Exide INVA Queen INVA Queen has rugged internal elements required for withstnading frequent and long power cuts. It is housed in a light-weight, durable, beautiful polypropylene container making it the Queen of all Inverter batteries. You can proudly display it in your living room. The thick plates ensure a long life and its through partition inter-cell connections ensure an even better voltage profile on discharge. the result: a steady discharge during powercuts of logn duration and also enhanced service life. More over, it has got flat terminals and electrolyte level indicators, mak