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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1answer
39 views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
1
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0answers
27 views

Why are the charge and discharge rate of Lihium Polymer Batteries different?

I have a 3S 1.3MAH Lithium Polymer battery with a 25C discharge rate, and a 5C charge rate.From what i know, the discharge rate is the rate at which the battery can be safely ischarged( i.e how many ...
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0answers
69 views

How to place thermistor for reading temperature in NiHM single AA cell charger?

I'm laying out a PCB for a NiMH single AA cell charger following the AVR450 Application Note - Battery Charger for SLA, NiCd, NiMH and Li-Ion Batteries but I'm not sure where to place the NTC ...
0
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1answer
41 views

MOSFET Cell Balancing Circuit

I'm designing a simple cell balancing for charging LiPoFe4 cells in series. In order to prevent overcharging, when on of the cells reach the maximum charing voltage, the microcontroller will enable ...
1
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2answers
55 views

Safe Lithium Battery Management

I'm building a device that needs to run from Lithium batteries. I am well aware they need to be charged/dis-charged properly to avoid damage and explosions. To my knowledge a charging system has ...
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0answers
21 views

Disabling a LiPO balancer when not charging

I'm looking at building a solar MPPT charger / balancer based on combining two designs (I'm not confident enough in my hobbyist skills / ability to not burn the house down to design the whole thing ...
0
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1answer
56 views

Charge condition of lead acid battery

I need to monitor the charge condition of an 8V lead acid battery. For monitoring purposes, I used a Beagle Bone Black running Linux. It is also supplied via this battery. The battery also supplies ...
0
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1answer
102 views

Connecting batteries in parallel (concerns)

I have been trying to understand if it is possible to connect two identical batteries in parallel (same: number of cells, manufacturer, capacity, CRate, usage). I want to create a circuit to select ...
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0answers
37 views

Difference in self discharge rate between Lithium iron phosphate battery vs Lithium Polymer Battery

What is the difference in self discharge rate between lithium iron phosphate battery and lithium polymer battery? I have a remote application in which the self discharge rate matters a lot.
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0answers
58 views

AGM Batteries: Comparison of Auto to Marine

Research (links go through to the actual product descriptions, for those who read specs): Diehard AGM Auto Group 34 775 CCA: $153 Diehard AGM "Marine" Group 34 880 CCA: $250 West Marine house brand ...
0
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1answer
80 views

3 Cell Series Li-ION charging with TP4056

I've searched my situation but cannot find my exact answer, I am trying to make 3S Li-Ion battery charger with 3 TP4056 Charger Module. TP4056 Module 1A 5V one cell battery charger i thought if i use ...
1
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1answer
82 views

Why are 5 Volt 7-8 Amps chargers not available for charging phones quickly? [closed]

Available phone s chargers have either 0.5, 1, 2 Amps rating depending on the batteries (varied capacity) used. Why is it that 7, 8 Amps chargers are not available ? if the limitation is in the ...
0
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1answer
68 views

Adjustable charge current from programming resistor for Li-Ion charger - how to change on demand?

I am designing a device which has an integrated Li-Ion battery (single cell, for simple low power portable digital device) and normally charges by way of a buck converter which goes from 12-16V ...
1
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1answer
50 views

How to charge an iPad for maximum battery efficiency [closed]

iPhone chargers provide 5W of energy while iPad chargers provide 10W of energy. If you plug an iPad in an iPhone charger it will charge slower than normal. Also, there are many computers which provide ...
0
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3answers
60 views

Charge 18V battery with charger rated at only 18.5V?

I am wondering if an 18.5V, 3.5A charger be able to charger a 18V battery without any bad side effects? The old charger (not functioning anymore) was 24V 0.2A. I know the charger must have a higher ...
1
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1answer
53 views

Can I wire 6V power packs in series and still use them as individual power sources?

I have 4 x 1Ah Lithium Ion battery packs. These I have two systems, one operates at 5V (usb) and the other requires 20v - 24v. I'm wondering can I power both the 5v system and the 20v system by using ...
2
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3answers
93 views

How big does my wireless charging coil need to be?

Background: I need to wirelessly charge a battery at about 100W. However, there seems to be a gap in the wireless charging market. There are plenty of wireless power transfer systems operating in the ...
3
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1answer
66 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 ...
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1answer
48 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 ...
0
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1answer
45 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 ...
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1answer
77 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
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1answer
65 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
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0answers
41 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
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1answer
46 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
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1answer
37 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) ...
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3answers
78 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 ...
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3answers
119 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 ...
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4answers
98 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
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1answer
68 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 ...
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votes
1answer
83 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
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1answer
276 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
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2answers
76 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
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2answers
41 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 ...
1
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3answers
106 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
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2answers
90 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
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2answers
101 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
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1answer
37 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
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3answers
98 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
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2answers
65 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
67 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
232 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
97 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
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1answer
74 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
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0answers
72 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 ...
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0answers
40 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
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1answer
46 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?
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1answer
50 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
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3answers
357 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
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1answer
65 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
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0answers
82 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 ...