APC Backup 1000 battery replacements (12V Lead Acid)

[mr cheese]

Looking for some answers regarding a new battery for an APC UPS, but unsure what sub-forum to post in. Anyone know? 

 

I've got an APC Backup 1000 and pulled the battery out of it as they died to age. I don't remember what specifically was in there but I do know it was literally 2 12V Lead Acid batteries taped together by a label with some power cables joining the two (I kept these, and the piece of plastic between them. Anyways, it's time to get it back up and running now that my home network is nearing completion and payday is coming around, wanted to get some ideas for good 12V battery replacements. I've heard people throw around the idea of LiFePo but I don't know anything about that or if they would work better. 

 

The batteries were in your "standard" 12V 7Ah form factor (see below for an example) but I know on Amazon some definitely-not-shady sellers offer higher capacity batteries at competitive prices I'd be willing to go in on to keep the power on for a bit longer. I don't have an idea of budget, just trying to go for longevity while the power's out to see if I can make the most of the UPS I already have (got it for free)

 

Spoiler

 

Link:

https://www.homedepot.com/p/MIGHTY-MAX-BATTERY-12-Volt-7-Ah-Sealed-Lead-Acid-SLA-Rechargeable-Battery-ML7-12/307979135#overlay

 

[Skiiwee29]

Power Supplies

 

I have moved this thread to it so you can ask away.

[mr cheese]

Just now, Skiiwee29 said:

Power Supplies

 

I have moved this thread to it so you can ask away.

Thanks so much! Figured it would be here but wasn't sure 

I'll edit the question

[OhYou_]

lifepo4 is great but can sometimes be incompatible. You need to ensure the battery was made properly with balance circuitry and a upper voltage cutoff ideally. 
UPSs are kind of low tech when it comes to charging, and could potentially just die when faced with the far lower internal resistance of a discharged lifepo4 pack. They could also potentially fail in a terrible way that effectively breaks the voltage reg and will overcharge the cells. 
The safest answer is to just continue using lead acid, but I put lifepo4 in a ups and it's been going without issue for 3 years so far. outlasting lead acid already.

tl;dr if you use lifepo4 packs then do a couple of charge discharge cycles before you set it free in your house unmonitored and use quality packs or test for overvoltage protection
 

[mr cheese]

16 minutes ago, OhYou_ said:

tl;dr if you use lifepo4 packs then do a couple of charge discharge cycles before you set it free in your house unmonitored and use quality packs or test for overvoltage protection

Noted, didn't know SLA batteries were so short-lived! I'll probably try out LiFePo just bc I don't intend to really upgrade this UPS any time soon, any good picks for chargers and/or battery brands if you know any? Also, do you recon if I can get a higher Ah capacity battery in the same form-factor as the 12v 7Ah if it'll make the UPS shit itself (if this kind of mystical battery does exist, i seem to remember it in my head but have no idea)

[OhYou_]

the brand I used in mine were expertpower brand. I tore one down for a different project and they do contain a proper bms. I didnt test it for overvoltage prot though. 

they will always be a bit more capacity than the lead acid equivalent size because they have better energy density. it wont hurt anything. just alway rember that lifepo4 has a voltage cap of 3.65v but more ideally 3.5v as the last bit is like 1-2% of capacity. so your UPS float voltage should be 14v ideal, 14.6 maximum. 
You absolutely should measure this after it is charged and after 24 hours, it is pretty important or the batteries will not last very long.