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Questions tagged [liion]

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0
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2answers
79 views

Charging 8 LiIon 18650 cells in parallel

I'm working on project that is Powered with 8 LiIon batteries/cells connected in parallel. Everything Works fine until batteries run out of "juice". For charging module I decided to use TP4056(@ 1A). ...
0
votes
1answer
56 views

Using a battery as a voltage source in a DC DC converter to supply a second battery?

I was wondering if I could use a battery as Vin to a DC DC converter to charge another battery. Example: Using a Li Ion battery pack and having it go through the DC to DC converter to charge a LiPo ...
-1
votes
1answer
29 views

Li-ion Modded Powerbank Question

So I got this single Li-ion power bank. It's a 18650, and I wanted to add another 18650 in parallel. I want to use the same circuit which produces a constant 5v. Is it safe to do it that way? in ...
0
votes
0answers
207 views

Help designing a satellite MPPT board [SPV1040] [duplicate]

I'm in the process of developing a pocketqube and I am currently working on the power system. I am hoping to use an SPV1040 MPPT IC to simplify the design and maximize efficiency. Each side of the ...
0
votes
1answer
124 views

18650 cells - Unable to measure capacity

I got many 18650 batteries from notebook batteries and I want to test their capacity by my Turnigy Accucell 8. My problem is, that when I start discharge program (0.5A what is from battery datasheet) ...
0
votes
1answer
66 views

Li Ion battery issue (voltage appears and disappears)

I built up a Rspberry Pi self-driving car and everything was fine while I collected data for the Neural Net. After NN finished its training, I want to test the system. At the beginning, everything was ...
-1
votes
1answer
79 views

Connecting diffrent lipo in series to achive high voltage

Im not so familier with lipo and liion but know there dangers For my recent project i got an audio amplifier with works good on voltage of 14-18v so i need this range of voltage My amplifier is ...
0
votes
1answer
2k views

LiIon tp4056 with protection, avoid drop out voltage at output

I have checked some behaviour in TP4056 boards (with protection circuit) that i don't like at all. (see schemas at the end) When you use the TP4056 module with the protección board, you will get a ...
2
votes
1answer
593 views

Li-Ion battery charging, termination current (ITERM)

How much does termination current (ITERM) affect the level of capacity in a Li-Ion battery? I mean, in a given capacity (say battery 3.7V 1000mAh) how much charged would a battery be when the ITERM ...
0
votes
1answer
134 views

Low temperature charging batteries

I was wondering what are the best rechargeable battery solutions for working in low temperature environments, ie. from -20 to -10 Celsius degrees. From what I have figured out, Li-ion batteries cannot ...
1
vote
2answers
50 views

Protection from fully charged battery

I want to connect a Li-Ion battery on a GSM/GPRS module expecially this one (http://www.electrodragon.com/w/GSM_GPRS_A6_Module). In general parameters is mentioned operating voltage from 3.3V to 4.2V ...
0
votes
1answer
43 views

High current pulses for GSM supply

I'm looking for a switching buck/boost regulator that works from a Li-Ion battery (e.g. rechargable 18650) with high efficiency and capable of providing high current pulses for GSM application. While ...