Poe battery device

[Pocster]

Anyone tried anything like this ?

All battery stuff is pants .

This in theory sounds good ……

 

 

[Pocster]

Though the liquified gas cooker use may be interesting 🤣

[NailBiter]

D cells? What year is it?! Doesn't everything battery powered run on either coin cells, 18650s, CR123As, AAs or AAAs these days?

IMO you either want to charge the batteries whilst they are still in the device, e.g. a torch / lantern with USB C on it or you want to be able to cram a fair few batteries in a large battery charger. For example we have a fast 4 port charger that can do 18650s and CR123As and one of those Ikea AA / AAA charger boxes.

These are mounted to a tiled wall in a tiled room (in case they decide they want to set fire).

This means we don't have cable mess like the above and we can keep a supply of charged batteries in a FIFO queue. 

[Pocster]

5 hours ago, NailBiter said:

D cells? What year is it?! Doesn't everything battery powered run on either coin cells, 18650s, CR123As, AAs or AAAs these days?

IMO you either want to charge the batteries whilst they are still in the device, e.g. a torch / lantern with USB C on it or you want to be able to cram a fair few batteries in a large battery charger. For example we have a fast 4 port charger that can do 18650s and CR123As and one of those Ikea AA / AAA charger boxes.

These are mounted to a tiled wall in a tiled room (in case they decide they want to set fire).

This means we don't have cable mess like the above and we can keep a supply of charged batteries in a FIFO queue. 

D cells was just the screenshot I took - they do all cell sizes . Most zigbee stuff is cr2 . This effectively in theory is charging the battery whilst in the device . So stick a poe usb connector to this and hopefully have a device that never needs the battery changed . Z wave stuff seems to have far more usb chargeable devices than zigbee . Forget all the 5 yr / 2yr battery life on a sensor - it’s pants .

[Pocster]

5 hours ago, NailBiter said:

This means we don't have cable mess like the above and we can keep a supply of charged batteries in a FIFO queue. 

So I’m on about installing these in a device and having them usb charging …

[Pocster]

Failing that I suppose I could 3d print a cr2 battery stick a wire on either end and then supply 3v off the poe …

[RobLe]

I’ve had a pp3 type of these usb lithium cells in a smoke detector. Thought it was great at first, then found it has high self discharge (not normally an issue with lithium), and lower energy store.  Upshot was it only lasted a couple of months in a smoke detector, while a non usb rechargeable lithium lasts years before it squarks.  Don’t flatten them tho, no bms inside cheapie pp3 lithium.