NiMH charger recommendations?

Started by DaveC in sci.electronics.basics8 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.basics4 years 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.basics7 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.basics6 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....


car 12v phone chargers

Started by Ivan Vegvary in sci.electronics.basics6 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.basics7 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...


OT: Lead Acid Float Charger

Started by Jim Thompson in sci.electronics.basics4 years 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...


Wireless phone charger

Started by Steve Wolf in sci.electronics.basics1 month ago 5 replies

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it...

Just for fun I thought I would make a wireless phone charger. I'm not reall= y going to use it but I wanted to build it and just see if it actually work= ed. The circuit uses two coils and a 2n222 transistor very simple. Well I can't really get it to work maybe I could get half a volt maybe to p= ast through induction. Then it seems to stop. I connected my meter to the r= eceiving coil to t...


Re: Battery charging circuit

Started by Uncle Steve in sci.electronics.basics7 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


Is this homemade battery charger circuit dangerous?

Started by Kanon Kubose in sci.electronics.basics7 years ago 41 replies

The other day I found plans for a $3 battery charger that was just a diode = and light bulb in series with the battery, using mains electricity....

The other day I found plans for a $3 battery charger that was just a diode = and light bulb in series with the battery, using mains electricity. I poste= d a question about modifying it with a dimmer switch here: https://groups.g= oogle.com/forum/#!topic/sci.electronics.design/dW8otaIKNyE Everyone there said I was a candidate for a darwin award and that I should = come to sci.electronics.ba...


Cell phone fast charging circuits

Started by Anonymous in sci.electronics.basics1 year ago 6 replies

Hello, My Motorola phone supports "Turbo" charging, apparently charging my phone at 9-12V after establishing a secret handshake with the...

Hello, My Motorola phone supports "Turbo" charging, apparently charging my phone at 9-12V after establishing a secret handshake with the charger. https://www.motorola.com/us/products/turbopower Is there a chip that performs this authentication? I'd like to build a car charger for my phone without blowing it up, but I haven't seen any sample schematics. All I've seen is a reference t...


Re: Battery charging circuit

Started by Uncle Steve in sci.electronics.basics7 years ago 2 replies

On Mon, May 06, 2013 at 02:35:52PM -0500, Tim Wescott wrote: > On Mon, 06 May 2013 12:01:44 -0400, Uncle Steve wrote: > > > Back again for...

On Mon, May 06, 2013 at 02:35:52PM -0500, Tim Wescott wrote: > On Mon, 06 May 2013 12:01:44 -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 > > e


Q: Any Problems with chargers with too high or low a capacity

Started by Anonymous in sci.electronics.basics7 years ago 2 replies

I'm very happy that more and more wall chargers are the 5 VDC micro or mini types but many people just grab the nearest one. My questions are...

I'm very happy that more and more wall chargers are the 5 VDC micro or mini types but many people just grab the nearest one. My questions are what problems, if any, exist in using a charger that has a too low or too high amp capacity for the item being charged. Question 1: Say my camera came with a charger rated .7Ahr and I try to charge this camera with one rated .5 or .3Ahr. Seems to me th...


Current regulator

Started by nescafe in sci.electronics.basics8 years ago 40 replies

Hi. I need to create some kind of charger. The "charger" will be powered from dc source ( 1,5 AA battery ). The voltage should stay the same...

Hi. I need to create some kind of charger. The "charger" will be powered from dc source ( 1,5 AA battery ). The voltage should stay the same but the current should be regulated like this: - charge time: 1 day --> 1,5 / 50mA - charge time: 2 hours --> 1,5 / 100mA - charge time: 4 hours --> 1,5 / 200mA - charge time: 4 hours --> 1,5 / 500mA - charge time: 7 hours --> 1,5 / 1A ----------


Transistors

Started by Uncle Steve in sci.electronics.basics7 years ago 60 replies

Ok, this is a question that is not so battery-charger specific, but is obviously related. So here's a circuit fragment: 18V ...

Ok, this is a question that is not so battery-charger specific, but is obviously related. So here's a circuit fragment: 18V +----+--------__^------/\/\/-----------+ | 2n3055| 0R5 | | | 5W / | | \ 5R10W | | / |_______|>


Question for the group..

Started by Dave in sci.electronics.basics7 years ago 27 replies

I have an automatic battery charger which is totally non-functional, apparently not sensing when it is connected to a load, and the first thing...

I have an automatic battery charger which is totally non-functional, apparently not sensing when it is connected to a load, and the first thing I note about it is that it makes prodigious use of the 2N3904 transistor on its main control board. And one of these (2N3904) has an odd characteristic- it measures .676 VDC from emittor to collector, rather than the typical OL that the others m...


dead unused NiMH AA cells

Started by Adam Funk in sci.electronics.basics5 years ago 6 replies

I recently opened a pack of NiMH AAs that I'd had lying around for a while, & some of them wouldn't charge at all. I tried putting them in the...

I recently opened a pack of NiMH AAs that I'd had lying around for a while, & some of them wouldn't charge at all. I tried putting them in the fancy German charger as well (I can't remember the model name, but it's the one that has discharge, test, & refresh modes) but it just showed "null" for them, as if they weren't even there. Is there some need to charge NiMH cells as soon as you buy ...


Keeping a 12v battery charged above 80%

Started by W. eWatson in sci.electronics.basics8 years ago 22 replies

I had a fellow out to do some electrical work that involves one 12v marine battery. The battery will be used about 4-6 hours a night...

I had a fellow out to do some electrical work that involves one 12v marine battery. The battery will be used about 4-6 hours a night sporadically. Maybe 15-20% of the time. He offered that it should be recharged every day, and keeping it above 80% was important for the life of the battery. Somehow that seems a bit high. Apparently, there's a charger of some sort that costs about $150 th...


non-destructively finding a break in an insulated DC wire

Started by Adam Funk in sci.electronics.basics6 years ago 15 replies

I have a wall-wart charger that put out 4.2 V DC on a figure-8 cable just over 1 metre long. There seems to be a weak spot or...

I have a wall-wart charger that put out 4.2 V DC on a figure-8 cable just over 1 metre long. There seems to be a weak spot or intermittent break in one of the wires --- sometimes it doesn't work but jiggling the cable makes it work. Is there any non-destructive way to find the position of the break? (I know I could cut it in half, test both halves, repeat as necessary, ... solder all the...


Voltage variations damage?

Started by jim stone in sci.electronics.basics7 years ago 5 replies

Have just received by post a 'Fone Storm' car charger for a Huawei Ascend g300 phone. I wanted to check the specs to see if I had been sent the...

Have just received by post a 'Fone Storm' car charger for a Huawei Ascend g300 phone. I wanted to check the specs to see if I had been sent the right one for this phone. On the box it says input DC 12v-24v. Output DC 4.2v - 10v. 500ma, max 750ma. I always understood that tiny components could be damaged by even fairly minor variations in voltage, so am surprised that the output ca...