Pre-order is now available for custom size lipo battery in 1S3P configuration that fits in 4xAA battery compartment and can be used in many GB projects!
Dimentions are 58x54.5x12mm, leads with JST PH 2.0 connector (fits Adafruit Powerboost) are 120mm long and capacity is 5100mAh - tested and confirmed.
Price for one battery with powerbank case (explanation why powerbank case in thread) and standard international shipping in 16.00€.
Optional priority signed for shipping is 3.00€ extra per order.
Pre-order ends on 5th March at 10PM CET and estimated delivery time is 8 weeks (details in thread).
Discussion in the forums: