LFM vs LFX - What's the difference?

SHORAI LFM Lithium-Iron Powersports battery w/BMS, 6.0Ah 13.2V, "A" polarity, Case Type 1, Length 5.83" Width 2.63" Height 4.13". Shorai Batteries require a charging system output of 13.1 Volts or higher at idle, and must not exceed 15.2 volts at maximum output.

Case size #1, 148mm length, 66MM Width, 105MM Height

Specifications and Dimensions

Part +	Voltage Pb Eq	Polarity	A/HR	CCA (A)	Weight (KG)	Weight (LBS)	Max Charge Rate (A)
LFM18A1-BS12	12V		6.0	270	0.997	2.19	18