Charger recommendations

Started by Andy in sci.electronics.design5 years ago 17 replies

I am looking at the Nitecore D4 Digicharger/Four Channel Universal Smart Battery Charger/LCD Display and GYRFALCON All-44 4 Channel Digital...

I am looking at the Nitecore D4 Digicharger/Four Channel Universal Smart Battery Charger/LCD Display and GYRFALCON All-44 4 Channel Digital Battery Charger. What do you recommend ? I read where 26650 have a higher capacity than 18650s. Andy


usb fast charger question

Started by T in sci.electronics.design11 months ago 46 replies

Hi All, I asked about the voltage of a USB fast charger. I got back: 5V-3A, 9V-3A, 12V-3A, 15V-3A, 20V-3A My Android tablet wants 5.2V,...

Hi All, I asked about the voltage of a USB fast charger. I got back: 5V-3A, 9V-3A, 12V-3A, 15V-3A, 20V-3A My Android tablet wants 5.2V, 2.0 A Uhhhh. Is there something about the USB cable that tell the charger not to fry what I plug it into? https://www.amazon.com/dp/B08786SHXV Many thanks, -T


NiMH charger recommendations?

Started by DaveC in sci.electronics.design10 years ago 25 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...


battery charger

Started by RichD in sci.electronics.design1 year ago 5 replies

I picked up a AAA NiMh battery charger. The label reads: Output: 1.2 V 800 mA AA/AAA charging: 120 mA Why the two different current...

I picked up a AAA NiMh battery charger. The label reads: Output: 1.2 V 800 mA AA/AAA charging: 120 mA Why the two different current specs? Does not compute - -- Rich


SLB and charger question

Started by Andy K in sci.electronics.design9 years ago 3 replies

I would like to buy a NP 4-6 Yuasa 6 Volt 4 Amp Hour Battery. Would this charger work and how do I determine how long to recharge a discharged...

I would like to buy a NP 4-6 Yuasa 6 Volt 4 Amp Hour Battery. Would this charger work and how do I determine how long to recharge a discharged battery ? Model: HB-0702-01 Input: AC100-240V 50-60Hz 0.2A Output: DC7.2V 1.0A I would be powering some led lights that operate at 3.0 volts, so I would need to find out how to step down the voltage as well. Thanks.


OT: Lead Acid Float Charger

Started by Jim Thompson in sci.electronics.design6 years ago 79 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...


NiMh charging formula

Started by Andy K in sci.electronics.design8 years ago 22 replies

I have a "dumb" NiMh/NiCd charger. For 9 volt batteries, it specifies 25 milliamps. The charger manual gives this charge...

I have a "dumb" NiMh/NiCd charger. For 9 volt batteries, it specifies 25 milliamps. The charger manual gives this charge formula. Charging time(h) = 1.2 x battery capacity (mAh) -------------------- charging current (mA) 13.44 hrs. Is is formula useful or is there something better that factors in the starting Voltage ? Thanks.


Shady Dell laptop practices

Started by bitrex in sci.electronics.design5 years ago 41 replies

On some of the inexpensive Dell laptops they implement a hardware-lockout system intended to prevent you from using aftermarket charger bricks...

On some of the inexpensive Dell laptops they implement a hardware-lockout system intended to prevent you from using aftermarket charger bricks to charge the battery. The way they do this is there's a chip in the Dell charger that contains a unique identifier which a chip on the laptop mobo requests from it on startup over a one-wire interface. If on boot the BIOS can't confirm that the ...


car usb charger not durable

Started by bob in sci.electronics.design9 years ago 28 replies

I have gone through several car usb chargers that plugs into cigarette lighter plug. They usually die in a few months. I just opened one up...

I have gone through several car usb chargers that plugs into cigarette lighter plug. They usually die in a few months. I just opened one up and it has a 34063a IC in it. The circuit is probably similar to this: http://www.ifixit.com/Teardown/Generic+1A+USB+Car+Charger+Teardown/10108 When I plug this in it draws 3mA but the built-in LED doesn't light up. I assume the IC has fried. ...


strange blue laser optics

Started by John Larkin in sci.electronics.design3 years ago 42 replies

I got a couple of these, to maybe cure UV-set...

I got a couple of these, to maybe cure UV-set epoxy. https://www.ebay.com/itm/High-Power-Purple-405nm-Pointer-Burning-Light-Beam-Pen-with-Battery-Cha rger-USA/383162483108?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 It came with a big lithium battery and a charger. Two weird things: If I shoot it at a white wall, I can see the spot with my right eye, but not with my


AC charger for NiCd AA battery?

Started by Borrall Wonnell in sci.electronics.design10 years ago 8 replies

Hi all, I have a device which is powered by a solitary 1.2V 800 mA NiCd cell. An AC wall charger (5VAC @ 180 mA) is used to charge the cell. ...

Hi all, I have a device which is powered by a solitary 1.2V 800 mA NiCd cell. An AC wall charger (5VAC @ 180 mA) is used to charge the cell. This is done via a simple half-wave rectifier that is built in to a small circuit board inside the device. The battery sees about 90 mA (true RMS). It seems strange to use a hard-to-find AC power source rather than a commonly available DC wall ada...


USB to TP4056 charger - why is the diode there?

Started by Peabody in sci.electronics.design2 years ago 4 replies

This is the relevant part of the schematic of an 18650 battery charger and boost converter (to 5V)...

This is the relevant part of the schematic of an 18650 battery charger and boost converter (to 5V) module: https://i.postimg.cc/Tw7X35Fq/USB-to-TP4056.jpg And here's the module: https://www.aliexpress.com/item/32870411748.html Coming from the USB power pin, there's a series Schottky diode and a very low value resistor. The resistor is found in the TP4056 datasheet typical applic...


12V Circuit breakers for auto battery chargers

Started by Anonymous in sci.electronics.design10 years ago 13 replies

I have a battery charger that is rated at 2, 15, or 100 amps. It's a Everstart WM-1510 ma model. (Walmart). I found that Schumacher has...

I have a battery charger that is rated at 2, 15, or 100 amps. It's a Everstart WM-1510 ma model. (Walmart). I found that Schumacher has an identical charger model SE-1510 ma. That says these Everstart chargers are made by Schumacher. Anyhow, the 12v circuit breaker has died and will not reset. That seems to be the most common problem on all chargers. My question is this. The Schu...


review this battery charger

Started by Cydrome Leader in sci.electronics.design9 months ago 29 replies

What do you folks think about this gem: https://www.youtube.com/watch?v=cpaWCedoptA I like the special high reluctance transformer and...

What do you folks think about this gem: https://www.youtube.com/watch?v=cpaWCedoptA I like the special high reluctance transformer and kindling used as insulation.


Mobile EV charger

Started by Ed Lee in sci.electronics.design2 months ago 5 replies

A few months ago, I talked about it to solve insufficient EV charging spots and ICEing problems. Rick said it was unnecessary. Well, they didn't...

A few months ago, I talked about it to solve insufficient EV charging spots and ICEing problems. Rick said it was unnecessary. Well, they didn't listen. https://video.foxbusiness.com/v/6309894742112#sp=show-clips


Charging time for Ultrafire 18650 6800 mAh battery

Started by Andy in sci.electronics.design4 years ago 44 replies

I would like to find out how long to charge the above battery. Charger puts out 500 mAh. Thanks.

I would like to find out how long to charge the above battery. Charger puts out 500 mAh. Thanks.


Hacking CCS from OBC

Started by Ed Lee in sci.electronics.design5 months ago 6 replies

Here is an image of the On-Board Charger: http://zoopow.com/leaf/PXL_20210210_233550127.jpg Is it sufficient to just tap the Proximity,...

Here is an image of the On-Board Charger: http://zoopow.com/leaf/PXL_20210210_233550127.jpg Is it sufficient to just tap the Proximity, Pilot and Output pins into a CCS socket? I know that it might be limited to 7 kw CCS.


Charging time for 12 V battery

Started by Anonymous in sci.electronics.design10 years ago 18 replies

I have a 12 Volt battery, 9.5 Ah that uses a 12 volt charger 1.0 amp. Assuming the battery is completely discharged, is there a way to...

I have a 12 Volt battery, 9.5 Ah that uses a 12 volt charger 1.0 amp. Assuming the battery is completely discharged, is there a way to determine how long to charge ? Thanks, Andy


Can anyone explain how this battery charger works?

Started by Commander Kinsey in sci.electronics.design7 months ago 130 replies

https://imgur.com/a/b8l5qKQ Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a...

https://imgur.com/a/b8l5qKQ Look at the circuit diagram. The positive of the battery is only connected through a capacitor. How can a capacitor possibly pass DC current to allow the battery to charge?


Lead Acid puzzle

Started by Tabby in sci.electronics.design2 years ago 34 replies

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I'm not clear what's...

Cart with 2x 12v 33Ah progolf AGM lead acids. 1.5 years after fitting new batteries the available range is down to below 10%. I'm not clear what's gone wrong. The charger in use has been a cheap chinese one with 2x13.7v=27.4v output. Single stage charging only. It has always been promptly charged after use, and never run below 50% charge. I checked the battery voltages after charge, they wer...