I keep a siphon hose on my boat. $5 from either the big box or auto parts stores and has a little hand suction pump. It's not as fast as a bilge pump but in a case like yours, if the battery goes dead it may be the only way to get water out of the bilge.
If you're taking on water fast it won't help but it also does a good job of getting that little bit of water out of the bilge that the pump can't get.
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