![]() ![]() Conversely the lower the drain, the more efficient the battery is.īecause of this characteristic, you have to be on the lookout for under handed manufacturers who might try to pull the wool over your eyes. ![]() The higher the rate of discharge, the higher the internal resistance inside the cells and the more energy that is wasted in heat. right? Wrong! The amp hour rating is usually given at something called the “20 hour rate” so a 100Ah battery can power a 5 amp appliance for 20 hours ( 5 amps x 20 hours = 100).Ĭonnected to a 100 Amp appliance, the same battery might only last a matter of minutes. So a 100Ah battery should power a 100 Amp appliance for one hour …. STEP TWO: Understanding the amp hour rating When it comes to purchasing a deep cycle battery, this is one of those times when purchasing a well recognized brand is well worth the slightly higher cost. Price – if it is too good to be true, it probably isn’t the thicker plate!.Weight – lead is heavy, if there is a weight difference between two identically rated batteries the lighter one is probably skimping on lead.Unfortunately, it is not possible to open up batteries and measure plate thickness, but there are two giveaways: The battery may short out or it will just last for shorter and shorter periods requiring a replacement purchase long before it should be necessary. The active paste applied to the plates will also be dislodged at a higher rate as it is not designed to go below a 50% state of charge. You may not notice the difference at first but after a few charges and discharges the thin plates inside will start to buckle. Starter batteries use less lead (the main cost in the production process) because the plates in the cell are thinner. This has allowed some less reputable manufacturers to label starter batteries as deep cycle – especially in the lead acid battery arena. There is very little regulation, let alone monitoring, of the deep cycle battery market. STEP ONE: Make sure it really is a deep cycle battery ( Video of What makes a Deep Cycle Battery Different with Transcript) This article deals mainly with lead acid batteries and makes reference to the internal design – you can find out more about this in the article What is a lead acid battery? Here we’ll cover the steps you can follow to find the right battery for your needs. There is a great deal of misunderstanding that surrounds deep cycle batteries, which often leads to extra costs as buyers follow false economies. Thin plates (used in starter batteries) buckle under these circumstances causing the battery to short out or limiting its ability to recharge. Some models even have completely different plate designs to add even greater strength. Deep cycle batteries have much thicker lead plates to withstand long and intense discharging. This is true of flooded lead acid and sealed lead acid batteries. ![]() It is lead acid batteries than can be ‘cranking’ (designed to deliver short bursts of high energy) or deep cycle. Some battery types, such as lithium ion batteries, are only deep cycle and so are not labelled as such. Deep cycle batteries (also often called Leisure or Marine batteries) are designed to provide a constant current over several hours compared to starter batteries which offer high power for several seconds. ![]()
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