Patent ID: 9419445
Filing Date: 2016-08-16
CPC Classification: H01M,H02J,Y02E,Y02P

Claim Text:
1. A method for extending battery power at cell sites, said method comprising a step of charging a VRLA-Li-ION battery combination with a single charger circuit, said step of charging the VRLA-Li-Ion battery combination comprising the following steps: defining a pre-set current limit for the charger circuit; charging Li-Ion battery and VRLA battery with a float voltage; monitoring a charging current and a terminal voltage of the VRLA battery; determining a frequency and a duty cycle of one or more pulses for pulse charging of VRLA batteries; bringing the VRLA battery to an offline mode by determining a state of charge of the VRLA battery and making a pulse width to zero; discharging the Li-ION Battery at an initial stage; and using the VRLA battery to power the load as Li-Ion battery discharges to a pre-set charge limit.