12/4/2011, We started learning about car batteries and how they work, why they work the way they do and what are the dangers of a battery. i think we all have thought about what will happen if we connect negative to postive and positive to negative, will the battery blow up ?. i've learnt it may blow up or it will blow the fuse, but its not the best test you will wana do, because a car battery is 34% sulphuric acid and 66% distilled water and is knowen as electrolyte. cloths and acid dont go very well together neither does skin and acid,So car battery is quite dangerous if we dont respect the manner its made to be used in.everyone thinks a car battery stores electricity but it stores chemical which produce electrons.when the car is not started the battery keeps the car computors alive and keeping the memory alive.sometime the battery might be to small or old and it wont be able to do everything its made to do,thier are two types of batteries one is a primary cell, its a everyday use battery exmaple the one you use in torchs and stuff and it can not be recharged once its discharged, but the car batteries are secondary cells which can be recharged once thier are discharged,Batteries have vent caps to let the gas out because batteries cause hydrogen,when a battery is discharged the water level inside the battery raises and the acid level drops, But when the battery is charged again the acid level raises and the water level drops.
COLD CRANKING AMPS AND CRANKING AMPS,
Cold cranking amps is the ability of a battery to deliver a specified current at -18.c for 30 seconds without voltage of each cell of the battery falling below 1.2volts.
RESERVE CAPACITY,
Is the time in minutes a fully charged battery will supply a constant load of 25 amps, without the voltage falling below 10.5volts,
AMPERE HOUR (A/H)
Is the amount of current a fully charged battery can deliver for 20 hours without the battery voltage falling below 10.5volts.
