This seems to be a more difficult task than I could have imagined.

What do you consider when choosing a backup battery for your inverter or solar system?

1/ The type of cells used?

2/ The type of BMS used?

3/ Temperature monitoring?

3/ How the battery temperature is managed during charge and discharge cycles?

4/ Compatibility with the inverter you choose.

5/ Charge and discharge rate, this seems to be trick question, normal, max or advisable

6/ Life cycles? how many time it can be charged and discharged

7/ Designed life expectancy, 10 or 20 years?

8/ Firmware and software compatibility with inverters?

9/ Type of BMS of communication?

10/ parallel connections, how many etc?

Those days of talking about a the thickness of the lead cells or the battery case base and battery amperage only is a thing of the past.

Batteries have become complex little power houses.

what I thought would be a simple question, who makes the best bang for your buck with all the frills.

Which battery is the best and why? Can anyone supply credible data comparing lithium batteries with lithium batteries.

I bought a blue nova battery and cut it up to see what it looks like inside. It was assembled better than I expected.

Maybe I should buy each battery sold in SA and strip it, check things like the QR on the cells to verify the information on the data sheet, do capacity checks and show everyone how they are built.