Electrical Help Please

Coupla things.
The jobber was right, you can't get an accurate test on a dead battery, it needs to be fully charged before testing, and I'm not sure if a trickle charger could charge a dead battery sufficiently.
They may have wanted to "charge" it properly first, we would.
Hydrometer test prob not.
If you can, charge it properly overnite, - take it back and tell them it's got all the charge it'll take, load test it . .
jmo