I think the cordless would be a joke in any kind of emergency.... might be good for clearing some rain water from a dingy or a splash from a canoe...
If you had any kind of a scary leak, 200 gallons could come in faster than you could deploy the cordless pump.... a 2500 mounted and wired to a switch would be a far better backup... a on/off/on switch could be set to connect the pump to either of two batts in case one was dead.
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