For me, the best, cheapest, most reliable system is my $7.00 plastic battery water spout fill canister. It always adds the exact amount of water needed and I can service my 6-volts and engine battery in about 10 minutes a month. In addition, it forces me to inspect each battery for terminal corrosion and to insure they are still secure.
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Full Time in 2017 Newmar Ventana 4369
pulling a 24' enclosed (Mini Cooper/Harley/Kayak)
(traded 2014 Thor Challenger)
US Army 70-73 Retired LEO
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