Electronics > Beginners

Notify when batteries getting too low

<< < (5/6) > >>

Audioguru:
My 2-cells Li-PO batteries have 3 wires so that they can be balance-charged and so the voltage tester can show the voltage of each cell and their total.

fixit7:
My 18650s are a different type as yours, right?

Safety
Main article: Lithium-ion battery § Safety
Apple iPhone 3GS's Lithium-ion battery, which has expanded due to a short circuit failure.

LiPo cells are affected by the same problems as other lithium-ion cells. This means that overcharge, over-discharge, over-temperature, short circuit, crush and nail penetration may all result in a catastrophic failure, including the pouch rupturing, the electrolyte leaking, and fire.[18]

All Li-ion cells expand at high levels of state of charge (SOC) or over-charge, due to slight vaporisation of the electrolyte. This may result in delamination, and thus bad contact of the internal layers of the cell, which in turn brings diminished reliability and overall cycle life of the cell.[7] This is very noticeable for LiPos, which can visibly inflate due to lack of a hard case to contain their expansion.

For a comparison with LFP cells on this subject, please see LiFe cell safety

Weren't those banned on planes at one time? A little research.

Q2. What kinds of batteries does the FAA allow in checked baggage (including gate-checked bags)?
A2 . Except for spare (uninstalled) lithium metal and lithium-ion batteries, all the batteries allowed in carry-on baggage are also
allowed in checked baggage. The batteries must be protected from damage and short circuit or installed in a device. Battery-powered
devices—particularly those with moving parts or those that could heat up—must be protected from accidental activation. Spare
lithium metal and lithium ion/polymer batteries are prohibited in checked baggage—this includes external battery packs. Electronic
cigarettes and vaporizers are also prohibited in checked baggage. “Checked baggage” includes bags checked at the gate or planeside.

sleemanj:
For all intents and purposes "LiPo" and "Lithium-Ion" are the same thing, an 18650 can be thought of as equivalent to a LiPo which was rolled up and stuck inside a metal can, or conversely a "LiPo" can be thought of as an 18650 which was unrolled and put in a soft pouch.

This is a simplification, but not much of one, from the user perspective, charging, discharging, protection, balancing, and electrical safety are the same if you are using a hard shell (18650...) or a soft shell (LiPo...) Lithium-Ion cell architecture.

LiFePO4 is different and must not be confused with Lithium-Ion, they have different characteristics.




fixit7:

--- Quote from: sleemanj on June 16, 2019, 05:53:41 am ---For all intents and purposes "LiPo" and "Lithium-Ion" are the same thing, an 18650 can be thought of as equivalent to a LiPo which was rolled up and stuck inside a metal can, or conversely a "LiPo" can be thought of as an 18650 which was unrolled and put in a soft pouch.

This is a simplification, but not much of one, from the user perspective, charging, discharging, protection, balancing, and electrical safety are the same if you are using a hard shell (18650...) or a soft shell (LiPo...) Lithium-Ion cell architecture.

LiFePO4 is different and must not be confused with Lithium-Ion, they have different characteristics.

--- End quote ---

It comes down to what the user personal choice is.

LiPo Batteries
Pros

    Much lighter weight, and can be made in almost any size or shape.

    Much higher capacities, allowing them to hold much more power.

    Much higher discharge rates, meaning they pack more punch.

Cons

    Much shorter lifespan; LiPos average only 150–250 cycles.

    The sensitive chemistry can lead to fire if the battery gets punctured.

    Need special care for charging, discharging, and storage.

Audioguru:

--- Quote from: fixit7 on June 16, 2019, 01:23:57 pm ---
Cons

    Much shorter lifespan; LiPos average only 150–250 cycles.

    The sensitive chemistry can lead to fire if the battery gets punctured.

    Need special care for charging, discharging, and storage.

--- End quote ---
No. Name-Brand Li-POs last for 500 cycles or more, the same as Lithium-Ion. Cheap Chinese ones last for 20 cycles or less.
They have the same chemistry as Lithium-Ion so they need the same special care.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod