Holds 1 W126S battery well. If you try to hold two, as one reviewer suggested, it gets pretty tight and you'll need to use a strap/strap holder for that purpose. The waist belt/holder is not very convenient to use as it is firmly attached with velcro. I find the fact that the flap closes on the same side as the belt/belt holder uncomfortable to say the least. I don't think the battery will fall out if the lid is closed the other way around, the velcro keeps it closed tightly.
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