Router Battery Backup

kolaval said:
Second issue.
No stock
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Shop around. Everybody and his dog sells these at the moment. I'm sure most places will be out of stock but there must be a few floating around. I've even seen saw Ecoflows and other inverter/battery/charger setups at Makro.
 
airborne said:
I’d open it up and see if it’s using 18650 cells, if so try balance charge them(charge each cell individually) and see if it helps, one cell is probably out of balance, has higher internal resistance or just a dud.
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Sorry for hijacking the comment, but I've been wanting to ask something about these 18650 cells. I have a Gizzu UPS for the router and ONT, and easily used to get through a 4 hour loadshedding session with both devices connected to the Gizzu. However now, it dies after 3h, so it can't get through the 4h stages.

I know the cells in the Gizzu is 2200mAH as advertised, and I see there are 18650 cells available with 3500mAH capacity. Would it be possible to simply get 4 3500mAH cells, solder them in the same way and use the same bms found in the Gizzu? My understanding is that a bms works on voltage and not capacity, so it should work and charge them to 100%?
 
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VicB said:
Sorry for hijacking the comment, but I've been wanting to ask something about these 18650 cells. I have a Gizzu UPS for the router and ONT, and easily used to get through a 4 hour loadshedding session with both devices connected to the Gizzu. However now, it dies after 3h, so it can't get through the 4h stages.

I know the cells in the Gizzu is 2200mAH as advertised, and I see there are 18650 cells available with 3500mAH capacity. Would it be possible to simply get 4 3500mAH cells, solder them in the same way and use the same found in the Gizzu? My understanding is that a bms works on voltage and not capacity, so it should work and charge them to 100%?
Click to expand...

Should be fine, as long as the voltage curves of the replacement batteries are in line with the ones being replaced. I would've done the same if it was not for the sparks I saw when Linus did it on his channel...
 
VicB said:
Sorry for hijacking the comment, but I've been wanting to ask something about these 18650 cells. I have a Gizzu UPS for the router and ONT, and easily used to get through a 4 hour loadshedding session with both devices connected to the Gizzu. However now, it dies after 3h, so it can't get through the 4h stages.

I know the cells in the Gizzu is 2200mAH as advertised, and I see there are 18650 cells available with 3500mAH capacity. Would it be possible to simply get 4 3500mAH cells, solder them in the same way and use the same found in the Gizzu? My understanding is that a bms works on voltage and not capacity, so it should work and charge them to 100%?
Click to expand...
Yes it will be fine, just take slightly longer to charge as there is more capacity. Just make sure you replace with the same voltage cells.
 
ld13 said:
Should be fine, as long as the voltage curves of the replacement batteries are in line with the ones being replaced. I would've done the same if it was not for the sparks I saw when Linus did it on his channel...
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Yeah, ideally you need a spot welder to do this. Soldering isn't the right way and can damage the cells. Maybe a better option is to get an external housing for the batteries?
 
surface said:
I bought 2 of these units in August 2021 (one for ONT & other for router) and it worked great for almost a year. Both lasted for 4-5 hours as mentioned on the site.

Now, one of them lasts just about 2 hours. Other one is still ok to ride over 4.5 hours a time.
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I am disappointed in geewiz. I bought this unit (a bit different than earlier one) and this just lasted 2 hours. Brand new unit. I am going to file a returns request.

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wingnut771 said:
Yeah, ideally you need a spot welder to do this. Soldering isn't the right way and can damage the cells. Maybe a better option is to get an external housing for the batteries?
Click to expand...

I’ve soldered many of them with no issues years later, just make sure you prep them right(I used a dremel to lightly grind the ends and the solder then takes instantly)to minimise the solder time and heat transfer.
 
surface said:
I am disappointed in geewiz. I bought this unit (a bit different than earlier one) and this just lasted 2 hours. Brand new unit. I am going to file a returns request.

Mini UPS

Buy Mini UPS online at the Best Prices! Door to Door and Overnight Delivery. Voted the best online store in SA. View Here
www.geewiz.co.za www.geewiz.co.za
Click to expand...

Their rating at 57Wh must be wrong.
 
xrapidx said:
I wonder if this would run my daughters fish tank - the light and pump are already 12v - %#$%#$ load shedding is wrecking havoc on the water quality - and then it keeps killing the pump because the pressure keeps pushing water back into the pump, even with two one way valves.
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Well that didn't work :(

Why would a 12v 1a pump not work off one of these? Its completely dead. Checked with a mulimeter and it picks up voltage. (pump also works of transformer)
 
xrapidx said:
Well that didn't work :(

Why would a 12v 1a pump not work off one of these? Its completely dead. Checked with a mulimeter and it picks up voltage. (pump also works of transformer)
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Maybe not enough power? What happens with a 12v battery?
 
How about this option for cheap cheap - just for a monitor, ONT & router for 4 hours ? I suppose I need to buy battery with this.

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surface said:
How about this option for cheap cheap - just for a monitor, ONT & router for 4 hours ? I suppose I need to buy battery with this.

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Click to expand...
Yes you would need a deep cycle or lithium battery. The first one is better as it's a ups so you can leave stuff plugged in permanently vs the second one is just an inverter with no charger so you would still need a charger and change plugs when the power goes out.
 
elf_lord_ZC5 said:
Something with more AMPS ... ?
Click to expand...

wingnut771 said:
Yeah, like an alarm or gate motor battery. You may want to go bigger depending on runtime.
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Tried an alarm battery - nothing - also tried connecting the tank LED light (it's a small round led light) - also nothing.

Weird.

EDIT: Can't really find much on the pump - there's nothing on the transformer or pump - but - looking on in the Q&A section on Amazon - looks like its AC.

Wonder whether a 12 DC to 12 AC converter will solve the issue.
 
xrapidx said:
Tried an alarm battery - nothing - also tried connecting the tank LED light (it's a small round led light) - also nothing.

Weird.

EDIT: Can't really find much on the pump - there's nothing on the transformer or pump - but - looking on in the Q&A section on Amazon - looks like its AC.

Wonder whether a 12 DC to 12 AC converter will solve the issue.
Click to expand...
Never heard of an 12V AC pump. So, the transformer is stepping down 220V to 12V. The converter you speak of is a normal inverter which would convert 12V to 220V then you use the supplied transformer with the pump as normal. Not aware of 12V DC to 12V AC inverters, that's beyond my knowledge.

I would look for a pure sine wave inverter UPS and deep cycle or lithium battery. R10k easy but then you can watch tv too. Or maybe get a 12V DC pump and charger for battery?
 
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