Please specify the battery type in your question. Include chemistry (e.g. lead-acid), voltage, number of cells and how they are connected (series or parallel), capacity (in A·h or W·h).

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-2
votes
0answers
40 views

Should I keep my notebook connected to the AC adapter all the time or “excercise” the battery for long lasting battery life [on hold]

I have a Dell 7537 and I want to keep the battery in good shape. I have not found a clear answer as to how I should treat the battery. Most of the time I use my notebook indoors and connected to an ...
2
votes
1answer
37 views

What can be the consequences of charging a lead-acid battery with an excessive voltage?

In my field-operating device I use a simple PWM step-down to charge a 6V 3.9Ah lead-acid battery from a 5W solar cell with a voltage of 7.2V. Unfortunately the DC regulator got damaged today and the ...
-2
votes
1answer
41 views

Is it bad to charge an iPhone 5S with an iPad Air's charger? [closed]

Often in the little leaflets that come with chargeable electronic gadgets, manufacturers state that you should only use the original supplied charger to charge the gadget. We all know that an iPhone ...
-1
votes
0answers
33 views

Implications of directly using powerbank on mobile? [closed]

I have Nokia 6600 which is antique and I wanted to experiment with it. We get powerbanks to charge on the go which has an internal battery... Is it okay, to connect a powerbank (and perhaps solder it, ...
0
votes
1answer
38 views

Battery recharging via solar panel

I am trying to use rechargeable batteries. If I recharge two of the below batteries via the solar panel below, how many hours will it need to recharge to 100%? Likewise, what if I recharge four ...
1
vote
1answer
60 views

Possible to charge a LiPo battery with a 3.5mm headphone cable but also send/receive data?

If I have a device (Device A) that is plugged into a 120v wall outlet, and is connected to another device (Device B), that has a small LiPo battery, via a 3.5mm headphone cable (consider this a ...
0
votes
1answer
61 views

How much/fast is a battery allowed to degrade? [closed]

My friend's Macbook Air battery has degraded almost 21% in just over 2 years. This made me wonder how much a battery is "allowed" to degrade over time. Is 21% in 800 days a lot? Or does it seem like a ...
0
votes
0answers
30 views

Electric vehicle battery balancing

I need to choose a method for my project in for active balancing of Li-Ion batteries for EV application. I read a paper for this purpose: "A Review of Passive and Active Battery Balancing based on ...
2
votes
1answer
45 views

Hoover batteries, sensors and charging

I have a battery for a robot hoover (aka vacuum cleaner) (Ni-MH) that seems to be on the blink (very low run time). I'm trying to understand how it works in case I can do anything to fix it or if I ...
0
votes
1answer
28 views

Is the float charging voltage the same as the maximum healthy open circuit voltage?

In my case I am looking at the Hoppecke OPzV (product page) lead acid batteries. In the two page Operating Instructions (link) it says 2.3 Maintaining the full charge (float charging) ...
0
votes
1answer
56 views

Battery charging time [closed]

I've got a 800 CCA 110 RC car battery that I want to try hooking up to a 12 V 225 Ah battery so as to recharge it without having to use a wall charger that's suppose to take close to 2 weeks. I've ...
1
vote
2answers
57 views

Recharging dissimilar batteries

I have a lot of Eneloop batteries and am very happy with them. However, many of my devices, annoyingly take an odd number of batteries, but the Eneloop charger only charges in pairs. How bad is it ...
3
votes
3answers
90 views

Connecting a higher-current power supply to a lithium-ion charger will damage the battery. Why?

I am not asking how the battery gets damaged, because that answer is straightfoward. What I am asking is why lithium-ion chargers allow batteries to be damaged by excessive charge current in the ...
1
vote
4answers
93 views

Do cells phones put out a signal when charged through data out?

Do cells phones put out a signal when fully charged through data out? I am wondering this because there is a competition to see who can build the best and most efficient portable cell phone battery ...
0
votes
1answer
60 views

Can my dead Lead Acid batteries be reused?

I have two 12V 4.5Ah sealed Lead Acid batteries from an old electric scooter. The scooter is a decade old, and packed up a few months after purchase. The batteries were literally left as is for ...
-1
votes
1answer
57 views

How to fix exposed wire at the end of a laptop charge with electrical taper [closed]

I have a Toshiba L505D-S5965 with Windows 8.1. My charger has exposed wire at the end but it was working until a few days ago. It's at the part where it's plugged to the laptop charger port. Now it ...
0
votes
1answer
115 views

Charging Li-ion batteries in parallel

I wanted some opinion on my set up here, just to make sure I got the basics right. I have a Li-ion battery charging circuit based on the MCP73113. This is designed to be a single-cell battery ...
0
votes
2answers
70 views

Solar panel system with as minimal reliance on the grid

I am not sure if this is the best place to ask, but I am trying to make a solar panel system which will charge batteries with excess energy and will be connected to the mains (i am going to try the ...
0
votes
2answers
36 views

USB li-ion charger with usb output

I would like to power my robot with li-ion batteries. The logic is 5V so I thought about something like this http://www.powerstream.com/n-charger.htm. This does exactly what I want - it is charged ...
0
votes
3answers
95 views

How can I make a safe Ni-MH charging station?

I wanted to make a docking station for my robot. My idea was simple - robot drives in, batteries are disconnected, pins that I attach to my Ni-MH charger's electrodes are inserted into battery pack, ...
0
votes
2answers
82 views

How is this 3 VAC power supply charging this 18 VDC battery? [closed]

My cheapo 18V Black and Decker cordless drill recently died, and thinking I could maybe fix it, I took everything apart and then couldn't figure out how it was ever working in the first place! Here's ...
0
votes
2answers
78 views

Differences between 5V DC 350ma vs. 450ma [duplicate]

I have two A.C adapter chargers giving an output of 5V DC 350mA and the other one with 5V DC 450mA. Is it possible that I could ...
1
vote
1answer
33 views

Using current measurments for smart charging a battery

I've been doing some reading on smart charging a battery, and I hope to create a system that can charge batteries with the use of a solar panel. Most of the reading I've encoutered utilises the ...
0
votes
3answers
81 views

Can I use + charge 3 LiPo cells in series with 3 separate charge controllers?

I'm looking at this circuity from SparkFun. It's an mppt + LiPo charger, which is exactly what I need, but I need several cells. I'm actually fairly content to just build 3 of these, and wire each in ...
1
vote
2answers
54 views

Charging NiMH Batteries

I'm wondering if MAX712 would charge 4 Eneloop batteries in series. I don't know if it will charge them safely and if it will charge them the correct way. How much voltage will need to be provided to ...
2
votes
1answer
56 views

How to keep rarely-used Li-Ion batteries functional?

I have many gadgets around the house that I don't use often, recently I notice that a battery failed on an Mp3 player not used for a year. The battery now has a life of 1 minute from the original 5-7 ...
2
votes
1answer
155 views

Charging 10 1.2V nicd batteries

I have 10 x 1.2V Sanyo NiCd batteries. They are connected in series. I would like to charge them. The thing is, I don't have a charger. I looked up chargers and they are all quite expensive(I live in ...
0
votes
1answer
92 views

Charging batteries in series when they are connected in parallel in the circuit

I'm new to electronics and I'm trying to build a charging circuit for NiMH batteries. There are four batteries in total. Two are in series, and the other two are in series. Then these are connected in ...
1
vote
1answer
65 views

Question on 3DS power adapters, minor voltage difference [duplicate]

I am going to be traveling overseas and bringing my Nintendo 3DS which the adapter outputs DC 4.6V 900mA. I found an unofficial USB cable to charge it and I was curious if the minor variance in the ...
0
votes
0answers
68 views

Effective power circuit for currents up to 1.5A and with battery charger (PMIC or not to PMIC?)

For my ARM-based (A10) device I need to create power circuit. Input voltages: 5-28V, may be charging from USB. Output voltages: 5V, 3.3V, 1.2V, maximum output current -- up to 1500mA, working current ...
0
votes
0answers
38 views

Automatically changing currently used and charged deep cycle batteries, any problem?

I don't know the internals of commercial solar deep cycle battery chargers, though mostly what I see in home made ones is that a regulator circuit is connected to battery, and when you want to use the ...
0
votes
1answer
44 views

Lengthen charge times with batteries

Would replacing a 3.7v 1000mAh lithium ion battery with a 3.7v 5000mAh lithium ion batter make my projects last longer between charges?
1
vote
1answer
45 views

BQ2407x Li-Ion charging circuit, what if Vin is disconnected?

We will use a Texas Instruments BQ24072 in our power board to monitor the battery. -PoE or solar will charge -Most of the time, circuit will work on battery. When disconnection the Vin, one would ...
2
votes
3answers
191 views

How do USB charging and “smart” charging ports (e.g. Anker's PowerIQ) work?

Software engineer with a hobbyist understanding of EE here. I've noticed lately lots of claims from producers of USB battery packs that their ports are "smart" and "identify the device" to "deliver ...
0
votes
1answer
49 views

Faster charging of Lithium Polymer battery possible?

I am designing a system which needs to run for 3 minutes, then charge as quickly as possible, then run for 3 minutes, then charge as quickly as possible, and so on. In order to reduce the charging ...
0
votes
0answers
61 views

Designing an Automated Switching System for Solar Battery Charging Station

I am trying to design an Automated Switching System for my Solar Battery Charging Station project. In the project a 48V battery rail is charged with two 200W panels connected in series through a PWM ...
1
vote
2answers
80 views

Why one transistor switches on first than other

In the circuit diagram given below we have two transistors. And in the article it is given that one transistor will turn on first. Why this transistor turns on first
2
votes
4answers
246 views

Need help explaining this circuit and how it is dimensioned and designed

I'm working on a project to school where I'm designing a battery charger with battery status indicator, and I found this circuit online: but to include it in the project, I must explain how it ...
2
votes
0answers
71 views

Li-ion battery calibration technique

As you know the li-ion batteries have flat voltage curve and it is not possible to detect battery state of charge (SOC) from voltage accurately. We use fual-guage which measures the accumulated ...
1
vote
2answers
95 views

How do phones charge their battery at seemingly any rate with no issues? 500mA or 1A or 1.2A depending on the charger?

If most use some sort of li-ion battery, and those batteries like to be charged in CCCV format how can my phone charge just fine at 5V, 500mA or 5V, 1A or 5V, 1.2A just fine (actual current delivered, ...
-1
votes
1answer
178 views

Charging battery using computer power supply?

I have new 600W ATX computer power supply unit. I have wired green and black together to make power supply turn on when plugged in. I wanted to charge my 12VDC empty battery, without dealing damage to ...
1
vote
2answers
93 views

Watts in Solar Panels

How does the amount of watts affect a solar array? The solar array I found is 14 W, so what would I encounter if I purchased an lower/higher wattage? I'm going to purchase an array to charge my ...
-1
votes
1answer
83 views

What do B+ and C+ mean on the wires of a Lifepo4 battery pack?

I bought this Lifepo4 battery pack. It came with its own charger. The seller told me the charger can be connected directly to the battery. There are 4 cables coming out of the battery: C+, C-, B+ and ...
0
votes
1answer
107 views

How can I modify the charging circuit of the solar powered system using super-capacitor with or without battery (diagram is attached)?

I 'm working on a device which according to the below diagram, has a solar panel witch gives at most 10v voltage and 30mA current (average 9v and 20mA) and also it has a 6v lead acid dry battery with ...
0
votes
1answer
71 views

Solar panel & battery math verification

I'm looking for confirmation to see if this battery and this solar panel will cover my needs for a remote timelapse project I'm setting up. The timelapse will run 6 days a week for 9 hours. My area ...
0
votes
1answer
57 views

Can someone tell me if this topology for a crude battery charger is sound? Block diagram included

I am making a portable phone charging battery for fun. I have a micro USB input that ties to a 5V - 4.2V buck converter to charge a li-ion battery. The IC is made to charge batteries so I think that ...
2
votes
2answers
162 views

Effects of continous slow charge on a battery?

If you connect a solar panel to a phone battery, but the solar panel provides about 1/4 (or 25%) of charge (mA) compared to the battery's original charger. Will this slow power charge the battery ...
1
vote
2answers
113 views

DC-DC converter to drive DC motor

In a robotics application I have to install a 12V (30A) DC motor actuator in a vehicle. The typical setup indicated by the manufacturer is to directly connect it to the battery, because of inrush ...
0
votes
0answers
49 views

Equations to charge a lead acid battery with constant voltage strategy

Typically there are 3 zones to charge a lead acid batteries.In the first step, the battery would be charged with a constant current and after a specific SOC, constant voltage strategy would be applied ...
2
votes
1answer
122 views

Temporary, high-power energy storage

I'm currently building a small, portable human-powered charger for supplying a 1W led. I salvaged a dynamo core from a torch, but I'm unable to use other components inside since the torch is only ...