Are Old Car Batteries Faulty

There is no deal with battery old or new.
Its all about the capacity of charge it holds and for how much time it can hold up to that charge.

Yes by its age the battery gets weak and the capacity to hold the charge gets less and due to these reasons the battery shows 12 volt and still needs replacement.


The battery has to be properly checked before considering it OK. The battery requires more than just a voltage level to be good, in that when a battery dies, under most circumstances it will still show ~12.5V. This is because the voltage level is a function of the cells inside the battery. Each cell has approximately 1.75 to 2.25 volt capacity, and in order for a cell to drop below 1.75, it has to physically short/collapse/etc... meaning as long as you do not have a dead cell, you will always have 11V or high in a battery, regardless of it's charge level.So even weak battery will show good voltage.But its all about for how much time it can hold up to that 12 volt charge.

So if you assume that battery is good,but still you think that battery is very old and can be the problem,then dont hesitate to get the battery bench tested to confirm its charging holding and in-charge capacity.
The charge level is only able to be tested by load application, requiring a battery tester. This will determine the total amount of amperage available in the battery, and the effective amperage drop under load.
Getting the battery tested with proper tools will let you know whether is sure shot battery problem or something else causing the battery to get drained and making it low on charge.


These details will help.
Thanks.

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Battery Drains in Cordless phones?

This battery draining problem is noticed in many devices.The cordless phones,cordless mouse other cordless toys and devices.
There are many instances of battery draining but most of the time it is due to poor quality of battery including those that are in shelves which have lost the charge capacity.This few details will help you to understand and stop this battery drain problem:----

Unless the phone is showing any malfunction we cannot confirm unless a drain test is taken in the standby condition of the phone.This must be quite negligible current about few mAmps . If there drains is more check for leak in the battery source to the IC feed, a possible zener shorting or a capacitor leaking.
However if the phone is using up power on talk time , it can be due to drain in a functioning circuit which will be hard to find , but check for unusual heating in any components.
If there was leak in the board this must be ccleaned out well with petrol and may be insulated with varnish.
If however the phone works fine then it can be the fault of the battery itself as it could have developed reverse polarity.
Let the battery drain off fully and recharge, if possible a jump charging with an external voltage might sometimes cure this issue.
If not change the battery with the correct current rating.
This details will help.Thanks.
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