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Questions tagged [batteries]

Hacks related to batteries and other energy cells.

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How do I power two 3W blubs from a power bank?

A friend of mine has a cupboard that includes two 3W light bulbs (the kind that are meant to look like flickering flames in case it makes any difference). There is a wire out of the back of the ...
Avrohom Yisroel's user avatar
2 votes
2 answers
339 views

Can you extract the remaining charge on weak alkaline batteries (AA, AAA, 9V, etc.) to charge rechargeable batteries (NiMH or Lithium-Ion)?

Instead of just disposing of weak alkaline batteries, is it possible to extract the remaining charge to charge re-chargeable batteries? I imagine theoretically you can attach the weak batteries to a ...
Kevin Kaufman's user avatar
0 votes
2 answers
437 views

How to test health of rechargable batteries

I came across this answer How do I test rechargeable batteries? to the question of how to test rechargeable AA batteries and plan to try it. What I am wondering is how to apply this to other types of ...
Bruce's user avatar
  • 1
4 votes
3 answers
293 views

Question on Increasing Longevity of Laptop Batteries

Is it possible to make my laptop charger only charge when the battery is almost dead? Then, once it is fully charged to not activate charging again until it becomes close to dead again? Would that ...
napsareessential's user avatar
0 votes
4 answers
3k views

How can I convert a wireless mouse to USB mouse?

My family received 10 wireless mice in excellent condition for free, but must eschew the hassle and cost of batteries. How can I add a cable to them to plug them into USB ports like USB mice? Please ...
user avatar
4 votes
9 answers
87k views

Use two 2025 batteries instead of one 2032 battery

Intro: 2032 and 2025 are literally the dimensions of the battery. A 2032 is 20mm in diameter, 3.2mm thick, and a 2025 is slightly thinner, at 2.5mm thick. They usually both have the same voltage (...
Danny Schoemann's user avatar
0 votes
1 answer
111 views

Degrade capacity of internal mobile phone battery

After reading this question (https://security.stackexchange.com/questions/65382/is-it-possible-for-a-phone-to-be-transmitting-even-while-turned-off-and-the-batt) on security stack exchange I wanted to ...
CuriousIndeed's user avatar
3 votes
6 answers
282 views

How to improve the life of mobile phone battery?

We all use phones. Sometimes our phone's battery gets low and we have no resources to charge it. What is the best solution for preventing our mobile phone from turning off, while it is in battery ...
Chawlish Boy's user avatar
2 votes
2 answers
4k views

How to prevent NiMH batteries from leaking?

I have a low-power device (2mA max), wherein my NiMH batteries tend to leak. Following the advice of How do I prevent batteries from leaking?, I now have Low Self-Discharge batteries; however, they ...
Alex's user avatar
  • 121
0 votes
2 answers
141 views

Whats wrong with my remote control?

I have this remote control: Sometimes if I press a button the TV does not react - although there is nothing in between that could block the signal between the red light and the remote control: If ...
Adam's user avatar
  • 181
3 votes
4 answers
17k views

How to recover swollen battery?

Many have faced this issue. So this is a general question. I am using a smartphone from last 3 years. Now it's battery is swollen and there is some liquid developed inside the battery. Due to this, ...
Creepy Creature's user avatar
2 votes
3 answers
931 views

How can I replace digital alarm clock batteries without it losing the time and date?

My digital alarm clock takes 2 AAA batteries. Every time that I have to replace it's batteries it loses the time and date. I tried to replace first 1 battery and then the other (so that the system ...
papakias's user avatar
  • 565
3 votes
5 answers
13k views

Changing a smoke detector battery with a too-short ladder

I am a short person (5'1", 154 cm) with tall ceilings (15 feet, 457 cm). I have an 8-foot ladder (244 cm). On this ceiling I have a smoke detector whose battery needs to be replaced. On this model, ...
Roddy of the Frozen Peas's user avatar
4 votes
1 answer
720 views

How to clean a pager charging port

I need help cleaning the connection on a Motorola Minitor (yes, I spelled it correctly) V pager. Basically my issue is that the connection between the battery and charging pins is no longer the best ...
L.B.'s user avatar
  • 995
6 votes
5 answers
2k views

How to extend the lifetime of a rechargeable battery?

Telephones sometimes don't have a replaceable battery, so how do you extend the life and ability to hold a charge of a rechargeable battery in one?
Varon's user avatar
  • 170
7 votes
8 answers
39k views

What can I use to replace a missing battery cover?

I lost a battery cover for my TV remote control. It is similar to the one in this photo. It is a very old model TV so I don't think replacement parts are available. What would make a good substitute ...
LeopardSkinPillBoxHat's user avatar
8 votes
1 answer
865 views

How can I re-seal hearing aid batteries that have been accidentally unsealed?

Zinc-air hearing aid batteries come with a sticky tab on them to prevent air contact; once this tab is removed, the battery starts draining. The instructions warn that "thou shalt not removeth this ...
goldPseudo's user avatar
8 votes
4 answers
861 views

How do I make my smartphone battery last longer?

My phone battery lasts often less than 3 hours. How do I get more life out of it? FYI, it's a 3 year old Apple iPhone 5.
Coomie's user avatar
  • 367
2 votes
1 answer
698 views

Charge nickel cadmium (NiCd) batteries with a nickel metal hydride (NiMH) Charger

I am using a portable wireless shaving machine. It was bundled with a nickel cadmium (NiCd) battery and a cradle + charger. The battery was 1.2v rechargeable one. I can operate the machine with a ...
Kushan Randima's user avatar
9 votes
5 answers
5k views

How do I prevent batteries from leaking?

I have recently bought a battery powered LED lamp for use on a camping trip. When I return I would like to have it ready for use at home when the power goes out. I am concerned that as it will be ...
Kelly Thomas's user avatar
25 votes
12 answers
196k views

How to make my batteries work for a short time, one last time

What would be a good trick to make my batteries work one last time? Right now, I was using my trusty USB wireless mouse and the batteries died, right in a bad time. What is a good way to make them ...
Ismael Miguel's user avatar
12 votes
8 answers
14k views

How can I charge a single rechargeable battery?

I have a battery charger that requires batteries are charged in pairs. However I have a wireless keyboard that uses three batteries. Is there a (safe) way I can charge all of the batteries at once? I ...
James Webster's user avatar
22 votes
4 answers
3k views

How do you test if batteries are good?

I have a huge flashlight which runs on eight D batteries. I gathered the eight batteries, but I'm not sure if they are all good, and I don't really want to test them all. I tried testing them all out,...
michaelpri's user avatar
  • 11.3k
14 votes
5 answers
60k views

How do I know how much charge a battery has left?

I have a box full of batteries (AA, AAA, 9V, and CR2032). I know some are empty because I chucked them in there together with full ones, which was probably not a smart thing to do. Is there an easy ...
Martin Tournoij's user avatar