Original ThunderSky Winston part number: WB-LYP40AHA, TSWB-LYP40AHA
Recommended initial and subsequent charging is to 3.65 V.
The minimum voltage is 2.5 V.
Maximum discharge current is 3C continously.
Operating temperature -45°C up to 85°C (discharging) Energy density is 82,5 Wh/kg
These battery cells are suitable for all traction applications including electric vehicles. Fully complies also for stationary applications - such as energy storage.
There is no Selfdischarging effect.
Can be recharged at any state of discharge - no memory effect
LiFePO4 is a very safe technology, not spontaneous combustion, does not react with moisture or with oxygen.
All cells are supplied new directly from the manufacturer.
|Please read USER MANUAL before use.|
|Do you have technical question? Try BLOG.|
Size of packs using 40Ah cells
8 cells, 24V
Total capacity 960 Wh / Depth 376 mm / Weight 12,8 kg
16 cells, 48V
Total capacity 1920 Wh / Depth 752 mm / Weight 25,6 kg
Capacity 120 Wh / Depth 47 mm / Weight 1.6 kg
4 cells, 12V
Total capacity 480 Wh / Depth 188 mm / Weight 6,4kg
LiFePO4 battery pack calculator
|The calculator provides recommendations based on your input.|
|The desired voltage of the final pack.|
|The required capacity of the pack.|
|Expected Depth of Discharge during use, what % discharge cycles you will use (ie. 100% DoD is full discharge every cycle).|
GWL Battery pack size calculator
It will help you to pick the best configuration for your needs.
You need Microsoft Office or other software capable of opening XLS files. The XLS does not contain any scripts and is safe to open. The file is stored at our internal protected storage. The file is free to share, commercial use only after agreement.
Initial, first time charging
Cells are precharged from manufacturer to conservation charge (usually 30-50%).
The cells have to be charged with low current before the first use.
The first charge should not exceed 0.5 C - eg for 40Ah cell is 20A.
FAQ: Initial charging information
For initial charging of multiple cells, connect them in parallel and the charger outputs should be connected to both ends of the parallel rows of cells, exactly as it is described here:
FAQ: The initial charging of the number of cells
We recommend to use chargers specially made for LiFePO4 cells First charge and initial balancing of the whole pack is important step towards long lifetime.
Alternatively you can use regulated (Laboratory) Power supply as initial charge tool. Short description how to proceed.
Balancing and protection
Demonstration video of BMS123 Smart Gen2 assembly
Important part of each battery pack is balancing and protection electronic. Most frequent solution is BMS123 Smart Gen3.
This Advanced solution for battery monitoring and management of LiFePO4 cells support Bluetooth connection with your phone, iPad, tablet or other device. Free Android and iOS application included.
Common connection diagrams for BMS,SBM
BMS123 Smart connection demonstration including Charger, Appliance and the ever important fuses and switches.
SBM is simple solution offering basic protection, diagram shows 16 cell version connected with charger and fuses.
Connecting the cells
Winston produce cells with easy to assemble square shape, terminals are made for screws allowing simple installation with spanner.
Interconnection between cells is important part of any battery pack. Original copper connectors are made of several thin layers for ideal flexibility and conductivity.
Make sure to clean oxidation from both, terminals and connectors (with Sandpaper or similar) before assembly. Oxided contacts may have very high resistance and cause unbalancing of the battery.
Plastic caps are cheap solution to prevent unwanted shortcuts and for easy plus and minus marking (red and black colors are available).
Demonstration video of cell assembly
Winston battery tests
Thundersky Winston tests
Series of destructive tests on Lithium Iron Phosphate (LiFeYPO4) cells ThunderSky Winston, learn how the cells behave in event of puncture by fire axe or intentional short-circuit with current up to 1600A (400C).
Result: LiFePO4 cells are extremely durable against physical abuse, does not endanger its surrounding even in moments of short-circuiting.
Expert Opinion: Chemical test of LFP during breakdown
|Nominal Voltage (V)||3.3|
|Cycle life for 80% DOD||>5000 cycles|
|Cycle life for 70% DOD||>7000 cycles|
|Internal Resistance (mOhm)||<0.7|
|Max discharge current (A)||400|
|Optimal discharge current (A)||20|
|Max charging current (A)||120|
|Optimal charging current (A)||20|