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By admin in Diving gear, Hillbilly/Backyard projects

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.

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

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

The battery pack is ready and charged

Gavin Mini DPVs - Time for a dive

Gavin Mini DPVs – Time for a dive

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