Cdn Tire booster pack needs battery (Browns Line/Lakeshore)

Older (2007) Canadian Tire MotoMaster 12VDC booster pack for starting vehicles, has built-in air (tire) compressor, 12VDC cigarette lighter socket for 12V accessories, and 120VAC inverter with 2 120V sockets capable of supplying non-sinusoidal AC power up to 320 watts continuous.
IMPORTANT: THIS UNIT NEEDS A NEW BATTERY of sealed lead-acid type, 12v 18-21 Ahr capacity, preferably AGM construction, available at some local battery supply houses. THIS BATTERY WOULD COST YOU IN THE $100 + RANGE.
I have replaced the battery once already, back in 2011 for cost of $72+ tax. I have since stopped using this unit (when the replacement battery died, as all L-A batteries eventually do) and have changed to using a smaller size Lithium -Ion booster pack.
This unit would be suitable ONLY for someone who is knowledgeable enough and capable of replacing the battery & reassembling the booster pack safely & properly.
Can be picked up curbside upon making appointment for date & time. Only reply if serious to pick up.

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