All Questions
Tagged with diy battery-charging
17 questions
-2
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1
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154
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How to build DIY home energy backup system (UPS) [closed]
I have a home in a countryside where grid power cuts off very often (3-5 times per week) for a few hours, especially in a winter time.
I came up an idea to make a backup system that will automatically ...
1
vote
1
answer
104
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How to Test Battery Health in GRUNDIG VCP 3930 with a Multimeter, Arduino, or Raspberry Pi?
As a follow-up to this question, I own a GRUNDIG VCP 3930 vacuum cleaner (which uses a 25.2V, 2000mAh Li-ion battery) that has stopped charging properly. I am being told that the battery on this ...
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1
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0
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131
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Use 2s LiPo Battery as Battery Cell for Microcontroller
Is there a convenient way to use a large 2s LiPo battery (such as this one) as a power source for a microcontroller and LED strip? Specifically I'm looking for the ability to seamlessly switch between ...
- 111
1
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1
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177
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How do I calculate the type and size of battery to use for this solar-powered USB charger?
I've been out of the electrical mathematics for a while and want to see what battery I need to do this.
5 V USB output, 5 V DC solar power panel (I do have two I could use together, assuming the ...
3
votes
2
answers
2k
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How to safely use Lithium-ion batteries in DIY projects?
Disclaimer: I am far from being an electrical engineer, I'm only a DIY enthusiast trying to stay safe.
I'm building a collection of sensors using little ESP-01 chips, but having them running free on ...
- 323
0
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0
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95
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12V Alternator charger using MOSFET with 3 x 12V output charging serial connected batteries ( 3 x 12V)
I am planning of building charger for trolling motor that will charge from single alternator 12VDC three serial connected batteries with three individual 12V outputs. This is something that is ...
- 1
0
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2
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100
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I'd like to know if my own version of a cell balancer will do the job
I have two 3.7v cells in series to make a 7.4v battery. I want to make my own active balancer because I don't have access to buying any cell balancers.
I'm using a transformer with 2n turns on the ...
0
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1
answer
100
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Help troubleshooting diy battery charge/protect/step-up circuit
I am following the schematic below trying to put together the circuit for a battery charger with over/under voltage protection and 3.7 to 5v step up.
I have populated only the battery charger part of ...
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0
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0
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73
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BMS battery build DIY help
I am making a battery charger for a speaker using 4 18650 3.7V batteries.
Now I know that I would need to get a 4S Lipo or Li-ion PCB, the only thing I don't understand is the current rating that I ...
- 211
0
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1
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12k
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series charging three 18650 batteries with three chargers off the same 5V supply [duplicate]
being from a CS background I am a complete noob at this. I'll keep this short. I have a couple of 18650 batteries that i salvaged from an old laptop battery. I want to make a balanced 3S charger with ...
7
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1
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45k
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Diy 18650 4s battery pack [How to charge, how to build?]
I'm building a bluetooth portable speaker.
However, I have some questions about building my first 18650 battery pack.
I have 4 pcs of Panasonic unprotected NCR18650B 18650 3.7V 3400mAh.
My goal is to ...
- 71
-1
votes
1
answer
2k
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DIY 4*18650 Batteries charger with TP4056 paralel problem with how to balance it
days ago I did this project like the pic which is a DIY for 4*18650 OR 6*18650 (NOW I MADE 4 AND LET`S STICK TO IT) Sony vtc5a charger 3.7 v with new tp4056 with protection (copied from one youtube ...
- 101
1
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1
answer
5k
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Can I charge a 12V 2A NiCd battery with 18V 14.6A?
I have a 12V 2A NiCd battery which I want to charge. I have a power unit that puts out 18V 14.6A. Can I use it to charge it? Would the battery just draw the current it needs or would it always put ...
- 51
0
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1
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573
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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 ...
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0
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1
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107
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Simple and easy-to-charge battery for a DIY power generation project with varying voltages and currents?
I'm converting a decorative windmill to a power generation device. I'm looking for a battery that can charge with wildly different voltages and currents and be simple and easy to charge. It doesn't ...
- 101
0
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1
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573
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Inductive Charging Mouse [closed]
I recently bought a wireless gaming mouse and while functionally its great, the battery life is a little less than I would like.
I tried to mitigate this by adding in another rechargable AA battery (...
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0
votes
1
answer
576
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Need help to backup cellphone - I need output power 5V 1A from AA batteries
How do I get 5V 1A for my backup battery for my cellphone from four AA batteries? (Each battery is 1.5V 2500mAh.)
Is it better to use a 7805 to regulate from 6V to 5V 1A to power my cellphone? Here's ...
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