http://www.eclipsebikes.com/headway-lif ... -1053.html
USA Site: $29.75 USD
http://www.headway-headquarters.com/401 ... dway-cell/
Spec:
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Single Headway 40152S LifePO4 Cell 15AH with screw terminal & high discharge rates. The cylindrical Headway cells are widely used in EVs including electric bikes, electric scooters, electric cars / hybrid electric cars, UPS batteries, storage batteries for solar power systems, starter batteries for cars & motorbikes etc.
Nominal Capacity: 15000mAh (0.5c)
Nominal Voltage: 3.2V
Max Charging Voltage: 3.65V ± 0.05V
Cut Off Discharge Voltage: 2.0V
Charging Method: CC/CV
Max Charge Current: 3C (45A)
Max Discharge Current (Continuous): 5C
Max Pulse Discharge Current (30 seconds): 10C (150A)
Recommended Discharge Current: 1C (15A)
Cycle Life: 2000 Cycles 1C 80% DOD
Self Discharge Rate (monthly): 2-3%
Energy Density: 100 Wh/Kg
Initial Internal Impendance: <6mΩ
Storage Temperature: One Month -20°C - 45°C Six Months -20°C - 35°C
Operation Temperature: Charge 0-45°C Discharge -20°C - 60°C
Diameter (mm): 40±1
Height (mm): 152.5±0.5
Weight: 480g
When tightening screw ends Headway specify tightening to 3Nm and maximum torque should not exceed 4Nm otherwise the cell could be damaged.
Warning - You should only attempt to construct your own battery pack if you have suitable electrical knowlegde. If you have no electrical experience we would recommend you consider purchasing a complete battery pack.
and still keep getting them each month
Every 4x months you can grow your Lithium Battery Group Clusters with a 15 extra Ah evey time you add a new group
15ah / 30 ah / 45ah / 60ah / 75ah / 90ah / 105ah
once you have 6 groups you can then use WC 110mm Soil Drain Soil pie to make them into a 12v 105ah Pipe module so you can move it around easy
and Srew Cap the pipe ends however in one of the caps has 2x Speakon 4 Pole connector sockets (allows you to Parallel Daisy chain 12v 105ah Pipe modules together yet also allows you to Parallel cell balance)
Speakon connector 4 Pole & 8 Pole specs
http://en.wikipedia.org/wiki/Speakon_connector
Speakon Sockets
Neutrik NL4MP-ST Speakon 4 Pole Panel Mount
http://www.amazon.com/Neutrik-Nlt4mp-Ma ... 000KH7SY4/
Speakon Plugs
GLS Audio Speaker Plug Twist Lock 4 Pole Speaker Plug compatible with Neutrik Speakon NL4FC, NL4FX, NLT4X, NL2FC, Speak-On - 4 PACK
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http://www.amazon.com/GLS-Audio-Speaker-compatible-Speak-On/dp/B00LW8VLRU/
Speaker Cable 12 Gauge 4 Conductor with Neutrik Speakon 4 Poles (5 Ft) Pro USA Made OEM
http://www.amazon.com/Speaker-Conductor ... 00R1XVP6W/
GLS Audio 50 feet Speaker Cable 12AWG 4 Conductor Patch Cords for Bi-Amp - 50 ft Speakon to Speakon Professional
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http://www.amazon.com/GLS-Audio-Speaker-Conductor-Bi-Amp/dp/B006H4VJD0/
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http://www.amazon.com/GLS-Audio-Speaker-Conductor-Bi-Amp/dp/B006H52L90/