I believe that they use the JST-EH type, which with some trimming/modification and careful application can fit inside JST-XH as they have the same pin spacing. Otherwise, these balance taps are probably the rarest type of the common ones, but they're used by LRP/Nosram, Kokam OEM and Graupner.
If you need to charge them a lot (not a one off) it's definitely worth getting the correct adapter or breakout board, depending on your charger.
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