Questions tagged [battery]

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17
votes
1answer
2k views

FirstAlert smoke detector low battery warning continues after opening battery drawer and replacing batteries

Note: I'm creating and immediately answering my own question because I wasn't able to find documentation of this solution online. My condo is equipped with a FirstAlert 7010BSL smoke detector (...
-1
votes
1answer
71 views

Excess inverter noise, low voltage

I'm not entirely sure if this is the best place to put this, but I'm having an issue with a mega-battery I'm working on. The battery is two AGM 12v batteries in parallel, with an inverter stepping up ...
0
votes
1answer
65 views

Okay to use a battery isolator with 2 different kinds of batteries?

I'm considering buying this victron battery isolater and will connect this auxiliary lithium battery and a typical car battery (can find details, but assume non-lithium, non-agm to the alternator (...
-1
votes
2answers
92 views

How to force alarm clock to have the screen always on [closed]

I have an alarm clock, that has batteries and a power cord as a power source. If it's using batteries, it turns the screen off after a few seconds. If it's plugged in, then the screen is on ...
2
votes
6answers
2k views

Multiple small AH batteries vs one large battery [closed]

I finally am making the switch to battery tools. Looking to buy some kits and bare tools as well. I have the option of getting two 1.5AH batteries or a single 2AH battery. In theory this should be ...
1
vote
1answer
27 views

How to turn a Nest or Nest-E thermostat to completely off (no power, no battery)?

Is it possible to remove the battery, or otherwise turn a Nest thermostat completely off, for times when there is no power to the furnace? This is to avoid draining the battery in the Nest completely,...
-1
votes
1answer
36 views

Install battery on honda generator?

I have a Honda generator and I want to install the battery. Somebody else took the old battery out, so I don’t how they did that. The problem is that I only see a gray cable, a black cable, and a ...
5
votes
11answers
2k views

How to make a cap to cover the battery terminals of Ryobi batteries?

Ryobi batteries have a protruding part with battery terminals on it. Here's an example of what the battery looks like. I'm worried that if the battery is stored in a carrying bag with lots of metallic ...
0
votes
1answer
68 views

Electrical Back-up Solution

I have a 350 Watt appliance that I need to run pretty much continuously. An electrical outage of a few seconds isn't a problem but more than a minute or two becomes an issue. So I need a back-up ...
0
votes
1answer
116 views

Same Bosch batteries, but one battery only works in one tool, what can I do?

So, I have some BAT612 18V batteries from Bosch. I should be able to use both batteries with either of my tools (Angle Grinder - GWS18V-45PC, Drill - DDS181A), but one battery works in both tools and ...
0
votes
4answers
228 views

Use a 24V LifePo battery in a UPS designed for lead acid batteries?

I have an existing APC 1500 UPS, designed for use with 24v lead acid batteries and want to know if it would be possible to replace my dead lead acid battery with a 24V Lithium Iron Phosphate (LFP) ...
0
votes
1answer
61 views

Direction of electron in car circuit [closed]

I read this somewhere. "Electrons flow from Negative to Positive. This is called Electron flow. Originally it was believed they flowed from Positive to Negative. This was later found to be ...
0
votes
1answer
135 views

Is it possible to make an "energy harvester" that drains old batteries? [closed]

I am currently looking at my stack of old batteries at home, did some measurements and found that most of them contain at least some energy left. I was then thinking. What is I could make a device ...
1
vote
0answers
56 views

Rocker switch panel wiring

I am looking to wire a boat rocker switch panel to a 12 volt deep cycle battery for my canoe. I have three switched on the rocker switch panel. One will be for navigation lights, one will be for a ...
0
votes
2answers
205 views

Powering battery powered tools from the power grid

I have a number of Ryobi One+ tools that have enough power and quality for me in most cases. They all share the same 18V battery form factor which means that I can invest in 2-3 batteries and use them ...
1
vote
1answer
283 views

Solar Charge Controller and grounding the battery

I am just getting my feet wet, so I have one 100 watt panel and a 12v marine battery. I plan on running a small water pump to circulate water in a black hose to see if I can heat some water. The ...
4
votes
1answer
121 views

How to change battery in garage door keypad?

One of the keys on the keypad for my garage door somehow got a key stuck temporarily and drained the battery. That was easily fixed, but now I am trying to replace the battery. The pictogram seems ...
-2
votes
1answer
66 views

Are the norms for cordless screwdriver charging stations?

So I found this cordless screwdriver at my house but there is no charger for it so I would like to buy a used one for it (it's very cheap so I also don't want to spend a lot of money to buy a new one)....
2
votes
0answers
48 views

"Non-Retail" House Battery

I need a ~3.5kw battery to power an emergency circuit if the power goes down. I've been quoted $13,000 to add an LG Chem 9kw to our existing system but that does not include the inverter upgrade. ...
0
votes
1answer
48 views

Is there a product that allows me to run a "mains" device off a power tool Battery [closed]

I have some fairly large DeWalt 18V batteries, which run, e.g. my Cordless LawnMower. I imagine that they'd also run my Corded tools, at least for a while, if I could connect them up. But I can't find ...
0
votes
2answers
43 views

What batteries are available for powering outdoor LED lights?

I'm trying to build one of these myself (TLDR; It's a lighting setup for outdoor usage to illuminate a pingpong table). I would like to know what sort of batteries are available that might help me ...
0
votes
1answer
70 views

Trying to make a 3AA battery case [closed]

I have requirement to create a device which works on 3AA battery and uses a small enclosure. When all the items are put inside the enclosure, only about 31x31x60 space is left. So all the readily ...
1
vote
2answers
81 views

Can I connect a normal 12 Volt 150AH C10 battery with a solar 12 volt 150AH C20 battery in series for my 24Volt solar system

I have an Exide invamaster 1500imst short tubeler normal battery of 12 volt, 150AH, C10. Now I want to connect this battery with a solar battery of 12 volt, 150AH, C20. Can I connect this normal 12 ...
0
votes
1answer
85 views

Unplugged alarm panel - battery died - keypad says low battery

I have a honeywell alarm panel that I believe trickle charges a 12v 4ah casil lead-acid battery. The panel and battery are ~2 years old. It was unplugged while doing a drywall repair and the battery ...
0
votes
1answer
119 views

Prototype: 12 DC car battery to power standard 120 VAC hand tools

Objective: Today I power my tools (drill, circular-saw, reciprocal saw etc.) in my shed by running a power line from my house. I wish to install solar power panels on my shed; however, before I do ...
2
votes
2answers
157 views

Battery bank in parallel/series or series/parallel

I'm trying to help some friends who live in a remote village in Africa to get the best out of their solar installation, and I'm trying to understand whether there's an optimal way of hooking up the ...
0
votes
2answers
175 views

Spark/Arc observing while connecting battery to charge controller [closed]

I have the solar system as shown in below diagram. When I connect my battery terminals to the MPPT charge controller, I am observing an arc immediately and due to which I am afraid to connect. Does ...
1
vote
3answers
1k views

Battery Backup for 240V (USA) Water Well

I have a well pump. I want to build out a battery backup (and, eventually, charge the batteries with solar and, more eventually, move to solar full time). It's 1/2 horsepower on a 240v circuit. It's a ...
0
votes
3answers
3k views

Why do well pumps need 240V when the wattage is not that high?

I want to be able to power my well pump from a battery when the power goes out, but I am learning that well pumps are heavy duty, running at 240V high voltage, even though mine is only 3/4 hp, which ...
1
vote
1answer
53 views

What's the difference between XX Volt and XX Volt MAX on rechargeable lithium ion batteries?

I was looking at battery power tools and their different battery voltages. Some of the voltages are listed twice, with and without "max". An example for mowers is "40-volt" and &...
0
votes
2answers
456 views

Can I configure home battery power like a UPS - where it constantly self charges and auto transfers?

A simple UPS (uninterruptible power supply - like APC, cyberpower, etc.) will charge itself while simultaneously powering the loads on the other side. If utility power is cut, the batteries will ...
0
votes
1answer
39 views

Bsmnt Watch Dog Battery Flashing "Add Water" but the water level is to the line

I have Basement Watch Dog Special. The "Add Distilled Water" alarm keeps coming on. The water level is to the line and the probe is submerged. I measured the specific gravity of each cell:...
0
votes
2answers
342 views

How do I improve specific gravity in a 4 year old battery

The specific gravity indicates almost nonexistent acid level. Barely above water. What is the best way to bring this battery back to life. It is a 6 volt solar battery.
0
votes
2answers
100 views

System to charge 24V lead-acid battery from a 12V lead-acid battery [closed]

Our garage has no mains connection, but it does have a 12V leisure battery charged from a solar panel, connected to an inverter to produce 240V AC. That mainly gets used for charging a mobility ...
2
votes
3answers
177 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 ...
0
votes
1answer
63 views

Should I wait for my inverter alarm to know when my battery is discharging beyond safe level or should I shut down the loads sooner?

I am using a flooded deep cycle lead acid 24v 450ah battery bank. I don't want to discharge them beyond safe levels so they can last longer. I don't know how to check the state of charge. I have a ...
0
votes
2answers
94 views

Will it damage my batteries?

I have two solar arrays which totals close to 2 kw that I use to charge a 24 v 450 amps flooded lead-acid battery bank using 2 mppt charge controller of 30 and 40 amps. Will it damage the battery by ...
2
votes
1answer
2k 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 ...
2
votes
3answers
937 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 ...
-1
votes
3answers
578 views

12v light amperage

Say i have a 12v light bulb that is 40 watts that can hook directly to 12v battery. I want to know if hooking it directly to the battery uses more amperage than if i were to hook my power inverter to ...
1
vote
1answer
119 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
2answers
17k 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 ...
2
votes
2answers
261 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 ...
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 ...
1
vote
1answer
307 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 ...
0
votes
2answers
82 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 ...
12
votes
8answers
5k 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 ...
1
vote
4answers
526 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
1answer
342 views

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

I have four 355W solar panels and three 315W solar panels. I have a 40-amp mppt and a 30-amp mppt charge controller with 100V Max PV voltage. The distance solar panels to charge controllers is around ...
0
votes
1answer
97 views

Calculating Battery Size for 2 Channel NVR Security Camera System

I need to install a security camera system on a United States 110v power circuit that is only on a night. The circuit is using an astronomical clock to turn on power and more accurately measure the ...