Question 1

Does this have a battery management system (BMS) built in?

Accepted Answer

I found the data sheet on this battery. It does have a built in BMS with cell balancing, over-charge, over discharge, over
current and over temperature protection. Check out the full data sheet here: https://p.globalsources.com/IMAGES/PDT/SPEC/170/K1167638170.pdf

Question 2

There is conflicting information on whether these batteries can be wired in parallel (connected to double amp-hours). Can someone please clarify?

Accepted Answer

For the record, I have six 6-AH batteries in parallel for 36 AH, not six 8-AH ones, so no, I don't lose a third of the AH's. I see now that the smallest of these is now 8AH, but I bought mine when they sold 6's.   And NO, there is not only one way to wire in parallel.  A better way is to use the balanced way as I indicated.  Not sure where the "one way" comment came from, I suppose just never having heard of the "balance" wiring technique.

Question 3

What is the CCA on this 20ah battery?

Accepted Answer

If you read the description of this battery you will see that it is a deep cycle battery. Deep cycle batteries are not intended to be used for starting applications. They are not meant for high current such as what happens when starting a motor. They are meant for their current draw to be long and slower. That is why there is no CCA rating for this battery.

Question 4

Have anyone used this as a ups for computers?  i want to get rid of those home ups that i routinely discard every two to four years.

Accepted Answer

There are two problems with using these for any UPS that uses 24V wiring (or higher).

Wiring multiple batteries in series will mean that they will become unbalanced over time.  I solved that problem with a battery equalizer, about $20, a simple device that continuously equalizes the individual batteries in series.

The other problem is the BMS LVC (low voltage cut-off) in these batteries.  If the UPS fully discharges the batteries, the BMS will shut off and will not turn on again until the UPS supplies voltage.  However, my APC 1400 RMNET will not supply voltage until it detects voltage from the batteries.  So, you need to manually jump-start the batteries after that event, which is inconvenient.

There may be a way to hack this by using a low current isolated power supply that applies voltage to the batteries all the time just in case, or, perhaps, on a one-shot timer, but this is getting too complicated and poses electrical risks.

ASIN	B089VXSBC6
Battery Capacity	20 amp_hours
Battery Type	Lithium-Phosphate
Battery cell composition	Lithium-Phosphate
Brand	Miady
Brand Name	Miady
Compatible with Vehicle Type	Golf Cart
Customer Reviews	4.0 out of 5 stars 1 Review
Included Components	battery
Item Weight	1.8 kg
Item weight	1.8 kg
Manufacturer	Miady
Manufacturer Part Number	LFP20AH
Model Number	MI-LFP
Number Of Cells	4
Number of Items	1
Size	1 Count (Pack of 1)
Unit Count	1.0 Count
Vehicle service type	Golf Cart
Voltage	12 Volts

Miady 12V 20Ah Deep Cycle LiFePO4 Battery, 2000 Cycles LFP16AH Rechargeable Battery, Maintenance-Free Battery for Golf Cart, Boat, Solar System, UPS and More

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