Turns out that under load the converter output drops down from the no-load 14.6V. Motobatt batteries are electronically sealed and can bear the occasional submerging for short periods. A LiFePO4 battery uses the same constant current and constant voltage stages as the SLA battery. If voltage drops you may need to put it back on the charger again if it has been deeply discharged prior. Q. I saw a load of about 750mA and I let the voltage drop down to 10.9V. Drop-In LiFePo4 – Important Issues to Consider: #1 BMS Current Handling ... You also don’t want to adjust your power supply voltage while it is under load. Doing so will VOID YOUR WARRANTY, Expose your Lithium battery to a heat source or dispose of in a fire. A fully charged lifepo4 cell will have a resting voltage of just over 3.3v. Motobatt Lithium batteries can provide up to 1000 cycles vs around 500 for quality lead acid types. The charger is also a maintainer and can be left on 24/7 so you are ready to ride. Doing so will VOID YOUR WARRANTY, Never spray Paint or any other coating over your Lithium battery. LiFePO4 batteries provide much higher specific capacity, superior thermal and chemical stability, enhanced safety, improved cost performance, enhanced charge and discharge rates, compact size, light weight, and enhanced cycle life. Measuring the voltage drop across a connection under load is tricky in a car, more tricky when there are 50 of them to do. Many manufacturers spin between CCA and CA when referring to their products advantages. Most older lead acid automatic chargers do not put out high enough voltage to charge a lithium battery fully, so this should only be a go to in an emergency. A broken ground wire totally blocks current flow, shuts off the load and causes the ground side of the load to read system voltage. However you don't want to keep them constantly charged and not used at 100% full. It then drops to its nominal full voltage... Jul 16, 2016, 02:25 PM. This is inferior cell control since the only time the cells are properly controlled and balanced is when connected to a wall socket. I also explain voltage drop when using wires that are too thin. Digging In. Any idea what the under-load voltage during this flat period would be? Again, this is because because there will be voltage drop between the batteries and power supply. If your willing for each cell to sag to 1.7vpc under the 300A peak load (even if fully charged) you can get away with 40AH cells. For a Lithium to wake up from its cold slumber you should put some sort of drain on the battery to warm it up such as turning on your headlight or some other load. Yes and no depending on your level of competence in monitoring the battery whilst charging. Lead-acid battery chargers may only be used if they have an automatic cut off and no Desulphating or “Pulse mode of charging. Never use a standard constant voltage battery charger! It’s not all bad though, generally after 5 minutes or so you will achieve a cold start with a load on. One measurement I have is 45A into the battery at 13.85V, but I don’t know the state of charge. Designed to reduce the threat of thermal runaway, premature battery failure, and unnecessary consumer warranty. Q. It is also why the battery will not handle current loss to constant power loads like accessories because it’s all or nothing so to speak. I hear lots of discussion about LifePo4 high charge rates at a given charge voltage, but very little discussion about discharge voltage while under heavy load. It’s the combination of Voltage (the force in which the power is delivered and Amperage (how much current) to create enough Watts (the end energy result) to start engines that is key. Further it’s impossible to turn on the headlight because the engine isn’t running. Motobatt Quadflex AGM line design is based around the same principles of having more Amp Hour to support a higher voltage number at start-up to produce enough Watts to start the machine for longer. What CCA should I be looking for when choosing my Lithium battery? I noticed that the use of LIFE Bats is not mentioned for servos in the above discussion . But, at under minus 6 degrees Celsius and below, Lithium batteries struggle to work. Electrical voltage drop varies according to current flow. Yes, drop down to 3.3v / per cell quickly, then stay there for about 80% of the capacity, then starts to drop off quickly (LAND!). You may damage your battery and in addition cause the battery to catch fire or become unsafe. As the user, it us your responsibility to keep the battery in good condition to ensure long hassle-free life. Lithium LifePO4 Powersports batteries are a relatively new technology being introduced to the market. The Voltage drop is less for a longer period. Is there something I missing here? The industry Lead Acid standard load test on a carbon pile tester is 50% of “rated” CCA for 10 seconds, since 100% of CCA is never available from any battery. Lithium starting batteries generally lack Amp Hour capacity and are not suitable for applications where high power loads are placed on the battery. Most of us don’t like to go full submarine mode when our dirt riding, but we all have that one friend with stumpy legs…. No shimming with bits of foam and making a mess of your battery compartment. They can be charged from flat to operational within 10 minutes, and fully charged in around 2 hours. Late model Fuel Injected Powersports vehicles draw power from the battery parasitically when the ignition is off. This gives you a false voltage reading. Under the intense heat of the load, one or more of the weld pieces connecting the cells is coming loose and separating. A. Motobatt Lithium Pro HP Series batteries should be recharged whenever voltage is found at 13.1 Volts or less.The ideal rate to charge at is around 2 amps.At no time exceed this limit. The voltage drop was more than I expected for a 2,560 watt capable battery. They are lighter in weight, and can save space for custom applications. Lithium prefers to be at 90%-94% and stored at 50%-70% full. Q. But as soon as the load goes away, that 13.20 volts comes back instantly. Many competitors require you to buy their specific charger at a high cost because the CBC is in the charger, not the battery itself. In the case of lead acid types pulse discharge amps drop from 12.85V to around 9.5V within around 10 seconds and to about 7.5V after 15 seconds. Never use contact cleaners to clean your battery. A. Lithium batteries create a lot of CA (Cranking Amps) per size over lead acid types; however, CA is a different test to CCA (Cold Cranking Amps) which is the industry measure at 0 degrees Celsius. Because of the power involved, most electrical issues will show up as heat. Always disconnect the battery from the machine when not it use if you do not have a Lithium ready Maintenance charger. The battery recovered to 11.098v. Charging at 14.4 charges them quickly and then you want to drop in to basically a float voltage … There was little to no voltage drop until current reached a 20-30a threshold. Important Note:Before using a Motobatt Lithium Pro HP battery it is important to understand the Amp draw on start-up of your vehicle in all conditions, then match that to the correct battery. #3. Q. What should my fully charged Voltage be? Motobatt Pro Lithium batteries are a high performance racing battery designed to produce high cranking currents for short burst periods. Older Carburetted Powersports vehicles generally have little or no draw on the battery when the key is in the OFF position, so your battery may last 6 months to a year in this situation, however it is always best to disconnect the battery from the machine if you are not sure. A. Yes, you can charge your batteries up to 14.4 to 14.6V. You should check to see that the battery you are buying has enough constant Amperage to get the job done. CCA is not the only prerequisite of a battery. To summarize this, a bulk/absorb setting between 14.2 and 14.6 Volt will work great for LiFePO4! In most cases I waited until the current dropped to below 30mA. 3. It also depends on how much voltage sag is acceptable. Once under 8V the battery can be permanently damaged. Simply recharge with your Motobatt PDC Fatboy charger and you are good to go. It sounds like you have your solar charging running and you plugged in … Applying the typical 15 to 20 amps from a modern 100 watt radio, we experience a significant voltage drop. It is important to note that Lithium does not perform as well as lead acid in low temperatures, and these are two different measurements. The ECU, Alarm, Clocks, and in many cases performance ECU will drain your battery, and with lithium, FAST. Around 14.0 to 14.5 volts is actively charging. Since mostly it is off road riders opting for Lithium, this is a bad day when you have no kickstart option as many late model bikes don’t. The voltage drop is definitely not linear (vs. increase in current). You should charge the battery every ride to ensure voltage is maintained and cells are well balanced. During the conventional lithium ion charging process, a conventional Li-ion … LiFePO4 battery packs are identified by the pack voltage and capacity.
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