I worked in the trucking business (mechanic) for about 40 years - half of which was in the Air Force/Air National guard. Every truck I ever worked on (civilian or military) had drain holes in the battery box and vents somewhere up high. When a battery is charging or discharging it puts off a gas, (H2S hydrogen sulfide) which is very flammable. If it is contained in a box and ignited it is also very explosive. You need a vent and a drain in your battery box. Look at the battery in your TV - I bet it's just sitting on (bolted to) a little metal or plastic tray - good ventilation and drainage.
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