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What is the replacement battery for the 3852 Controller?

The Controller in the 3852A contains a 3.7 V, 1.8 A-hr. lithium battery. Its part number is 1420-0345. The battery is soldered into the 03852-66523 PC board near the "Event In" BNC. This is the main PC board in the two-slot controller that is located to the left of slot 0 in the 3852A.