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So, how DO I charge a 6V SLA battery?

Started by Anonymous in sci.electronics.basics16 years ago 26 replies

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous...

I bought a 6V, 6Ah battery from Home Depot to power my 3-year-old's toy electric car (the kind that a kid can ride). The previous battery didn't hold a charge when I bought the car. One reference from batteryuniversity.com mentioned something about 2.50V per cell for SLA batteries. I'm assuming my battery has 3 cells. Another website mentions use of an L200 voltage regulating chip (http...


75332P MOSFET drain connected to which battery terminal?

Started by John Doe in sci.electronics.basics13 years ago 11 replies

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects...

I have a 75332P MOSFET on a cordless drill controller heatsink. I guess it's part of a pulse width modulator. The drain (flange) connects directly to one of the battery terminals. Does the MOSFET drain go directly to the battery minus/ground terminal? Or does it go to the battery plus terminal? Thanks. -- My application... I'm desperately trying to develop a better inline ...


Jus Run the Voltage Backwars Thru a 8 v Battery

Started by Bret Cahill in sci.electronics.basics2 years ago 1 reply

The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery.

The Fieri light runs on 4 rechargeable cells 2p X 2s. Just wire it so that the voltmeter always gets 8 volts less than the ebike battery.


Absolute Cheapest Load To Test A Rebuilt Battery

Started by Bret Cahill in sci.electronics.basics2 years ago 5 replies

Need to draw 18 Amps from a 36 v battery. For 5 minutes. 2 lugs in a brine solution? Drive rebar into the ground?

Need to draw 18 Amps from a 36 v battery. For 5 minutes. 2 lugs in a brine solution? Drive rebar into the ground?


Overcharging NiMh batteries?

Started by Bill Bowden in sci.electronics.basics9 years ago 3 replies

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a...

My neighbor has a solar powered outdoor decoration light that cycles through several colors but only runs for maybe an hour at night. It has a single 1200 mAh 1.2 volt rechargeable battery and a couple small solar cells to charge the battery. I measured the load current at 15 milliamps and the charge current at only 1.3 milliamps so it appears the solar array is not charging the battery ...


Are there 22.5v. batteries?

Started by Ramon F. Herrera in sci.electronics.basics13 years ago 38 replies

I was looking at the schematics of the first transistor radio, the Regency TR-1, and noticed that it uses a 22.5v....

I was looking at the schematics of the first transistor radio, the Regency TR-1, and noticed that it uses a 22.5v. battery. http://people.msoe.edu/~reyer/regency/schematic.jpg Later models use a more normal battery such as 9v. -Ramon


Replacement for Li-Ion battery

Started by AK in sci.electronics.basics2 years ago 2 replies

I want to replace this 3.7 Volt Lithium Ion battery. The dimensions are 1 14/16 x 8/16 inch. Can some help me find a...

I want to replace this 3.7 Volt Lithium Ion battery. The dimensions are 1 14/16 x 8/16 inch. Can some help me find a replacement? Thanks, Andy https://imgur.com/a/w5v2dHI


How to know when to change battery in multimeter

Started by AK in sci.electronics.basics1 year ago 3 replies

On my multimeter, the voltage readings get inaccurate over time due to battery discharge. My meters all use 9 volt batteries. How can I tell...

On my multimeter, the voltage readings get inaccurate over time due to battery discharge. My meters all use 9 volt batteries. How can I tell when to change out the batteries? Thanks.


DC 17V from PC power supply?

Started by Mr. Man-wai Chang in sci.electronics.basics11 years ago 22 replies

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a...

1. If I shorted the +5V and +12V in the molex connector, would I get +17V? What's the max. current? 2. Could I use 17V to charge a notebook battery rated 16V and 3.8A? Would it hurt the battery? -- @~@ Remain silent. Nothing from soldiers and magicians is real! / v \ Simplicity is Beauty! May the Force and farces be with you! /( _ )\ (Fedora 18 i686) Linux 3.9.6-200....


How long to charge 9v nimh battery

Started by AK in sci.electronics.basics3 years ago 4 replies

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy

I have a 9V 180 ma discharged Nimh battery that I am charging at 25ma. How long will it take to charge? Thanks, Andy


*small* spark generator

Started by ScottM in sci.electronics.basics12 years ago 20 replies

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic...

I need to generate sparks between two pieces of brass, about a half inch apart or slightly more. I want each spark to be triggered by a logic line going high (going low would work, too.) The voltage supply is 6v or 12v from a battery. The problem is that I need the circuit to fit inside a 1.5" inside diameter PVC pipe, and not take up more than, say, 3" of the pipe length, discounting battery...


Power Routing Switch

Started by Rick C in sci.electronics.basics4 years ago 1 reply

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU...

Working on a gadget that uses a 12 volt motor (10 amp peak) and misc electr= onics running on lower voltages. It is powered from an external PSU like a= laptop supply, but 12 volts. There is also a sealed lead acid battery for= backup when the power fails. =20 This design uses pairs of pFETs to route the power from the 12 volts input = when present, or the battery when the line is not p...


EVs Will Soon Be Vastly Cheaper To Own Than Carbon Fuel Vehicles

Started by Bret Cahill in sci.electronics.basics4 years ago 35 replies

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better...

Daimler and others already pointed out that the battery upon which Tesla's e-Semi is based does not exist. Tesla isn't just hoping a better battery will appear, however. They have good information on it and it isn't all that insider: http://www.businessinsider.com/new-discovery-could-be-death-blow-to-traditional-lithium-ion-batt eries-2017-12 https://www.theguardian.com/environment/2017/dec


Recap On Absolute Cheapest Dummy Load

Started by Bret Cahill in sci.electronics.basics2 years ago

Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots...

Eventually road 15 km against the wind in highest assist. The motor and refurbished battery were both uniformly warm. There were no hot spots on the battery in the one minute dummy load test so this is not surprising. Range in medium assist increased from 40 km to 60 km, flat land no wind. Now the bad news. Water filter clogged up and I rummaged around for a fresh charcoal filter. Foun...


Solar charger

Started by AK in sci.electronics.basics3 years ago 10 replies

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still...

I have a solar charging I am using with my car battery. The current voltage of the battery is 12.7 volts. And the charger is still charging. Here are some specs for the charger. Rated power output = 5W Operating power voltage = 18V Operating power current = .33A Trickle charging current = .2A Floating charging Voltage = 13.8 Overcharge Protection Voltage = 14.1 Voltage At what ...


Phone no longer charges

Started by AK in sci.electronics.basics1 year ago 2 replies

I have a Samsung S5 cell phone. It just now stopped charging. ?? I have tried at least 3 different charging cables, and 3 different...

I have a Samsung S5 cell phone. It just now stopped charging. ?? I have tried at least 3 different charging cables, and 3 different chargers. I also removed the battery and did a factory reset. Anyone have any other ideas? Thanks.


Trying to understand math for Battery resistance ?

Started by StevWolf in sci.electronics.basics1 year ago 2 replies

I=E2=80=99m working though understanding this description in this book. see= attachment link below. I have tried this method for testing...

I=E2=80=99m working though understanding this description in this book. see= attachment link below. I have tried this method for testing household batteries. I know there are = other ways of testing batteries, but really I'm just trying to work my way = through this book as a personal exercise. Please refer to link below for the book example Im trying to follow. The ha= nd written notes are...