Lithium battery pack with battery management system for Efficycles which are usually used in nationwide competitions between all engineering colleges. The pack comes in various forms and is highly customisable as per the given ruleset. Usually it is in 24v with different amperes. A brief specification of a random battery pack is given below Specification: 1. Normal Voltage:24Volts. 2. Lifecycle: 800Cycles. 3. Capacity: 15Ah. 4. Charge Current: 5Amps. 5. Maximal Continuous Discharge Current: 15Amps. 6. Maximal Discharge Current: 30Amps. 7. Overvoltage Protection: 29.4Volts. 8. Undervoltage Protection: 19.25Volts. 9. Weight: 4Kg. 10. Chemical: Li-Ion .