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TEL TEL is offering a range of 48 V batteries in 19 inch rack assembly housings for for rack assembly which have the following advantages: better power performance than VRLA-Systems and therefor higher security of supply by higher capacity. smaller volume and lower weight makes the use of smaller housings possible. save use for a long time due to many possible cycles. better security of supply by lower service life dependency on higher temperatures and shorter recharge times. So finally Lithium-ion-batteries have a much better economic viability than VLRA-Systems due to the ability to have less aging versus temperature and provide in some circumstances up to 10 times more cycles than VRLA-batteries. The battery can be connected directly to the DC supply of the telecom equipment. The batteries are equipped with a high-end BMS-system (battery management system) which measures: Total cell set voltage Individual cell voltages Temperature Charge and Discharge Current Discharge Operation In the case of DC power is off, the discharge is controlled by a MOSFET so that the limits maximum current, minimum and maximum cell voltage, minimum and maximum temperature are never exceeded resp. fallen below. In case a parameter reaches its limit the discharge is switched off. Charge Operation After the DC power returns, the charge is controlled by a MOSFET the BMS charges the battery with a constant current-constant voltage regime (CCCV). During charging the BMS balances the cells via the bypass path (Transistor and Resistor). The charge is stopped if the first cell reaches the maximum cell voltage. The recharge is repeated under continuous float conditions after the cell voltages drop to certain (programmable) value. In case that the maximum cell temperature is exceeded the charge will be stopped and carried out after the temperature falls back under the limit. Visualisation For visualisation the BMS controls 3 LED, green, red and yellow. For visualisation of the operation modes the BMS has a LED bar to visualise battery empty and SOC (state of charge) after pressing a reset button. As an option the batteries with 2 or more height units can be equipped with OLED-display to visualise voltages, currents, temperatures and SOC.