Questions tagged [battery]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
25
votes
6answers
33k views

How to prevent batteries leaking out in devices?

Is there a common method of preventing batteries from leaking out and destroying the device? Why does this happen in the first place? I have laid another head lamp to waste because it was sitting in ...
12
votes
8answers
4k views

Easy way of generating a 50-150W load @12V

I need to test a battery for its remaining capacity and to do that, I need to generate a constant load to be able to measure how long it can sustain that load. I tried using a 330W load (290W shoe ...
8
votes
4answers
62k views

What should I do with leftover sulfuric acid from a sump pump battery backup?

In our new house, we found that a previous owner installed a sump pump battery backup unit, which is nice. The battery in the system is like a car battery, but it's the kind where you initially add ...
5
votes
5answers
2k views

Sump pump automated battery backup

I have 1/3 horsepower sump pump currently plugged into my home's 120 volt outlet. I have a 105 amp hour 12-volt battery and a 1200 watt pure sine inverter ready to go when the power goes out. The ...
5
votes
3answers
3k views

Will neodymium magnets harm my power drill battery?

I glued some magnets onto my power drill battery to use for storing drill bits on - but will the magnets affect the battery life?
4
votes
3answers
234 views

Why have cordless tools changed the battery style?

I was looking for replacement batteries for my cordless tools (drill, light, sander) and have been unable to find any. My current battery is the style with a neck that inserts into the tool, but all ...
4
votes
3answers
3k views

How can I use cordless drill batteries in projects? [closed]

I found this project on Make for an automatic ball thrower for your dog, and am in the process of wrapping it up. For power, I'm using a cordless drill battery. (Specifically, a Ryobi lithium one+ ...
4
votes
3answers
6k views

Should I leave NiCad rechargeable batteries charging when not in use for long periods?

I've got an Black & Decker electric trimmer that gets used about 2 months out of the year. It uses a NiCd battery pack. For optimum battery life, should I leave it plugged in all year when not in ...
3
votes
2answers
7k views

What could cause a battery hedge trimmer to have white smoke come out of it?

For the most part my hedge trimmer was doing a really great job. I did have a little trouble with the thicker stems, so I would swing the trimmer at the stems while cutting, which helped. However, a ...
3
votes
1answer
769 views

Why does the Tesla PowerWall operate at 350v - 450v?

According to the Tesla website the new Powerwall operates at 350 to 450 volts? Why such a high voltage when most solar battery banks operate at 48V?
3
votes
1answer
92 views

How can I fix this handheld vacuum cleaner?

This is a handheld vacuum cleaner with a simple circuit inside. I’ve charged it fully for a good while and also tried decharge-recharging it but no joy. All it can manage to do is ticking the engine ...
3
votes
2answers
261 views

Solar backup system, advice needed

Here in South Africa we are experiencing frequent power blackouts, as I work from home on a small property (generators not an option) this is rather disruptive to my work as a programmer. So bearing ...
3
votes
1answer
204 views

Offgrid L14-30 connector to solar generator

I have a small off-grid cabin in the woods that I recently purchased. The previous owner had a L14-30 generator connector installed on the outside of the cabin and wired it with normal 120v outlets 4 ...
2
votes
3answers
598 views

Inverter Power draw from 12V battery

Given a 12V, 100A battery with a 1000w inverter, how many amps would a generic standard european 220V, 500W appliance draw per hour from the battery itself? I know wattage equals volts times amps, ...
2
votes
6answers
23k views

Replacing battery in backup sump pump

I have a PHCC 2400 battery backup sump pump. It started beeping today and the controller light indicated that the battery terminals were corroded or that the battery was bad. I opened up the case ...
2
votes
2answers
359 views

“power buffer” in front of generator for peak power shaving?

I need to do some work off-grid, and I only have a 1000W generator to drive my power tools, which easily draws twice that (and probably more when starting up) when cutting steel. Instead of getting a ...
2
votes
3answers
2k views

How can i set up a Solar Panel to charge a 12v DC car battery and power a Raspberry Pi?

I've pulled together a few spare parts that i've had laying about for ages now and I finally have a bit of time to try do something with them. I've got a solar panel which puts out ~22vDC @ ~2Amps ...
2
votes
3answers
101 views

Do tool cross-manufacturer battery adapters work without damaging battery or tool?

I'm talking about something like this which allows you to use a Dewalt battery in a Makita tool. Since this is just a question of connecting pins and so on, and no change of current or voltage is ...
2
votes
3answers
353 views

Is it safe to use a battery charger to test the capacity of a non-rechargeable battery?

I have this battery charger at home. It has a voltage test function. I also have a lot of non-rechargeable batteries lying around. Is it possible and safe to use the charger's test function on non-...
2
votes
2answers
16k views

What does it mean if my Watchdog backup sump is flashing “Add Distilled Water” even with brand new battery?

I just went through the laborious process of setting up a replacement backup battery for the Basement Watchdog backup sump pump system. I had to pour the battery acid in myself. Now in addition to ...
2
votes
3answers
62 views

How can I lift the latch of the battery compartment in this smoke alarm detector?

First of all, I'm a bit embarrassed I cannot figure this out myself. I have looked up Youtube videos, Google searched but I didn't find any exact video. Plus I have tried pressing it hard, lifting ...
2
votes
2answers
114 views

Options for Running High End Computer on Old Circuit

I'm preparing to build the computer of my dreams. Unfortunately, it's going to top out at 1350 Watts when running at peak performance. I live in an 80 year old bungalow and the power situation is less ...
2
votes
1answer
469 views

How can I figure out cordless drill terminal polarities?

I just got this Black and Decker SS18 drill and wanted to run it with my existing batteries but the drill has no polarity markings. Anyway to figure out which terminal is which?
2
votes
4answers
180 views

How to mitigate voltage drop?

I currently have a sump pump in my basement that is normally powered by plugging it into an outlet. When we lose power, I have a 100 amp hour marine deep cycle lead acid battery along with a 1200 watt ...
2
votes
1answer
680 views

Charging a battery with a solar panel

I want to light a cabin. I have the following: 75w 12V Coleman solar panel (two bare wire ends) Large car battery from a Jeep Even larger (boat?) battery - an Optima Yellowtop 34/78 50/10/2A 12V ...
2
votes
2answers
947 views

Solar panels and batteries as primary, grid as backup with auto transfer switch [closed]

I've been toying around with this idea and I'm not sure if it's feasible. I live in an area where the power company has recently adjusted rates to make grid-tied net metering rooftop solar ...
2
votes
1answer
244 views

Battery backup system for tankless gas water heater (outdoor install)

I have a Takagi T-K3-SP tankless gas water heater, which is installed outdoors. It still needs electricity though, so when I lose power at home, there's no hot water. The manual states it uses 86W ...
1
vote
2answers
453 views

How can I make my home internet router work with a battery?

I have an ZTE zxhn h108n router, which needs an 12 V input. I want to make it work when the electricity goes off.
1
vote
4answers
175 views

Sizing up a battery bank for max continuous power draw

EDIT: on hold while I check conditions @Harper pointed to the fact that my battery is rated to draw 165A continuously for an hour, which should cover the needs of my inverter when my vacuum starts up....
1
vote
4answers
210 views

Is Having Multiple Charge Controllers on a single 48V System/Battery Bank a “Bad Idea”?

I have a 48-volt renewable energy power system in my house that is presently off-grid. It has: - a 6kVA inverter/charger that can connect to a generator or the grid (charge controller #1) - a 2kVA ...
1
vote
1answer
1k views

Is use of a deep cycle marine battery indoors safe?

I have a backup sump pump, a 12V "Basement Watchdog". However, immediately after installing it, I found the battery was basically dead. Not wanting to buy a very expensive replacement battery, I got ...
1
vote
1answer
125 views

Making a Solar Power Battery Backup Unit

Ok, so this is a small battery backup unit. I want to just start small and see if I can get the idea working. I'll buy this 20 watt solar panel with charge control http://www.amazon.com/20W-12V-...
1
vote
2answers
1k views

Something is beeping in my house intermittently. It is not the smoke or carbon monoxide detectors! [duplicate]

We are having a very infrequent beep occur in the house. It lasts about one second and then stops for a long time, about once an hour or so. I can't tell what direction it is coming from but we have ...
1
vote
2answers
56 views

Portable battery using this adaptor spec

What is this battery pack inserted here at bottom? I have this adaptor powering a 5V equipment. I need a portable battery. What is the most reliable one that can produce 4A, 20W? I can't take ...
1
vote
1answer
135 views

How should I connect my solar panels to each controllers for optimal performance (series or parallel) without buying new charge controlllers?

I have 4 355w solar panels and 3 315 w solar panels. I have a 40 amp mppt and a 30 amp mppt charge controllers with 100v Max pv voltage. The distance solar panels to charge controllers is around 15 ...
1
vote
1answer
86 views

What can I use redundant/spare AGM batteries for?

In my off-grid cabin I currently have a single 258 Ah (C24) Concorde PVX-2580L battery, with a 150 Ah spare (and generator) for backup situations where the main runs flat. As I frequently see the ...
1
vote
1answer
64 views

Would a single section of 3 LED's from a LED strip still need the required 12V?

I have some LED strips which run off a 12V power brick, but what I don't know if that applies to even a single section which is only 3 LED's? I was basically wondering if there was a way I could cut ...
1
vote
2answers
2k views

Which batteries are compatible with the DeWalt DW9107?

I have a DeWalt battery charger model# DW9107. Which batteries can I charge in it? It says 14.4volts I have a DeWalt hammer drill model# DCD950B. Will the battery for it, DC9096 work with my ...
1
vote
1answer
344 views

Can I use Eneloop batteries in my thermostat?

I have this LuxPro thermostat http://www.luxproproducts.com/pdfs/spec_pdfs/PSD010Bc_NL_ENG_Manual.pdf There's a warning in the very first section that says to use only Duracell or Energizer Alkaline ...
1
vote
1answer
76 views

Proper amount of solar panels needed to charge batteries

I am working on a plan for a 24V electrical system. Based on my needs I plan to have six 12V 100Ah LiFePO4 batteries wired up (2S3P I believe) to give me 24V 300Ah. Assuming I need to fully recharge ...
1
vote
0answers
56 views

i'm having trouble with battery not charging

I think I have a battery going bad. Charged over nite and light read charged. but in the first 15 mins it died on me how long does it take to charge a hitachi battery 18v
1
vote
0answers
35 views

Using excess energy during float phase - am I using up my batteries' cycle life?

I have a hybrid power system: 3kW solar; 2kW wind turbine; 1kW water wheel, that feed a 48v (flooded lead acid) battery bank. Presently, after absorption charging is complete and the system goes into ...
1
vote
1answer
2k views

Can I connect a battery reserve to my solar attic fan?

I have recently purchased a solar powered gable fan for my attic. This fan will only work when the sun is up, but I would like a little more out of it during the early evening hours (no sun). Is ...
1
vote
1answer
2k views

Wiring a Tesla Powerwall into an Existing Solar Install

I've been looking at the cost and feasibility of augmenting my existing 5kWh solar install with battery-backed storage to shift usage of the solar power that I generate to more useful times of the day/...
1
vote
1answer
6k views

Ryobi 18v. Lithium says fully charged but no energy

Recently I was using a Ryobi cordless drill to work on some drainage equipment. Unfortunately it caused a spill and a little water got on me and the drill. I did not think it was a lot of water (and I ...
0
votes
2answers
48 views

How to complete this circuit

I got some decorative multi color led wire. It is broken at one place now. I need to connect the wire to complete the circuit. I am new to this and I am trying to learn. I tried twisting the wire so ...
0
votes
2answers
85 views

Where to get solid aluminum “battery” replacement cylinders? [closed]

I once saw an ingenious setup while doing work for a state agency. A contractor created a "black box" that contained a Canon camera in it for photographs that normally needed batteries in both it and ...
0
votes
1answer
154 views

I soldered 2 AAA batteries together in series but am not getting double voltage [closed]

I'm sure this is rudimentary, but I'm very inexperienced in anything practical with electronics. Would like to try to get a 3volt battery go run some LEDs. I thought I could just take two AAA ...
0
votes
3answers
110 views

How big of a Battery Backup or powerwall do i need to power 3 medical devices

I have two CPAP's and one Oxygen concentrator. I would like to power when the power goes out. The sticker on the oxygen machine says 3.4 A. The CPAP's are identical ,models and the stickers on the ...
0
votes
3answers
989 views

Sump pump battery backup

I currently have a sump pump in my basement. I recently lost power during a rain storm and had to pump water out by hand until power was restored so I am looking to install a battery backup for the ...