it fits electric bicycle like ECCOBIKE/ADDMOTOR/VOLTBIKE/CIVI/M2S/surface604bikes/Rambo 

1.Charge:Connect the battery packs to charge controller, and connect the charger to recharge port.

2. Discharge:Connect battery packs to load ,and connect load to discharge port.

3. once you connect the battery serial or parallels, if there are oxidation layer on the surface, you need to brush the surface to the metal glow with thin steel brush to lower connector resistance to the minimum resistance.

4. When combining with many batteries, if the voltage between the two electrodes is over 24V, the safe voltage for citizenry , to make sure the safety , you need to not touch the two electrodes along side your body.

5. If shelve an extended time suggested that the battery voltage 24-52V, need for normal recharging (even if not use), must charge and discharge for 3 months one time;

6. don't expose the battery to extreme heat or flame. 

7. don't short , over-charge or over-discharge the battery pack; 

8. don't disassemble or modify the battery pack. 

9. don't handle or store with metallic like necklaces, coins or hairpins, etc. 

10. don't reverse the polarity of the battery pack for any reason. 

11. don't immerse the battery pack in water or sea water, or catch on wet. 

12. Use a unbroken current, constant voltage (CC/CV) lithium-ion (Li+) battery charge controller.