The Nominal or Rated capacity of a battery (in Ah) is defined as the maximum Ah a fully charged battery can deliver under certain specified conditions. These conditions include: • the voltage to which the battery is discharged (the end voltage), •
They're rated down to an end point of 10.5 volts. By then, lights get dim and TV picture small. A Specific Gravity of about 1.200 or a voltage of 12.25 to 12.3 means the battery is about 50% discharged. By the time it's down to 11.8 or 12 volts, it's almost dead.
4 Depth of Discharge and State of Charge. Depth of Discharge (DOD) is the fraction or percentage of the capacity which has been removed from the fully charged battery. This simply means that the battery can produce more than 100% of its nominal capacity at discharge rates lower than the nominal rate.
4: Avoid completely discharging lithium-ion batteries
If a lithium-ion battery is discharged below 2.5 volts per cell, a safety circuit built into the battery opens and the battery appears to be dead. The original charger will be of no use.The cycle life is the number of complete charge/discharge cycles that the battery is able to support before that its capacity falls under 80% of it's original capacity. Generally cycle life means the number of charge/recharge cycles before a battery starts to reduce visibly its performance.
Automotive batteries will generally fail after 30-150 deep cycles if deep cycled, while they may last for thousands of cycles in normal starting use (2-5% discharge). Deep cycle batteries are designed to be discharged down as much as 80% time after time and have much thicker plates.
If the battery specs mention "starting", or " cranking" or list a CCA (Cold Cranking Amps) number, then it is surely not a deep cycle battery. At best it is a cranking/cycle performance hybrid. That is often seen in marine batteries which are expected to power running lights and accessories when the engine is off too.
If your battery shows a good voltage when it's fully charged, but quickly drops voltage to 11V or less when using power, this usually means the battery has a faulty cell and needs replacement. When a deep cycle battery is fully discharged (dead flat), it should reveal a reading of approximately 10.5V.
Modern devices use Lithium Ion batteries, which work differently and have no memory effect. In fact, completely discharging a Li-ion battery is bad for it. You should try to perform shallow discharges — discharge the battery to something like 40-70% before recharging it, for example.
The vast majority of deep cycle batteries on the market today are lead acid batteries. Lead acid batteries are recycled 98% by volume, 99.5% by weight.
Typically, a deep cycle battery will have two or three times the RC of a car battery, but will deliver one-half or three-quarters the CCAs. In addition, a deep cycle battery can withstand several hundred total discharge/recharge cycles, while a car battery is not designed to be totally discharged.
A deep cycle marine battery, or trolling battery, has several design differences. One key is plates: It has fewer, thicker plates allowing the battery to provide continuous power output over long time periods. Deep cycle batteries can be entirely drained and recharged many times over, cranking batteries can't.
The key is to use the watts you know to calculate the amps at the battery voltage . For example, say you want to run a 250 watt 110VAC light bulb from an inverter for 5 hours. Amp-hours (at 12 volts) = watt-hours / 12 volts = 1470 / 12 = 122.5 amp-hours.
As long as the battery that you are substituting is the same voltage, you can use a higher capacity (higher Ah) battery than the original one. The reverse is also true. Using a battery with a higher Ah will improve the device's running time on a single charge.
The charging/discharging rates affect the rated battery capacity. If the battery is being discharged very quickly (i.e., the discharge current is high), then the amount of energy that can be extracted from the battery is reduced and the battery capacity is lower.
in storage. When a battery has been unused for 6 months, check the charge status and charge or dispose of the battery as appropriate. The typical estimated life of a Lithium-Ion battery is about two to three years or 300 to 500 charge cycles, whichever occurs first.
