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).
0
votes
1answer
24 views
Two PRT-10401 LiPo Chargers in Parallel
I have one of these charging this battery but it's taking forever. Is the below diagram a good idea or is it dangerous/a better way.
(also please feel free to criticize my diagram. I am trying to ...
1
vote
2answers
39 views
Using ptr-10401 LiPo Charger on a 24.8 Whr battery
I just got in a LiPo charger (ptr-10401) and I want to use it to (yes I know slowly) charge a 24.8 Whr Lithium Polymer battery.
My question is pretty simple. Does this device contain the required ...
3
votes
1answer
93 views
Charging 12v batteries with direct connection to 20v solar panels
I want to charge a 12v Sealed Lead Acid car battery off of a solar panel (20v) and then draw about 10-20W of power from it via an inverter (the load).
I'm wondering if its okay to connect it ...
-1
votes
2answers
86 views
Solar panel not charging battery [closed]
I posted a similar question a while ago and got the answer I thought I was looking for but I now have a new multimeter so I'm able to get readings that should be of some use.
I have a solar panel, ...
2
votes
2answers
79 views
add a rechargeable lipo to arduino micro project
I'm somewhat confused by the various options, hoping someone can clarify which breakout board I need. I want to build a prop that drives a bunch of neo pixel sticks. It should:
have a rechargeable ...
3
votes
1answer
139 views
Adding a battery backup to a circuit with external power supply
I want to add a LiPo rechargeable battery backup to an existing RTC circuit, but I can't alter the preexisting circuit. Basically, the regulator, D2 and RTC (Existing Circuit) are all fixed and can ...
1
vote
1answer
72 views
Why isn't the solar panel charging the battery?
I have a solar panel, a battery and a charge controller. I didn't pay for any of it so I thought I would just wire them up and see how it goes.
The battery won't charge. The charge controller has a ...
3
votes
1answer
99 views
Charging batteries - what should I know
So I want to learn about batteries and the process of charging them.
As a project, I'm going to create a solar powered charger to charge a 9v NiMh battery with 175mah capacity.
I have a 15v solar ...
4
votes
2answers
123 views
Understanding Two MOSFET with sources connected
I am having problem understanding how this MOSFET configuration (used in battery charger) works?
In this slide,
what does it mean "blocking voltages in both directions while allowing ...
1
vote
1answer
179 views
Using super capacitor alternative to battery as a backup power for laptops
I'm interested building my own battery pack using a series of super capacitor, something like this : http://youtu.be/z3x_kYq3mHM
I plan to use it as a power backup solution for my laptop. Based on ...
-1
votes
0answers
71 views
Unable to understand how to use bq27200 (i2c)
I am working on getting a Raspberry pi to communicate with a bq27200 ("SINGLE CELL Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS").
I not sure I am using the correct method to ...
1
vote
1answer
74 views
How do I charge this battery?
I'd just like to preface this by saying I'm a complete newbie with electrics, so please bear with me.
I just went out and bought a battery pack for my RC Car controller as well as a balance charger. ...
1
vote
0answers
86 views
Solar Powered MintyBoost
I've decided to try and make a Solar Powered MintyBoost. I've drawn up a very rough version of a schematic:
As you can see, I plan to use a solar cell to charge a set of 2 D batteries (in series), ...
1
vote
1answer
112 views
Solar-powered Li-Po charger + Arduino
I have an outdoor arduino project I'd like to power with a battery + solar panel. I'm a bit of an EE n00b, so would like to make sure I've got the basics right.
I'm using a 3.7v 1800mAh LiPo battery, ...
2
votes
2answers
96 views
Make a Solar Powered USB Charger
I'd like to make a solar powered USB charger, to charge my phone. I'd ideally like to use (a) solar panel(s) that I can 'mount' onto a canvas messenger bag, and use a pocket to hold my phone. ...
0
votes
0answers
53 views
What is the best rechargable battery for very low and variable current input?
Any recommendations for a battery that will last 5+ years, will have low self discharge, and will be able to charge off very low current inputs (10s of uAs)? It will be running a circuit designed for ...
0
votes
1answer
47 views
Adding AC adapter to solar powered device
I have a solar-powered LED number display whose rechargeable batteries have apparently died. I'd like to hook it up to AC power using a 3V adapter (i.e., cutting the leads from the batteries and ...
0
votes
2answers
67 views
Time of charge of a battery
Given a battery with a certain capacity C (in Ah) and given a certain charging current Ich (in A), how I can calculate the charging time?
0
votes
1answer
95 views
Solar battery charger based on LT3652
I realized a solar battery charger circuit based on LT3652. Actually it doesn't work well, but I think I made some project error. In fact it doesn't reach the end of charge status. But first of all I ...
1
vote
1answer
113 views
Should my NiMH battery powered circuit/device switch power sources when charging?
Details ---------------------------------------------------------------------------
Battery Supply: 2.4V (2x NiMH 1.2V - 1500mAh batteries )
Charging Supply: 5V (USB Power Adapter / Wall Wart)
...
0
votes
1answer
77 views
Can wet-cell and gel-cell batteries be mixed?
Given the same power ratings, can a (lead-acid/deep-cycle) gel-cell battery be paired together with a wet-cell battery in use?
For example, with a motorized/electric wheelchair, would one be able to ...
8
votes
1answer
224 views
Could I double the batteries for double the usage time?
If I were to double the exact same battery of a particular device (noted below), could/would that effectively ~double the device's usage time (more or less)?
For reference --
There's a motorized ...
4
votes
2answers
104 views
What is the meaning of a battery's “cycle life?”
I started to read about batteries, I am interested in lithium batteries, I found a description regarding the stability and capacity/weight, but I read some unclear descriptions like "cycle."
What ...
0
votes
1answer
95 views
Basic power management circuit
I am modifying a system that is powered by the ignition circuit on a vehicle. Currently there is a simple physical on/off power switch. However, I am introducing a touch-screen computer that must have ...
1
vote
1answer
140 views
N MOSFET Issue in Battery Charging Circuit
My project uses a USB connection to charge a LiPo battery. The LiPo has built-in circuit protection. Everything works fine when hooking the +5V line straight from the USB hub to the battery's positive ...
3
votes
1answer
110 views
Building a High Current Power Supply? (Odd Voltage)
I'm working on a project involving some custom LiFePO4 battery modules. They can take a very high current charge, and I'd like to take advantage of that. I have battery management and charge ...
3
votes
3answers
117 views
Is there an instrument that can measure the capacity of lead acid batteries
Background
I have an electrical scooter with 6 x 12Volt lead acid batteries (72 Volts total), which are now in such a condition that they can barely get me to my work and back. I got a bunch of used ...
2
votes
0answers
49 views
Isolation between cells for battery charging & testing
I want to charge Lipo battery packs and possibly other chemistries too. Six cell packs for starters. But hope to handle more and less. Perhaps a lot more cells. For electric vehicles, skateboards, ...
0
votes
3answers
85 views
Electromagnetic charging
I'm building a circuit that uses a really low voltage and current. I thought that instead of using a standard battery it would be nice if I could use a rechargeable battery and charge it with ...
0
votes
0answers
89 views
Lead-Acid Battery charger circuit
I designed this charger circuit and i really appreciate any hints or advices so i can modify it and choose right components values .
I'm charging a 6V 4AH Lead-Acid battery
Thank you all in advance. ...
0
votes
1answer
112 views
How to power the microcontroller in a BMS of a large battery pack
Yeah, it's a short and simple question but I couldn't find an answer on google.
Just imagine I got a lots of LiIons in series , about 400 Volt for use in an electric vehicle.
I use some ICs to ...
0
votes
1answer
66 views
Understanding LiPo battery gas gauge circuit
I want to build a 3-cell battery charger for LiPo batteries using gas-gauge-bq20z65-r1 and bq24753A battery charger IC. But I am having problem understanding how the bq20z65-r1 operates.
...
8
votes
2answers
237 views
Does TI's LiFePO4 CV-free fast charge method reduce cell lifetime?
TI claim that you can charge LiFePO4 cells by CC (constant current) charging as usual but to a higher than usual voltage (eg 3.7V rather than the usual 3.6V for LiFePO4) and then step transition to a ...
1
vote
1answer
295 views
Topology of solar PWM charger
I am looking into the design of the most simple (yet functional) PWM solar chargers for lead acid batteries. (Numerous examples can be found on Ebay for about 10 bucks.)
I have a hunch that they ...
3
votes
1answer
355 views
Arduino Runing On && Charging NiMH batteries
I have a project I'm working on that will have an Arduino running on 2 or 4 rechargeable NiMH AA batteries. I say 2 because I might boost up the voltage to what's needed. My problem is that this ...
1
vote
2answers
131 views
Solar cell trickle charging lead-acid without charge controller
Can somebody comment on sizing a solar cell for trickle charging a lead-acid battery bank without a charge controller for several months?
I found a non-authoritative source that claimed that cells ...
-1
votes
1answer
121 views
Charging 12V/4A battery
Can I charge a 12V/4Ah sealed rechargeable battery with a 13.5V/500mA charger? If so, how much time would I need to charge it to 100%? If not, how can I charge the battery?
2
votes
1answer
156 views
Charge LiPo battery with solar panel
I've a solar panel of 5.5 V and 100 mA. Could I use it to charge LiPo batteries using the MAX1555?
Of couse that the voltage will drop due to the the Schottky diode.
-4
votes
3answers
203 views
How many D cell batteries would you need to replace a 6V 4.5Ah battery? [closed]
How many D cell, 8000 mAh -1.5 V batteries would you need to replace a 6V 4.5Ah battery?
I'm trying to make a power comparison and not physically make the replacement. Would you suggest a different ...
1
vote
1answer
104 views
USB charging and powering circuit with MAX1555 and MAX1881
I'm new to (rechargeable) battery powered devices, but I found the following article about using the MAX1555 and MAX1881 for building a charging (via USB) and powering (µC-circuit, 3.3V, max. ~70mA) ...
0
votes
1answer
79 views
Battery charger for AA batteries
I am looking for a battery charger for AA batteries, without taking out the batteries from the board.
The board which is powered by AA batteries is : ...
6
votes
2answers
240 views
Limit the current being absorbed by a battery
I have a generator that supplies a constant DC 10A current to a NiMH battery pack with 240 cells in series (nominal voltage of DC 288V). This current is too high for any cell once it has reached 100% ...
1
vote
1answer
109 views
Can leaving rechargeable batteries in the unplugged charger for a few weeks cause batteries to lose their charge?
Is it okay to leave rechargeable batteries in charger even if it's not plugged in?
2
votes
1answer
76 views
Do I have to keep an AGM battery on float charge 24x7?
I have a 50 Ah AGM battery that I use rarely (lighting during power failures, off grid camping, etc) - I use it a few times/year.
To prolong the life of the battery, do I need to keep it on a float ...
0
votes
1answer
114 views
Can I monitor an ATMEGA406 using an Arduino Uno via SMBus?
I would like to build a small BMS using an atmega406 and then maybe use an Arduino Uno to show information about the cells on a computer or a small lcd
BMS = Battery Management System
Atmega406 ...
2
votes
0answers
87 views
Are “wider” battery packs less at risk for polarity reversal?
If make a 5V battery pack as a series of four 1.2V NiMH batteries, there is some risk of polarity reversal when the pack is discharged too much. I doubt this risk is reduced by plugging such packs in ...
4
votes
2answers
131 views
How can charge be determined?
How can software determine the amount of power or charge left in a battery (like an iPhone battery or a laptop battery)?
7
votes
3answers
329 views
NiMh or LiPo batteries for unattended charging/usage
I'm in the planning stage of a summer project: A WiFi controlled robot for remotely monitoring a shore home. The robot will consist of a 4-wheel platform (4 motors, 1 A stall current each, 7 V), ...
1
vote
1answer
68 views
Lithium Ion charging problems - power outages
Does any one know if general charge circuits for lithium ion batteries suffer from this problem:
-Flat Battery put on to charge.
-A power outage of long duration occurs (say 8 hours).
-When power ...
0
votes
0answers
160 views
Under what circumstance will damage a lab power supply?
I used a ISO-Tech IPS2303D DC Power Supply to test a solar power charging circuit based on BQ24650. There is a LRC circuit with 10uH inductor on it.
Long story short, I use the power supply to ...
