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Sunpays lithium battery- new vs old

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i installed a 48v 4.8kva lithium battery purchased from Sun pays about 2 months ago. i have been told that the new lithium battery which is now touch screen cannot be combined with the existing battery and there is no stock of the old model similar to mine. Does anyone know what battery would be compatible with this or who is the manufacturer of sun pays lithium batteries?

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