The 33.6V 3.5A rechargeable lithium ion battery charger provides the fastest possible way to recharge a 8S cell pack without overcharging it, eliminating any possible damage. The rechargeable lithium battery charger incorporates pre-charging processes to recover deeply discharged batteries by using latest activation technology. Its built-in microprocessor control constantly senses the condition of the rechargeable li ion battery during the whole charging process, and provides the accurate Amperage and Voltage to the battery based on the designated charging stage requirements.