[Closed] connect 3x CREE LED lamps to 8.4 V?

I have a set of 3x CREE LED lamps, like those below. They have a 4x 18650 rechargeable battery pack to give 4.2 V; so are two pairs wired in parallel.

Can I connect the lamp to a pack with 4 cells wired in series, i.e. 8.4 V? (there are CREE LED lamps with such packs).

I do not know what is inside the lamps and I don't think it will be easy to dismantle them - but I have made my own LED lamps using a LED driver which takes a variable voltage (up to 18V or so) to provide the correct current.

In theory these should have drivers so should take a variable input voltage but how high can it go before they go pop, if indeed they do go pop?

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