The most common terminals found on SLA batteries nowadays are the F1 and the F2 terminal. While the two may be visually similar, there are differences between the two when it comes to specifications. The only difference that is visible to the naked eye is that the F2 is wider than the F1. However, batteries with F1 terminal connectors are commonly used for general-purpose applications and they are not meant to be discharged fully over a short period of time, and batteries with F2 terminal connectors can provide you with better output and feature High Rate Discharge Design.
The F stands for Faston connector which is the battery terminal. This battery terminal is also known as a blade terminal. This is usually a metal tab which protrudes from the top of the battery and is bent at a 90 degree angle with a tapered narrowing end.
The main purpose of the two terminals is to facilitate an easy connection between two circuits without hardwiring them. The electronic device being connected to the terminal will have wires which will be attached to the female barrels of the terminals.
These terminal connectors are usually attached to SLA batteries of up to 12V and 18AH.
Specifications of the F1 and F2 terminals
The F1 Faston tab is also known as the no.187 because of its width. Being 0.187 inches wide, these small terminals are equal to about 4.75mm. If an F2 terminal isn’t available and a larger connector is required then you can use an adapter to attach the F1. The adapter makes the F1 compatible with other F2 connector types.
The F2 Faston tab is also known as no.250 because it is 0.25 inches wide which is equivalent to 6.35mm. While the difference between the two is minimal (about 1/16 inch), it is best to use the terminals for their specific purposes.
F1 (T1) - Faston Terminal
F2 (T2) - Faston Terminal