Linked Questions

2
votes
1answer
4k views

Many-year-old laptop batteries: safe in my closet? For how long? [duplicate]

I have laptop batteries that are a few years old and lost their charges, but which I've still kept "just in case"*. However, I've heard that letting them lose all of their charges can be dangerous. ...
1
vote
2answers
2k views

How dangerous is this broken lithium-ion laptop battery? [duplicate]

The wife’s laptop is an older Macbook with a dead battery (i.e. it wouldn’t charge, but used to run fine when connected to an outlet). With the wife in hospital the thing wasn’t used for a while now (...
0
votes
0answers
43 views

Why lithium ion batteries explode ? (Reason behind it ) [duplicate]

I heard the reason for lithium ion battery explosion is lithium burns when exposed in air but Few days ago I pierced one of my batteries (10-20 holes) and it didn't explode , why ? It was broken phone ...
42
votes
8answers
17k views

Why are car batteries still so heavy?

Back when I was a kid, car batteries used to be huge heavy lumps of plastic filled with lead and acid. They used to weigh almost as much as a mobile phone (slight exaggeration there, sorry). 45 years ...
27
votes
5answers
16k views

Why are Edison screws allowed to be used? [closed]

Why are the Edison screws allowed to be used? They seem unsafe. Why are they designed that way? They require a complete grounding system to ground devices for the rare situation where the hot wires ...
8
votes
4answers
12k views

Why are Li-Ion battery so much safer than lead-acid?

Recently I asked how to charge a (lead-acid) car battery at home and looks like the answer is very dangerous, don't do it unless you really really have to. Meanwhile people charge Li-Ion batteries of ...
9
votes
5answers
6k views

How much can I overcharge a 4.35V LiPo?

I'm building a charger for a set of LiPo cells. My circuit needs to make sure they get fully charged to their maximum level of 4.35V. At the same time, the circuit should protect the cells from ...
1
vote
1answer
2k views

What protection circuits do laptop batteries come with?

I am currently using an old lithium-ion laptop battery pack for my portable sound system. The battery seems to work pretty well for its age. I simply hooked up a cable to the positive and negative ...
1
vote
3answers
3k views

Power Dissipation of Schottky Diode

I am implementing a circuit as shown below :- Source is a 15V Solar panel & Load is the Battery. The intent is that if someone tries to connect a bigger battery on the output, Diode(Schottky is ...
4
votes
3answers
2k views

Light an LED when load is in circuit

I want to have a LED light up when a load is in circuit, and go out when it is not. Initially I set the circuit up so that the LED is in series with the load but this didn't work. I think possibly ...
-2
votes
1answer
3k views

Fuse for a 18650 pack [closed]

Are there any fuses that i can use to protect a 18650 battery pack. I have a 2s8p which is rated at 12.6v 21.6A. one battery is rated at 4.2v at 2700mAh.
0
votes
2answers
8k views

Lithium charge module on NiMh batteries [closed]

Can I use a lithium charge module on NiMh batteries? The charge module has 2 led, one for charging and one for full that I would really like to use with my NiMh batteries.
1
vote
3answers
1k views

How to gauge safety of cheap Lipo batteries?

I see a ton of cheap 12V lipo batteries for sale on Ebay, but other than the mAh rating, I can't find any info or datasheets on how to safely operate them. I'm looking for a good battery to power a ...
0
votes
3answers
2k views

Can I charge a 12v toy with USB? [closed]

I have this small palm sized toy drone. It uses a 'charger' which houses 8 AA alkaline batteries. The charger plugs into the drone and the charger is activated by a toggle switch. I want to replace ...
-1
votes
1answer
2k views

How dangerous are LiPo batteries in phones, laptops, tablets? [closed]

Having recently read this question with its answers it seems like I should never ever charge my phone/laptop/tablet unattended. It also seems like I should always be worried about my devices exploding ...

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