is a cell phone charger with less amperes ok?

Started by interuser in sci.electronics.basics10 years ago 1 reply

Hi. I lost my cell phone charger and want to buy another one. my original charger's output was 5V 1A DC. I found one which is 5V 550mA DC. Is...

Hi. I lost my cell phone charger and want to buy another one. my original charger's output was 5V 1A DC. I found one which is 5V 550mA DC. Is this ok? I am guessing it should be, but it will take longer to charge. Also, i guess that this charger should not be dangerous for my cellphone because it is a motorolla charger (my cell is O2 XDA but that does not matter) Someone please confirm ...


cellphone charger making cracking noise

Started by interuser in sci.electronics.basics11 years ago 16 replies

Hi, I recently bought a (non original) charger for my cellphone (o2 atom) . After 3-4 uses without problems , now when I sometimes plug it in...

Hi, I recently bought a (non original) charger for my cellphone (o2 atom) . After 3-4 uses without problems , now when I sometimes plug it in and put the cellphone on, I hear some cracking noises. The charger is electronic charger, the mains supply is 240V, the charger's input is 100-240V 50/60HZ and the output is 5V 1A I tried plugging it in different sockets and different homes and also...


MacBook 13" charger circuit

Started by Jack B. Pollack in sci.electronics.basics8 years ago 9 replies

I have a MacBook 13" (not under warranty). When the charger is connected it does not light or charge the battery. I have tested the battery and...

I have a MacBook 13" (not under warranty). When the charger is connected it does not light or charge the battery. I have tested the battery and charger on another MacBook and they are fine. I have reset PRAM and SMC. Cleaned both the charger contacts and the ones on the computer. Occasionally if I leave the charger connected to the computer for several minutes I get a faint flickering l...


What kind of battery charger ?

Started by mowhoong in sci.electronics.basics7 years ago 28 replies

I brought a Ansmann ALCS2-24A' auto voltage detacts charger from a shop " Element 14". I encounter a problem. My 6 volt 10A lead acid battery at...

I brought a Ansmann ALCS2-24A' auto voltage detacts charger from a shop " Element 14". I encounter a problem. My 6 volt 10A lead acid battery at its weakest measure 3.59 volt when I connected to this charger which indicate it tobe 2 volt value instead of 6 volt. I I assumed the issue was problem with the charger and brought a 2nd one with same brand and model. At testing counter in the shop ,...


How hot should NiMH's get in the charger

Started by Bearded Occam in sci.electronics.basics10 years ago 4 replies

New subscriber here. I have a set of Sony AA size NiMH's that are the original batteries which came with the charger. Upon charging for a...

New subscriber here. I have a set of Sony AA size NiMH's that are the original batteries which came with the charger. Upon charging for a couple hours, they are almost too hot to hold in my hand. Normal? Safe? Advice? Second question: Is there any reason to fear using other brands of NiMH's in the same charger?


NiMH charger recommendations?

Started by DaveC in sci.electronics.basics5 years ago 20 replies

First of all, this is a request for a *recommendation*, not a request for someone to do Google searches for me. - - - I need a charger for AA,...

First of all, this is a request for a *recommendation*, not a request for someone to do Google searches for me. - - - I need a charger for AA, AAA, and 9v batteries. Four of the AA or AAA at a time is OK. I see very few that support all these batteries (Maha makes a separate charger for 9v). Of those that do, not all use delta-V termination (or don't specify). Of those remaining th...


OT Lipo battery charger

Started by George Herold in sci.electronics.basics1 year ago 1 reply

So my son is into RC... He's bought some old RC cars back to life and watns to run them with new Lipo batteries. We are now looking for a...

So my son is into RC... He's bought some old RC cars back to life and watns to run them with new Lipo batteries. We are now looking for a battery charger. Any recommendations? price ~$100. This one in particular, http://www.ebay.com/itm/Venom-Pro-Duo-80W-X2-Dual-AC-DC-7A-LiPo-NiMH-RC-Battery-Balance-Charger- /401004922785 TIA George H.


Making DC battery Power

Started by Meanie in sci.electronics.basics4 years ago 19 replies

I asked a question about batteries and DC power adapter a few weeks ago and now I have a small (I hope) dilemma. I am using the advice of a...

I asked a question about batteries and DC power adapter a few weeks ago and now I have a small (I hope) dilemma. I am using the advice of a cordless battery pack and charger to power my wife's yarn spinner. I purchased a charger for a tool I already have to eliminate buying more accessories. Therefore, I bought this second charger > > > http://www.flickr.com/photos/18223943@N06/92134118


Pin extraction tool

Started by MG in sci.electronics.basics4 years ago 3 replies

I have a Kenwood portable radio charger KVC-5A for my fire department radio. We purchased some new Kenwood radios. The new radios require...

I have a Kenwood portable radio charger KVC-5A for my fire department radio. We purchased some new Kenwood radios. The new radios require a KVC-20L vehicle charger. Kenwood moved one pin on the wire plug to the charger. Rather than running a new set of cables from the battery to the charger, I want to move one pin. However, I cannot find the correct sized pin extraction tool. I purchased a 0....


can a charger bought for 2100mAh used for 2500 or 2700 mAh?

Started by interuser in sci.electronics.basics10 years ago 1 reply

Hi. I have a sony cybershot photo camera that came with 2100mAh rechargeable sony AA batteries and their charger. Now the batteries died (after...

Hi. I have a sony cybershot photo camera that came with 2100mAh rechargeable sony AA batteries and their charger. Now the batteries died (after quite some use). Can I use the new sony 2500mAh or 2700mAh batteries with this same charger? (I hope their diameter is the same) Also, they wouldn't damage my camera, right ?


Is a USB Charger Universal?

Started by Talal Itani in sci.electronics.basics10 years ago 9 replies

Hello, Rechargeable MP3 players recharge from the PC's USB port. I want to buy a wall charger, for travel, for MP3 players. Do I have to...

Hello, Rechargeable MP3 players recharge from the PC's USB port. I want to buy a wall charger, for travel, for MP3 players. Do I have to buy a charger specific for my MP3 player? Thanks, T.I.


Repairing a lead acid battery charger

Started by Pandora in sci.electronics.basics10 years ago 23 replies

I have an old sealed lead acid battery (Yuasa EN320-2RS) which has a 2V output and 320Ah capacity. Although it was never used much, I guess it...

I have an old sealed lead acid battery (Yuasa EN320-2RS) which has a 2V output and 320Ah capacity. Although it was never used much, I guess it is about seven years old so is probably long gone and I intend to buy an identical replacement. I also have a lead acid battery charger which I tried on the aforementioned battery without success. The charger is a 2/4/6/8/10/12V multi-range 1A float...


Why is Motorola USB not Blackberry USB (chargers = 5.0v, 5.9v, 350ma, 500ma)

Started by Emily in sci.electronics.basics9 years ago 18 replies

Is it true that one MUST use ONLY the EXACT USB charger that comes with their cell phone or digital camera? Are USB chargers really not...

Is it true that one MUST use ONLY the EXACT USB charger that comes with their cell phone or digital camera? Are USB chargers really not interchangable? The T-Mobile store told me I could only use their T-Mobile charger for my new USB based cellphone. After showing me the charger for the Motorola V195 which is 5.9 volts 375ma, they then opened a desk drawer and handed me three melted...


car 12v phone chargers

Started by Ivan Vegvary in sci.electronics.basics3 years ago 6 replies

Why do they take longer to charge than mt wall charger. The output of my wall charger is 5v. Seems like my car should be able to imitate that...

Why do they take longer to charge than mt wall charger. The output of my wall charger is 5v. Seems like my car should be able to imitate that level. ?? Thanks Ivan Vegvary


Charge gel cell with car charger?

Started by Mike Cook in sci.electronics.basics5 years ago 57 replies

A friend has a battery powered Ryobi lawn trimmer ("weed whacker") which doesn't work. The 12vdc wall wart puts out only ~ 12.4v. I charged...

A friend has a battery powered Ryobi lawn trimmer ("weed whacker") which doesn't work. The 12vdc wall wart puts out only ~ 12.4v. I charged the lead-acid gel cell using a car charger. The charge rate (selectable) was 0.5A. Afterward the trimmer seemed to work as new. Can the car charger be used to charge this battery? He can install a timer to limit charge time if that's something req...


Crank powered USB charger?

Started by kiqyou_vf in sci.electronics.basics8 years ago 1 reply

Hello, I would like to build a simple crank powered USB charger. I have very little experience in electronics, but I think this is how I would...

Hello, I would like to build a simple crank powered USB charger. I have very little experience in electronics, but I think this is how I would do it: http://docs.google.com/View?id=df4479zw_145npdcsbmj Any guidance concerning components types/specifics and general design would be greatly appreciated. Thanks a lot for reading!


OT: Lead Acid Float Charger

Started by Jim Thompson in sci.electronics.basics1 year ago 54 replies

I drive my pick-em-up truck every few months. So the battery is dead when I go to use it... like today :-( I'm looking for recommendations...

I drive my pick-em-up truck every few months. So the battery is dead when I go to use it... like today :-( I'm looking for recommendations for the _best_ (*) float charger I can buy to just plug the truck into when it's parked. (*) Cost no object. ...Jim Thompson -- | James E.Thompson | mens | | Analo...


One More Battery Issue: Charging

Started by mea305 in sci.electronics.basics11 years ago 3 replies

For those of you who 'chimed in' for me with regard to my scooter and the placement of another set of batteries, I have encountered a problem:...

For those of you who 'chimed in' for me with regard to my scooter and the placement of another set of batteries, I have encountered a problem: charging. I have (had) a 12 volt charger that worked very well; that is, it worked until I attempted to place the charger on the three sets of batteries (as some of you may recall, I mentioned that I had three sets -- all of them are arranged in the sa...


Battery Charger Temperature Cutoff

Started by Joe in sci.electronics.basics10 years ago 1 reply

I built a NiMH charger based on the Maxim 712 chip some time ago. I didn't implement the temperature cutoff part of the chip's capability, and...

I built a NiMH charger based on the Maxim 712 chip some time ago. I didn't implement the temperature cutoff part of the chip's capability, and now would like to do that. Here's the main question: How much above ambient temperature should the cutoff be? Thanks. --- Joe


Re: Battery charging circuit

Started by Uncle Steve in sci.electronics.basics4 years ago 30 replies

On Mon, May 06, 2013 at 12:01:44PM -0400, Uncle Steve wrote: > Back again for some more abuse. > > I'm building a 12V battery charger that...

On Mon, May 06, 2013 at 12:01:44PM -0400, Uncle Steve wrote: > Back again for some more abuse. > > I'm building a 12V battery charger that will be controlled by a small > low-power microcontroller. I've not yet hooked up the > microcontroller, but most of the code is written and I'm trying to > finalize the charger electronics before I hook it up. > > The circuit is very simple. An 18V