Lithium batteries don't self discharge like lead acid batteries so they can be stored for years, provided they are disconnected.
The balance thing is caused by a battery being maded from individual cells of slightly different capacity. More care in cell selection by the manufacturer will prevent balance issues. Bottom balancing (discharging all cells to the same low voltage) is safer than top balancing (charging all cells to the same high voltage). The Shorai charger top balances.
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