Electronics > Beginners
9V LiPO charging circuit
alex-sh:
Hello,
I have Soshine 9V 650mA LiPO battery, which I want to use in my circuit.
I use an external power supply DC 12-25V to be able to power the project/charge the battery.
The project has got IC 7805 (input min 7V, max 25V) on input, therefore I can power the project directly from 9V battery. Project consumption is below 60mA. I have had experience with 3.7V / 7.4V LiPOs, but have no idea how to charge this 9V battery. There is an AC charger which comes with the battery.
Could anyone please help me re designing a charging circuit?
Many thanks
Alex
Peabody:
There are a few Youtube videos on this product. It appears to be two LIPO cells in series, so really a nominal 7.4V battery, not 9V. But that means it may be possible to charge them as you would any 2S LIPO battery. But unless there is further circuitry inside the battery, you can't access the individual cells for charging, which could lead to unbalance problems. I think the RC guys know all about how to charge a 2S setup, but I never made it beyond 1S. Hope you find an expert here.
Audioguru:
The Soshine "9V" battery is 7 years old. There are newer 7.4V or 8.4V when fully charged Li-PO batteries available today.
Nobody cares about balance-charging them, simply let it blow up then replace it.
I charge ALL my 2-cells Li-PO batteries with a balanced 2-cells Li-PO charger. My "9V" Ni-MH batteries (6 or 7 cells?) do not last long.
alex-sh:
--- Quote from: Peabody on February 13, 2019, 05:57:59 pm ---There are a few Youtube videos on this product. It appears to be two LIPO cells in series, so really a nominal 7.4V battery, not 9V. But that means it may be possible to charge them as you would any 2S LIPO battery. But unless there is further circuitry inside the battery, you can't access the individual cells for charging, which could lead to unbalance problems. I think the RC guys know all about how to charge a 2S setup, but I never made it beyond 1S. Hope you find an expert here.
--- End quote ---
Yeah, but non of these videos is about circuitry. At least I could not find one.
Unfortunately, it is not 7.4V battery. It is more. I’ll measure voltage shortly
alex-sh:
--- Quote from: Audioguru on February 13, 2019, 07:36:08 pm ---The Soshine "9V" battery is 7 years old. There are newer 7.4V or 8.4V when fully charged Li-PO batteries available today.
Nobody cares about balance-charging them, simply let it blow up then replace it.
I charge ALL my 2-cells Li-PO batteries with a balanced 2-cells Li-PO charger. My "9V" Ni-MH batteries (6 or 7 cells?) do not last long.
--- End quote ---
You are correct. It is 8.2V. I fully charged it a month ago.
Guys, I do not care about balance charging. I just need to charge the battery and have my project run on either (1) battery. Minimum voltage is 7V for 7805. (2) DC power 12-24V
If I do not find how to utilise this battery, i’ll just use a single 3.7V battery with a 9V boost converter. There are many options for a 1S
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