Questions regarding Li-ion batteries (Lithium-ion), including proper charging and usage.

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3
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1answer
72 views

CR2032 vs LIR2032 vs Capacitance Battery

I have an Android TV Box device that does not retain the date and time. Turns out there is not real time clock backup (RTC battery). There are 3 options to solve this. Capacitance battery CR2032 ...
-1
votes
1answer
28 views

Custom Li-ion Power Bank for Surface Pro 4 and Smartphones [on hold]

I'm building a Li-Ion power bank to charge a Microsoft Surface Pro 4 and for general purpose USB charging. The Surface AC power adapter output is 12v 2.58A. Depending on my battery configuration, I ...
0
votes
1answer
26 views

Finding the resistance to charge/discharge for a LIFeMP battery

I am trying to run an automotive systems simulator (ADVISOR) in Matlab, and I am having some trouble regarding my Energy Storage Unit. I am currently trying to simulate my system with a Valence U24-...
2
votes
0answers
49 views

Laptop battery pack rebuild; what cell discharge rate?

Currently I am looking for eight new 18650 battery cells to rebuild my iBook G4 (A1055) battery pack. Because I can't find for what discharge rate the original cells are rated, I'm not sure which ...
0
votes
1answer
41 views

Li-ion battery charging and usage

I have a project in mind based around a Raspberry Pi Zero. The case I am using has slots for two AA batteries so I thought I would use some of the AA sized Li-ion batteries. The batteries I want to ...
2
votes
1answer
216 views

Go around short circuit protection

I recently bought a lithium-ion battery that has a built in protection for short circuit. I want to power a thermoelectric cooler with it. But when i connect it to the battery it seems that the ...
0
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0answers
45 views

Relation between battery cell capacity & internal resistance

I'm trying to design a large battery pack, that should provide a given amount of power, with a reasonable amount of heat dissipations. To do so, I have three degrees of freedom: indidividual cell ...
1
vote
1answer
59 views

Is this a good layout for BQ40Z60-based battery management unit?

Could you please take a look at board layout and tell is there some stupid mistakes. I tried to accomplish the following characteristics: Max discharge current: 10A Max charge current: 5A Charge ...
0
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1answer
38 views

Li-ion and Lipo battery in parallel connection , can they work simultaniously?

I have a Li-ion battery(3.7V and charging Voltage 4.2V, 1800mAh) and I bought a Lipo battery(3.7V and charging voltage 4.2V, 2500mAh) for my smartphone. And I want to create a homemade battery case. ...
-1
votes
1answer
37 views

Simple 3 cells 12V lithium battery charger design and concept

I needed a simple 12V portable power supply for my high frequency inverter, and I have built one before, but yesterday, when I try to use it, the power is out. The batteries are low. SO I took it ...
1
vote
1answer
57 views

How to design a small solar panel and the respective li-ion battery charger IC?

I'm designing a small solar charger with these characteristics: Solar panel with 19% monocrystalline cells Voc = 7,50V Vmp = 6,00V (Voc -20%) Isc = 1,07A Wp = 6,42W IC Microchip MCP73871 linear ...
0
votes
1answer
25 views

Limiting or reducing current to charge low-capacity lithium batteries

I have a handful of lithium-ion batteries with very low capacities, the lowest being about 700mAh, which I wish to connect to a charging module to avoid having to physically take out of my device/...
1
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0answers
35 views

What is a good melting point for a lithium battery contact fuse?

Tesla uses a fuse on every battery for their cars, and many fusible alloys melt from 50 to 90 degrees. because the fuse is welded onto the battery it wouldn't matter what the fuse current was, you ...
0
votes
1answer
37 views

Bipolar Li-ion battery charger

I'm currently designing a small application with a bipolar power supply. As the circuit needs to be portable, I've included two Li-ion batteries in series with the midpoint grounded to generate the ...
0
votes
1answer
37 views

Usb battery charging

I am designing a system which has a mcu (with usb peripheral). The whole system is powered by a 18650 Li ion battery. Now, imagine I am charging the battery by plugging the usb to a computer usb ...
-1
votes
1answer
51 views

Can I put a 4500 mAh 18650 li-ion battery on a 2600 mAh powerbank?

I recently bought a mobile phone powerbank without realising that the battery wasn't included on the kit. So now I need to buy a 18650 li-ion battery and I found one that has 4500 mAh. Can I put the ...
0
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0answers
60 views

Is it bad to put 3.7V on 3V mice? [migrated]

I have mouse that take two AAA batteris, so it take 3V. Is it OK put one 10440 of 3.7V and one spacer instead?
0
votes
1answer
23 views

Recommended BMS for 18650 lition 7S 24V Battery Pack

I want to build a 24v 7S 3.7-4.2 18650 lion pack. My concern is the parameters my BMS should have to keep in balance all the 7 cells, not over charge them or over discharge them. cells from laptops: ...
0
votes
2answers
45 views

GoPro Hero 2 Battery Elliminator? (3.7v versus 5v)

I have an old GoPro Hero 2 who's external USB plug has failed, and I have no way of powering it externally. I need to run this GoPro using an external wired power source (available over a 5v USB). ...
4
votes
1answer
186 views

Why are 3.8V lithium-ion batteries used in mobile devices, rather than 3.6V or 3.7V batteries?

I've noticed an odd trend in the lithium-ion batteries used in smartphones and tablets: rather than the 3.6V or 3.7V per cell typical of most Li-ion batteries in other types of consumer devices, they ...
0
votes
2answers
76 views

Charging Li-ion batteries at a constant current for a fixed time

I just saw an Ebay Listing for some cheap Li-Ion batteries and a charger that claims to be "safe" yet doesn't seem to have any overcharging protection as such - the charger is supposed to provide a "...
0
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0answers
38 views

Charging NiMH batteries easily

I was planning on building a small rechargeable lamp-of-sorts, however, after exhaustive research, I have learnt only one thing: batteries are complex. I have avoided Li-Ion Polymer batteries since ...
0
votes
1answer
41 views

Charge batteries in series or parallel?

I am using some 18650 batteries in a small project. Since they are lithium ion batteries, I want to implement a charging system. I have some TP4056 1A chargers for these batteries (I know 1A is slow)...
3
votes
1answer
72 views

18650 Li-ion modular battery packs

I was searching around for batteries to use in my personal electric scooter project. I've found some LiFePO4 that has sufficient capacities like: http://en.winston-battery.com/index.php/products/...
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votes
2answers
135 views

Little explosion when removing lithium battery [closed]

Today I removed phone's battery (that not user removable) for replace lcd. When I removed it, There was a tiny spark and after that bad smell (but low). Is it safe to put it back and continue to use ...
1
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2answers
62 views

Lithium Ion Battery Capacity: Discharge Analysis

I have taken apart a battery module consisting A123 Systems ANR26650-M1A cells (they are technically Lithium-Iron-Phospate (LiFeo4) cells) that were used in a commercially controlled environment. ...
1
vote
2answers
43 views

Charge a 6S Li-ion pack with a boost converter

Hi fellow makers and engineers, I'm trying to charge a 6S Li-ion battery pack (6 NCR18650B cells in series) using a rectified DC voltage of 16 Volts and boosting it to about 25.2V to charge the pack ...
0
votes
2answers
49 views

Li-ion battery maximum discharge current testing

I been playing a lot with Li-ion batteries (NCR18650Bs to be exact) and I have a question regarding how to test their maximum capabilities and generate my own conclusions. If you take a look at this ...
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votes
1answer
89 views

Can i charge a 3.8 volt lithium battery with a 5 volt usb or charge cube? [closed]

I did search and read a lot of varying opinions on this site, I'm just trying to get a straight answer. I have an ordinary 3.8v Lithium cellphone battery. I have a USB charging cord for it, but I ...
3
votes
1answer
57 views

Replacing Lithium batteries with larger ones

I have some background with electronics, but that was in the "old days", so my knowledge of lithium battery types and charging processes is very limited. I have a bunch of gadgets with one of those ...
1
vote
1answer
192 views

What are the 8 wires on this rechargeable lithium-ion battery?

I am trying to replace a rechargeable lithium ion battery with one that has a longer lifespan when charged. The one I have has 8 wires, but every one I find has 2. It has 3 red, 3 black, 1 yellow, and ...
1
vote
1answer
40 views

Rest time for testing lipo cells

My university's student electric racing team has to test a large number (250) of lipo cells before using them in our electric car. Our testing methodology will be approximately like this: Discharge....
1
vote
2answers
86 views

How do you tell if a Li-ion battery has a protection circuit?

I bought a li-ion battery off of ebay. The listing claims that the battery has a protection circuit, but a week later, the battery didn't cut out or anything. With a multimeter, it is reading 10V when ...
2
votes
0answers
76 views

Would this Li+ flashlight circuit be considered safe?

I recently got an inexpensive (~$4 USD) Li+ 18650-powered flashlight from banggood.com, one of my favorite sources for inexpensive Chinese electronics to tear down and hack for fun :) I wanted to ...
0
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0answers
135 views

DIY Powerpack 18650 4s3p 14.8V charging

I plan to make a portable audio system with 4 speakers and a subwoofer which are driven by a 12v TDA2030A 2.1 Amplifier. Everything is already packed in a small enclosure (approx. 30x15x30cm) and ...
-1
votes
2answers
57 views

charging circuit for Lithium Ion Battery [closed]

I am going to prepare a 12v battery using 3 18650 Lithium Ion batteries in series. As i am new to these batteries, i read some articles about it. But I'm not clear in charging it. Suggest me the ...
1
vote
1answer
353 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 ...
0
votes
1answer
77 views

DIY battery Pack Cell amperage difference

I have individually tested the capacity of ten 18650 batteries with my iCharger 4010. My question is, how much ampacity difference is ok when packing them in parallel ? The following are the readings ...
1
vote
2answers
59 views

Can I convert L-ion battery backup to supercapacitor?

I have a RAID card in my home server and the battery went dead. It's a lithium ion chemistry with the circuits to tell the RAID card miscellaneous information. I could buy another L-Ion battery to ...
2
votes
1answer
100 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
1answer
43 views

Power to tool vs duration of larger ah batteries

I have a Milwaukee M18 Fuel 18v LI ion cordless impact wrench. It came with a 18v 2.0 ah 27 Wh battery pack. They also sell a 18v 5.0 ah battery pack among others. When reading online some people ...
3
votes
1answer
120 views

How deleterious is topping-off my Li-ion batteries (phone/laptop) every time they drop to 90%?

I have read recently that frequent top-off charging of my personal electronics is hard on the batteries. Specifically, Li-ion batteries in recent model smart phones and laptops will show significant ...
1
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2answers
77 views

Why MCP73871 lithium battery charger IC takes so long?

I'm working on a Microchip IC: MCP73871, a very small linear charger for lithium-based batteries. It has very nifty feature: a load-sharing system that gives priority to the load over the battery in ...
0
votes
1answer
50 views

Understanding Li-ion Battery(ICR18650-26H)

I trying to use a Li-ion Battery in my project. ICR18650-26H is suitable for my project(GPS data logger) I think. I am having hard time understanding one particular parameter in the specification ...
0
votes
3answers
81 views

Looking an IC chip to charge cell phone [duplicate]

I have a DC voltage source (between 5 and 10V) from which I want to charge cell phone with a USB cable. I believe that using a LM317 or similar IC for charging cell phones is not a good idea as most ...
1
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1answer
71 views

5 volt small UPS design (review request)

I'm designing small 5 volts UPS that would allow me to run on battery or 5V source. If source is unavailable, step-up module takes power from battery. If this 5V source is restored, then this source ...
2
votes
0answers
38 views

How to connect capacitors to SIM800C gsm module [duplicate]

I am powering a SIM800C from a 3.7V Li-ion battery. If the battery charge drop below 85% (it still has 4.1V measured without load), the module keeps restarting during startup. This probably happens ...
0
votes
1answer
28 views

Re-attaching Tablet Lithium Ion Battery With DC Power Pigtails

Complete electrical newbie here. Please forgive my ignorance. I have a tablet that gets "circuit locked" or something. It refuses to detect the charged battery. It seems to charge the battery, but ...
2
votes
2answers
83 views

Should you plug your device in more frequently and wear out the MicroUSB port, or let the Li-Ion battery drain more and wear out the cells? [closed]

I would like to know what advice to give the consumer about how often they should charge the device. I read in this answer (and various other places on the net) that MicroUSB ports are rated for ...
0
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0answers
53 views

Lithium Polymer battery puff sensing

I have an IoT application which requires > 20,000 mAh of battery capacity. This can either come from a single cell or a number of cells connected in parallel. The device is going to remain unattended ...