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Author Topic: How to select suitable Battery for my robot ?  (Read 9728 times)
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« on: September 26, 2010, 12:52:47 AM »


How to select suitable Battery for my robot ? -Here are few tips

 First calculate the total current on full load (in running condition of your robot)
say for example it draws 500mA, then a 700mAH Battery will ideally give backup for 1hrs 15 Min or roughly in practical 1 Hrs, then after it will not stop working immediately but the rated voltage fill fall moderately -fast  

It is very important that the measured current of boat in full load (Running condetion and all associated mechanism in operation)

Generally any standard geared motor takes 80-100 mA at 12V but in load conditions it may take upto 200-600 mA ,

Generally battery (lead-acid) comes into 6V 1.3AH (1300mAH)(wight is aprox 160gms),6V 4.5AH (wight is aprox 900gms),12V 1.3AH (wight is aprox 290gms),12V 7.5AH (wight is aprox 2.25KG), 12V-120AH ...... Even More

NimH battery comes 1.2V -700mAH,1000mAH,1300mAH,2300mAH,2500mAH (wight is aprox 50gms),
you will need 10 such battery connected in series so that  it becomes 12V ,

Important
*If you use 700mAH battery in series (say 10 Nos) total will be 12V-700mAH
*dont mix different mAH battery
* Never use Nokia or other mobile battery , it may give you  bad experiance
* China made ordinary batteries are not reliable (it may sows you full voltage in no load - but as soon you connect it to your bot or any other load it may show 10-20% of rated voltage -12V become 1.2-2.4 V  Sad

All the Best  Wink
 
Here you can find different battery
http://www.onlinetps.com/shop/index.php?main_page=index&cPath=14_60


for further query please feel free to ask
« Last Edit: August 23, 2012, 09:30:59 PM by admin » Logged

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« Reply #1 on: September 26, 2010, 12:54:28 AM »

Nice article on Batteries

A battery converts chemical energy into electric energy through an electro-chemical process. The basic unit is called a "cell" and can be manufactured in a wide variety of shapes and sizes. Batteries are made up of one or more cells in series or parallel combinations to create the desired voltage and output capacity.

The electro-chemical cells consistsof two terminal suspended in an electrolyte. The terminals are called the anode (-) and the cathode (+). An electrical current is essentially a flow of electrons, and the battery can be regarded as an electron pump. The chemical reaction between the anode and the electrolyte forces electrons out of the electrolyte and into the anode metal, through the circuit, then back to the cathode. From the cathode metal, the electrons re-enter the electrolyte. This direction may seems strange, from negative to positive. We regard ‘current’ as flowing from positive down to negative, but in fact, this current is a flow of electrons in the opposite direction! The anode and cathode both get converted during this reaction, one is ‘eaten away’, and the other has a build-up of material on it. When a rechargeable battery is recharged, this chemical reaction is reversed, and the terminals are restored. ------------

http://homepages.which.net/~paul.hills/Batteries/BatteriesBody.html
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« Reply #2 on: September 27, 2010, 12:57:20 AM »

For Ni-Mh Rechargeable battery
Dos
1.    Read the instructions on your device before installing batteries.
2.    Insert batteries into your device properly, with the (+) and (-) terminals aligned correctly.
3.    Always fully charge your batteries before use.
4.    When you charge the batteries for the first time, or if the batteries have been stored for a long time, it normally takes about 3 charge and discharge cycles for the batteries to regain full capacity.
5.    It is normal for batteries to become hot during charging and they will gradually cool down to room temperature after fully charged.
6.    Store the batteries in a cool and dry place.
7.    Remove batteries from the electrical device if the device is not going to be used for a long time.
8.    Keep battery contact surfaces and battery compartment contacts clean by rubbing them with a clean pencil eraser or a rough cloth each time you replace batteries.
9.    If the performance of the batteries decrease substantially, it is time to replace the batteries.
10.    Keep batteries away from children. If swallowed, contact a physician at once.

Don'ts

1.    Do not charge other types of batteries such as alkaline, carbon zinc, lithium, rechargeable alkaline or any other kind of batteries not specified as they may leak or burst, causing personal injury and damage.
2.    Do not charge batteries of different capacities at the same time except when the charger is equipped with individual charging channels.
3.    Do not charge batteries of different residual capacities (e.g. flat batteries and partially discharged batteries) at the same time except when the charger is equipped with individual charging channels.
4.    Do not overcharge or overdischarge batteries. It will decrease the batteries' service life.
5.    Do not mix batteries of different types (e.g. NiMH, NiCd, alkaline, etc.) and capacities (e.g. 1300mAh and 1600mAh) in the electronic device.
6.    Do not short circuit, incinerate and disassemble batteries.
7.    Do not dispose of batteries in fire. They can rupture or leak.
8.    Do not drop or cause unnecessary shocks to the battery.
9.    Do not carry loose batteries in a pocket or purse with metal objects like coins, paper clips and hair pins, etc. This will short circuit the battery, generating high heat.
« Last Edit: September 27, 2010, 12:58:57 AM by admin » Logged

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« Reply #3 on: August 23, 2012, 09:30:06 PM »

Here is one more good link
http://en.wikipedia.org/wiki/Rechargeable_battery
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