![]() 8D lithium batteries are a better replacement for lead-acid batteries for marine and large off-grid applications. Applications It can be used in emergency alarm systems, lighting systems, standby power, solar power, RV, etc. For high power requirements, it can replace several small lead-acid batteries. Advantage It works well in situations where emergency services are required and can withstand harsh climates. A typical 8D battery has more capacity than 4D batteries and has 230-330 amp-hours. Capacity A typical 4D battery has a capacity of 150-220 amp-hours. An 8D battery can provide cold-cranking amps of up to 1500. Cold-cranking amps A 4D battery can provide cold-cranking amps between 900-1300. An 8D battery typically weighs between 130-180 pounds. Weight A 4D battery weighs less than an 8D battery and is between 100-150 pounds. ![]() A typical 8D battery has a dimension of 21*11*10 (inches). ![]() Comparison Table Parameters of Comparison 4D Battery 8D Battery Dimension A typical 4D battery has a dimension of 21*9*10 (inches). The difference in discharge time will depend on the configuration and load.Some places where 8D batteries are extensively used are RV house batteries, medical applications, for powering industrial vehicles and machines, etc. In each case each battery will supply it's voltage times it's amp hour rating, 10V * 10Ah = 100Wh. In series with 20 ohm load it would be 20V * 1A * 10h = 200Wh In series with 10 ohm load, it would be 20V * 2A * 5h = 200Wh. If you connect them to a 20 ohm load so that the current is 1A the time will be 10 hours.įor a single battery into 10 ohms the power delivered would be 10V * 1A * 10h = 100Wh.įor the parallel case, the power delivered to a 10 ohm load would be 10V * 1A * 20h = 200Wh. ![]() If you connect them to the same 10 ohm load the current will be 2A. If you connect two of them in parallel the voltage will remain the same, so connected to the 10 ohm load the current will still be 1A, but each battery will be providing half of that, or 500mA. If you connect one battery to a 10 ohm load the current will be 1A (10V / 10 ohms), so theoretically it would last for 10 hours. Suppose you have two 10V batteries, each with a rating with 10Ah. In this example I'm going to assume an ideal world just to make the math easy, real batteries will behave differently. \$I_S=2I\$ that the capacity of serial bank battery Since \$Ri\$ and \$ U_ \approx U1 U2 =2V\$ that's consistent let moreover R the a test / load resistance. That our battery V has small internal resistence Setting: to apply Kirchhoff laws we should assume while the addition of voltages results as an immediate consequence, I not see how I can conclude from consideration below the prediction that the capacity of the two batteries in series is the same as for single battery. I prepared some calculations in order do derive the predicted rule of thumb for the series case based on elementary Voltage \$Y \$, but twice as big capacity \$2X \$ parallel, then the "composed" battery has same series, the "composed" battery twice as big Two batteries of same type (Y V, X Ah) in Same capacity, say 12V and 100Ah) parallel.Ī usual rule of thumb says that if with connect Two batteries of same type (ie of same voltage and
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