Lithium Battery Question
2016-07-15WSTANDARDUSA INC
■Does the Lithium Battery could Jump start? What situation does the Lithium Batterycould Jump start?
Answer:Jump start is the emergency start way whichdivide into 2 status: 1、Lithium battery connects acid battery for starting;2、Acid battery connects lithium battery for starting. Nomatter what kind of status, it’s just only used for emergency initiation. It’snot a normal way and it’s dangerous for battery and motor electrical system.Before jump start, the battery should be over discharge and not failure (Thebattery is equivalent to large capacitance in the circuit which plays a role offiltering and regulation). Jump starts the motor with high battery and looses itin time after starting.
■The Lithium Battery could not be charged if the motorcycle only starts but doesn’trun, is it right?
Answer:The motor idle speed start is usually 1200RPM－1400RPM;The magneto power is low, the rectifier output voltage is 13.5－13.8V.Lithium Iron Phosphate discharge average power is 13.35V. The potential isalmost the same so the charge efficiency is not high. Charge is workable. Thebattery maintenance way usually takes a small current charging motor forcompensating its self-power consumption after starting. The starting timedepends. Longer the charging time, the more the charging power.
■How long does the motorcycle need to run to enough to charge the battery andkeep in storage if the riders haven’t started their motorcycle for 3 month? Forexample, how far or how long does it run?
Answer:The charge capacity should be defined by theproduct of current and time. E.g. Acid battery YTX9－BSand the corresponding lithium battery WEX2R12 could be replaced. The samecharging current I＝3A（Ampere）and takes 1H as theunits: Charge Capacity C＝I*H, that’s to say, it can be charged thecapacity 3AH. Considering the charge loss rate is about 20%, the actual chargecapacity is not less 2.4AH. If the motor consumed 2.4AH within 3 month then itcan back charging well.
PS: The acid batterymonthly self-power consumption rate is 5－8%, the lithium batterymonthly self-power consumption rate is about 1－3%. Selfstatic state current and leakage should be considered.
■How long does the motorcycle keep in storage and don’t need to start for drive ifwe install the Lithium Battery in the big-sized Motorcycle? Like HarleyDavidson and Superbike-Kawasaki, Yamaha, Honda. As clients can’t test thevoltage in current market, could we also understand that it definitely can be startedif the battery voltage is enough to start 3 times?
Answer:Same with above problem attribute.
■Does the Lithium battery loose power if we always drive the motorcycle in shortdistance? How to maintain the Lithium Battery? (Usually, the final users don’thave the charger)
Answer:Same with above problem attribute. Thenormal battery maintenance way is to take a corresponding charger whichcompensates the power through a small current in 1-2 month. In this way thebattery life will be longer.
■Is it all right if we always charge the Lithium Battery by fast current?
Answer:Lithium battery charge current could be more thanacid battery. The maximum charge current for lithium battery could be accepted3C (C means the battery standard capacity) current, but acid battery maximum currentis only 0.5C. It’s no harmful for battery only if it’s no more than the maximumcharging current in the manual.
Charge the battery witha small current for maintenance advised.
■How many kind of starting lithium battery does have in the current market? Whatis the Lithium Iron Phosphate advantage in comparison with the other type ofLithium material in the market?
Answer:The differences of lithium battery is mainly the cathode material:there is mainly cobalt acid lithium materials (LiCoO2), Lithium Manganate（LiMn2O4）,MnNiCo ternary and lithium iron phosphate（LiFePO4）; (Ternarylithium battery means that the cathode material was made from lithium, nickel,cobalt and manganese); Motor electrical design is for the 12V battery from thematching of security and voltage. It's most suitable that Lithium ironphosphate (LiFePO4) is using 4S 12.8V. High-and low-temperature resistantdischarge properties are also good.
■How to prove the stability of electrical discharge of Lithium Battery is muchbetter than the Lea-Acid Battery? How to present?
Answer:The characteristic of batteries dischargemainly presented the comparison of discharge curves. Lithium battery dischargeis smooth and the platform of discharge is flat. Below is the comparison of discharge curves between lithium battery and Lea-AcidBattery.
Lithium battery：
Lea-Acid Battery：
For details, see discharge curves contrastdata and charts
■Does our Lithium Battery have the short-circuit protection?
Answer:Lithium battery short-circuit itself is illegaloperation, direct short-circuit would be caused instant high current throughbattery, internal heat and pressure, and then damage the battery and personalinjury, so the direct short - connected positive and negative electrode of lithiumbattery is banned.
■Did the successful underwater test prove our lithium battery can start in thewater? Many customers asked us why it didn’t short circuit in the water.
Answer:Water test takes the purified water as thecarrier which just proves the lithium battery package water-proof but notshowing the underwater usage. Thedeionized-water and distilled water are not insulated and can't conductelectricity.
■Does the normal charger could charge the Lithium Battery without any damage?Except De-Sulfate, is there anything we need to pay attention? Does De-Sulfate couldcertainly show on the charger? Why does SHORAI designate to use De-Sulfacecharger?
Answer:“De-Sulfate”mode is used for Lea-Acid Battery recovery mode. Thesurface of the inner plate of the battery is adhered with a layer of white hardcrystals. It still can't peel off the lead sulfate of active substance which wasconverted from crystals after charging, this is vitriolization of Lea-AcidBattery.
The kind of charger withde-curing mode would damage the internal structure of the lithium battery, andthen break down the lithium battery, that’s absolutely prohibited.
W－STANDARD recommendsto use “MCU－4－2”, aspecial matching charger which is more helpful for prolong the service life oflithium battery.
■How long will the lithium battery has quality issues if it kept in thewarehouse?
Answer:Thelithium battery power is 90% before they leave the factoryand self discharge rate is 1% please compensate the battery power if kept in storagefor 10 months.
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