I always recommend getting a standard desktop UPS, such as APC’s 850VA BE850M2 on Amazon http://amzn.to/2Ul2ji6 or APC’s 1500VA BX1500M also on Amazon http://amzn.to/2DyMAIs, to protect your hard drive for dips in power (brownouts and blackouts).

At some point your UPS’s battery is going to fail. It’s common to want to replace the entire UPS unit, but you can save a considerable amount of money by simply replacing the battery.

Most manufacturers, like APC, offer a battery replacement lookup tool such as this: https://www.apc.com/shop/us/en/tools/replacement-battery-selector.

Here’s a running list of battery cartridges I encounter with inexpensive replacements with Prime shipping on Amazon:

APC RBC109 – BR1500LCD, BX1500LCD, BR1200G, BR1300LCD, BX1300LCD, BN1250LCD

http://amzn.to/2PCIAc4

APC RBC17 – BE650G1, BE750G, BR700G, BE850M2, BX850M, BE650G, BN600, BN650M1, BN700MC, BN900M

http://amzn.to/2Ioeqso

APC RBC124 – BR1500G, BR1300G, BX1500M, BX1500G, SMC1000-2U, SMC1000-2UC, BR1500GI, SMC1000-2U, SMC1000-2UC

http://amzn.to/2DbPKkm

APC RBC7 – SMT1500, SMT1500C, SMT1500US, SUA1500, SUA1500US

http://amzn.to/2Il4Lzc

APC RBC33 – BT1500, BT1500BP, BR1500, BX1500, SC1000, SN1000

http://amzn.to/2IFlBIQ

UPC RBC12 –

http://amzn.to/2PtTrbw (Note this is not APC branded)

UPC RBC24 –
http://amzn.to/2N3gVhD (Note this is not APC branded)

Amazon is a great solution for ordering if you have access to a Prime account because these parts tend to be heavy and expensive to ship.