Hello All,
This is in public interest so I hope the list admins don't block this.
In today's Times of India 17th Aug., there is an writeup on page 27 called "Not just laptops, phones can burn too". Here the author suggests that if they find that their Dell laptop has the suspect battery, then remove it from the laptop and use the laptop on mains power.
IMHO feel that powering the laptop without a battery could cause permanent DAMAGE to it. Any device that uses a rechargable battery has a charger that has an output voltage thats higher than the battery level. The battery acts as a load resistance and limits the maximum voltage to its maximum charge level. In the abscence of a battery, the full voltage of the charger gets kicked into the device's ass and that damages the circuit inside. This applies to mobiles and cordlesses too.
So if you love your laptop or mobile, please do not power it without a battery.
If anyone has any *technical* input regarding this matter then post your replies or else please don't bomb this thread either from land or outer space nor treat it like a chai tapri or an Irani hotel for off tangent discussions.
Regards,
Rony.
___________________________________________________________ All new Yahoo! Mail "The new Interface is stunning in its simplicity and ease of use." - PC Magazine http://uk.docs.yahoo.com/nowyoucan.html
On Thursday 17 August 2006 17:28, Rony wrote:
So if you love your laptop or mobile, please do not power it without a battery.
AFAIK any charger has an over voltage / under voltage protection. So if there is no battery, it wont damage it. The onboard circuits should detect that the battery is missing and give the appropriate message while booting up.
On 8/18/06, Dinesh Joshi dinesh.a.joshi@gmail.com wrote:
On Thursday 17 August 2006 17:28, Rony wrote:
*snip*
The problem lies in the batteries, and that's the reson Dell has issued a recall for all battries shipped between April 1, 2004 and July 17, 2006. That would be 4.1 million batteries. You might want to get yours replaced, ie. if you have a Dell Laptop.
http://www.wired.com/news/technology/0,71596-0.html?tw=rss.technology
AFAIK any charger has an over voltage / under voltage protection. So if there is no battery, it wont damage it. The onboard circuits should detect that the battery is missing and give the appropriate message while booting up.
The charger voltage never exceed battery voltage for lithium battery under load condition. Lithium battery can not accept even 5% over voltage. So when charger is connected to laptop / mobile (without battery), due to loading by laptop / mobile, the voltage is maintained at battery level. Hence no damage can be caused.
I am using my laptop, without battery for last 2 years.
Best Regards,
Mukund Deshmukh. Beta Computronics Pvt Ltd 10/1, IT Park, Parsodi, Nagpur-440022 Cell - 9422113746
On Thursday 17 August 2006 10:58 pm, Rony wrote:
If anyone has any *technical* input regarding this matter then post your replies
all chargers are current driven devices. Hence all chargers have undervoltage protection by default and over voltage protection as an absolute neccessity. So No battery means charger clamps o/p to some safe level. Note some cheap standalone chargers do not have such protection and are dangerous. But rest assured that all phones and laptops will have these. Many chargers switch the battery voltage to a sense ckt, check if it's charged by discharging a little then continue charging. Some phones and devices have this built into the device / phone and hence can charge from any dc source. Batteries also have a thermistor built in to prevent Dell type mishaps.
Rgds JTD
On Fri, Aug 18, 2006 at 04:55:54PM +0530, jtd wrote:
Note some cheap standalone chargers do not have such protection and are dangerous. But rest assured that all phones and laptops will have these.
Thank you all for your inputs and updates on new technologies.
Regards,
Rony.
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