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How do you know this? The tolerance on these capacitors is +/- 20%. While it is true that components from the same manufacturing batch should be fairly well matched, there is no guarantee of this. So if you had one that erred on the high side and one on the low, you could have a serious overvoltage on one of them. The ebay seller advises to charge them to 16 volts, discharge to 2 volts, repeat 6 times. I can only suppose this is to get them balanced. He doesn't mention that this applies to 6 capacitors in series, which might confuse some people. Anyway, he warns against just connecting them straight across the battery.
I am still waiting for the damn things to arrive so I can assess their behaviour for myself. But I think you'd be mad to not provide some kind of protection against overvoltage.
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