Overview

Model: Back-UPS ES 750

Battery Details

I ordered this LiFePO4 battery off amazon which is the exact same size as the original.

Cost: $63 CA plus Taxes.

NASTIMA 12V 8Ah Rechargeable Lithium Iron Phosphate Battery,Built-in BMS, 4000+ Cycles LiFePO4 Battery Pack

Tested this battery's capacity pulling 2A. Capacity came up as 8.8Ah.

Note: Battery voltage stays at 0v once discharged until voltage is applied. Does not bounce back on it's own.

I performed a capacity test on the old lead acid battery. The battery had a 3 Ah capacity when drained to 10.5v at 2A.

I ended up having some quick shutdowns after replacing the battery.

On this UPS I have the following items connected:

Item	Power Consumption
QNAP TS251 Network Attached Storage	~100W (spec: 18.09 W)
HP Compaq Elite 8300 SFF	~200W
Dell PowerEdge T150	~300W
Raspberry Pi 1	~5-10W
Asus RT-AC56U Router	~10W
Smart/RG DSL Modem	~10W
Asus Hub	~10W
Total Power	640W (~ 5A@120V)
Battery Amperage	50A@12V

Ok, so battery has a 10A max output, which is 1A at 120V.

Lets figure out what are real power usage is....

Item	Power Consumption
QNAP TS251 Network Attached Storage
HP Compaq Elite 8300 SFF
Dell PowerEdge T150
Raspberry Pi 1
Asus RT-AC56U Router
Smart/RG DSL Modem
Asus Hub
Total Power

Reference	URL
Manual	SCON-89HM8Q_R4_EN.pdf
Specifications	DFAH-8GLQ3H_R0_EN.pdf
DIY Replacement Battery 12V 18650 Li-ion For APC Back-UPS 650	https://www.yousun.org/archives/101
Replace battery	https://www.youtube.com/watch?v=_dydlRHFjrc
Details	https://www.yousun.org/archives/660