However in the first case you will have to watch the four cells individually. So you only need to watch the 2 pairs of cells.
Because the pairs of parallel cells will be automatically balanced and at the same voltage.
BATTERY STATUS IN PARALLEL CONNECTION SERIES
Laptop batteries commonly have four 3.6V Li-ion cells in series to achieve a nominal voltage 14.4V and two in parallel to boost the capacity from 2,400mAh to 4,800mAh. Some packs may consist of a combination of series and parallel connections. In the case of lithium battery, the second one is preferable. Parallel connection attains higher capacity by adding up the total ampere-hour (Ah). That's why a Battery Management System (BMS) of a lithium cell battery will monitor each voltage to balance them safely. Simply, connect both of the batteries in parallel where the overall battery capacity would be 400Ah and the same voltage level i.e. It is generally not a problem for some technologies like NiMH, however for lithium-based cells an overdischarge is highly dangerous. A technician could 'pull the guide up' for technicalities such as variables in cable length etc. Configuration: 4 x 12V 60Ah connected in parallel and then in series 24V 120Ah output. We often use 4 x 12V batteries in series to make a 48V Battery.
But batteries connect in series, to make a higher voltage, must all be the same size capacity. Connecting Batteries in series, increases the Voltage, each battery voltage added together. If you start using cells in series with different initial states of charge, there is a risk that a cell goes empty before the others (and one may become critically empty whereas the others are ok). By joining two battery banks (already linked in parallel) and connecting them in series, we increase the battery banks voltage and Ampere-hours. Connecting Batteries in parallel simply increases the capacity, the Ah. However cells are always a little bit different. In the second one you double capacity and then add the voltage. In the first case you first add the voltage and then double the capacity (assuming the cells are identical). Theoretically, if all cells are identical, no. I would expect the likelihood of this with batteries like 9 V, but with car batteries or submarine batteries, it would be more of a concern.Is there any difference regarding end voltage/capacity ? I that situation the bad battery might just ruin the other batteries, but in extreme cases the good batteries could dump enough energy into the failed battery to cause a melt or a fire.
This may or may not be a major issue, but will likely at least result in the effective mAh value for the ensemble being less than it would if they were truly matched.Īs for leaving them connected in storage - in theory, it shouldn't matter, but again in practice it might make a slight difference in most cases and a big difference in cases where one battery goes bad. Try not to mix batteries from different manufactures or even different product lines from the same manufacturers since the discharge characteristics will be somewhat different.
This includes being the same same state of charge (which, in practice, means that they are new, otherwise you have no idea what the individual states of charge are. As already noted, the batteries should be as identical as possible.
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