Replacement battery pack for the Gavin Mini DPV

NI-MH batteries are quite sensitive to both exterme heat and cold. I left the battery pack for my underwater scooter in the garage during the winter. I think that is the reason why it never reaches full voltage during charge. I ordered 20 Tenergy F Size 1.2 V 13000mAh NiMH cells from http://www.all-battery.com/. It cost me about $260 + shipping and local tax.
A ready to use battery pack costs about $800 so you can save some bucks if you assemble your own.
The new battery pack is about 2.2 kg lighter than the original so i need to add some weights before diving.

I used PVC pipes and hot glue to make a stable pack
The batteries came with soldering tabs. However i found that i needed 40Amp heavy duty soldering bars instead.

Burn testing the battery pack with two 3 ohm 300W resistors to simulate the Scooter.
50 minutes burn time and still over 20V

The battery pack is ready and charged

Gavin Mini DPVs – Time for a dive