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Removed "lithium" tag, as that only applies to primary (non-rechargeable) batteries. While I'm here, light copy edit e.g. for spaces between values and units in voltages etc. per standard practice, to help readability.
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SamGibson
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Can I keep Li-Ion battery 'charging' continuously at 3.7V7 V?

I have built a Raspberry Pi NAS and it is powered by a lithium ion-ion battery through a 5V5 V step up-up module - the one used in Powerbankspowerbanks. The battery is a 18650 Li Ion-Ion battery which is kept continuously at 3.7V7 V by an adjusted LM2596 module.

I am not directly powering the Pi through a 5v5 V mobile charger because of two reasons - brownouts and blackouts will cause the NAS to reboot. Second, no cheapishcheap-ish mobile charger's output is free from AC ripples and Y cap-cap leakages, which might shorten the life of the Pi. And it'll be overkill to buy a well constructed-constructed Apple charger that's fairly foolproof.

Now, I was wondering, is it harmful for the lithium ion-ion battery to be kept at 3.7 V? Does it cause continuous trickle charging, that is harmful for Lithiumlithium-ion batteries? Or does the battery take zero current once it's at 3.7V7 V?

The circuit is like this: enter image description here

circuit diagram!

Can I keep Li-Ion battery 'charging' continuously at 3.7V?

I have built a Raspberry Pi NAS and it is powered by a lithium ion battery through a 5V step up module - the one used in Powerbanks. The battery is a 18650 Li Ion battery which is kept continuously at 3.7V by an adjusted LM2596 module.

I am not directly powering the Pi through a 5v mobile charger because of two reasons - brownouts and blackouts will cause the NAS to reboot. Second, no cheapish mobile charger's output is free from AC ripples and Y cap leakages, which might shorten the life of the Pi. And it'll be overkill to buy a well constructed Apple charger that's fairly foolproof.

Now, I was wondering, is it harmful for the lithium ion battery to be kept at 3.7? Does it cause continuous trickle charging that is harmful for Lithium batteries? Or does the battery take zero current once it's at 3.7V?

The circuit is like this: enter image description here!

Can I keep Li-Ion battery 'charging' continuously at 3.7 V?

I have built a Raspberry Pi NAS and it is powered by a lithium-ion battery through a 5 V step-up module - the one used in powerbanks. The battery is a 18650 Li-Ion battery which is kept continuously at 3.7 V by an adjusted LM2596 module.

I am not directly powering the Pi through a 5 V mobile charger because of two reasons - brownouts and blackouts will cause the NAS to reboot. Second, no cheap-ish mobile charger's output is free from AC ripples and Y-cap leakages, which might shorten the life of the Pi. And it'll be overkill to buy a well-constructed Apple charger that's fairly foolproof.

Now, I was wondering, is it harmful for the lithium-ion battery to be kept at 3.7 V? Does it cause continuous trickle charging, that is harmful for lithium-ion batteries? Or does the battery take zero current once it's at 3.7 V?

The circuit is like this:

circuit diagram!

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Bagho
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Can I keep Li-Ion battery 'charging' continuously at 3.7V?

I have built a Raspberry Pi NAS and it is powered by a lithium ion battery through a 5V step up module - the one used in Powerbanks. The battery is a 18650 Li Ion battery which is kept continuously at 3.7V by an adjusted LM2596 module.

I am not directly powering the Pi through a 5v mobile charger because of two reasons - brownouts and blackouts will cause the NAS to reboot. Second, no cheapish mobile charger's output is free from AC ripples and Y cap leakages, which might shorten the life of the Pi. And it'll be overkill to buy a well constructed Apple charger that's fairly foolproof.

Now, I was wondering, is it harmful for the lithium ion battery to be kept at 3.7? Does it cause continuous trickle charging that is harmful for Lithium batteries? Or does the battery take zero current once it's at 3.7V?

The circuit is like this: enter image description here!