Turns out LR44 are batteries for watches, each one cost RM8. The YF-19's Fold booster needs 3 of them to operate! This sure is getting costlier...
With all the extras loaded, YF-19 becomes a pretty impressive looking piece!
Gerwalk:
The Fold booster is only able to mount in Fighter mode though. The Fast packs consist of the leg armor which attaches by magnet and the fuel pack which hooks at the shoulder. In my case, they don't really fit well. Getting them all to align is Fighter mode is probably the most annoying part...
Battroid:
And here's the moment we've been waiting for: switch off the lights and turn on the Fold booster!
The Fold booster lights up and dance~~ watch the video too!