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Also, here is a handbook (MIL-STD-633E-10 22 February 1980) that provides operational specs for various generators including the MEP-002a.
You will find the MEP-002a beginning on printed pg 55 (PDF pg 61).
Yes, its normal for the batteries to emit a small spark when connecting them after they have been disconnected. There are several capacitors in the electronics (voltage regulator, etc.) that will draw a small current to recharge them when connecting up the batteries.
Best to invest in a...