defibrillator Battery Update Jan 2012.pdf
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