Lighting deal with 10% claimed.
Have one ROMOSS power bank which runs pretty strong and looking for another big boy with USB-C.
Just found it on Amazon lighting deal, price not bad for this version. Regular price $34.99.
CamelCamelCamel.
As these use Lithium Polymer cells (Li-Po) it's best not to keep them fully charged, or completely discharged, for long periods. It's best to charge right before you think you'll need it, like the day before taking a trip etc, and even then it's best not to charge to 100% if you can make do without the full capacity. So until needed only charge to around 40-50%. Doing this will maximise cell life.
What type should I look for if I don't want to worry about overcharging?
One that takes Li-Ion 18650 cells, but they'll probably be bigger physically for the same mAh rating and I'm not even sure if any manufacturers still make them, but I haven't looked. You can buy just the case and add the 18650 cells of your choice but for a good case and decent cells it'll probably cost considerably more. It's cheaper for the manufacturers to use Li-Po for the higher power density and smaller overall size vs ones with decent 18650s.
I don't think it's a matter of overcharging per-se as they have safeguards for that but the Li-Po cells are more stressed the closer they are to full charge and especially when left like that for weeks or more. That will reduce their capacity over time as well as reduce their overall useful life which is why you shouldn't leave them at a high charge for an extended time, unless you're not concerned about them failing prematurely. If you're using it daily to recharge or power devices then it's not so critical as they're not being left at a constant high charge, just like the ones in your phone, however it still helps prolong the cell life to not fully charge any Li-Po if you don't need the full runtime out of it. For this very reason you can get apps for phones that can remind you to stop charging when it reaches a user preset charge level and the same for discharging too.
I'm no expert so best to do your own research.
Thanks heaps for your reply, very informative. I spose I’ll just look for a regular Li-Po one. :D
Didn't Ozb community work out recently that Romoss lie about capacity?
Well as it turns out they're not really lying. There's confusion about how much you can realistically get from a power bank as compared to what the battery in it is rated at. The main issue is that the batteries are 4.2v when fully charged and that drops to maybe 3.4v as it discharges, but the power bank has to convert that to a minimum of 5v and up to 12v for fast charging. It seems that the higher the output voltage the less efficient the power banks are so there's less usable capacity, but it's probably every power bank manufacturer that rates their power banks by the battery capacity, not just Romoss. It's probably more accurate to test their capacity when recharging them from 0% than to measure how much power they can supply.
Again, I'm no expert so just my 2c worth.
Yeah I was thinking about the deal you commented on:
https://www.ozbargain.com.au/node/628497
I think the capacity thing is legit, but there seems to be a lot of people in that tread saying their unit was faulty in some way.
Yes there are are few of those but there's always going to be some percentage that go faulty of any product. Mine has been working well so far but time will tell. I think they're pretty good value and worth a go if you can get one when they're on sale.
![[Prime] ROMOSS 20000mAh Portable Charger with LED Display, Sense 6PS+ Power Bank $26.76 Delivered @ Romoss Amazon AU](https://files.ozbargain.com.au/n/52/633052.jpg?h=66e337cc)
big fan of being able to see the volts/amps a device is charging at as well as a more granular capacity display for the powerbank itself.