john a durden, would this internal regulator in each battery be a problem when put in series?

Thank you for your inquiry. The internal BMS of the battery allows for a 2s configuration for 24V, so you can put up to two of these batteries together in series without issues,

how much does each one weigh?

I didnt weigh them but the pair were lighter than one lead acid equivalent.

In your ad, 4 are connected in series for 48vdc, but elsewhere you state max 2. i need 4 in series for a smart2200rm2u ups. will these work?

The latest version of this battery does support 48V series wiring connection. However, we might not recommend using these batteries in a UPS system that has the SLA/ AGM batteries as the original batteries, because the built-in charger is designed to charge SLA/ AGM batteries that might not be able to provide LiFePO4 lithium battery sufficient charging and it might also cause damage to the batteries in long term use.

ASIN	B08WFQCRZR
Battery Cell Composition	Lithium Ion
Battery Composition	Lithium Ion
Brand	ExpertPower
Brand Name	ExpertPower
Compatible with Vehicle Type	Passenger Car
Country of Origin	USA
Customer Reviews	4.1 out of 5 stars 354 Reviews
Item Dimensions D x W x H	6.6D x 15.2W x 9.4H Centimeters
Item Weight	1.23 kg
Manufacturer	ExpertPower
Manufacturer Part Number	EP1210-2
Number Of Cells	6
Size	2 Count (Pack of 1)
Terminal	F2 Terminal
UPC	840140941685
Vehicle Service Type	Passenger Car
Voltage	12 Volts , 12.8 Volts

ExpertPower 2 Pack 12V 10Ah Lithium LiFePO4 Deep Cycle Rechargeable Battery | 2500-7000 Life Cycles & 10-Year Lifetime | Built-in BMS

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