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vinny what is a halford? I am not familiar with the term. . .
And batteries are always good especially when free. When you upgrade packs you might be able to launch a new EV vehicle or use them in your home to store captured energy(solar or wind).
The only real maintenance they need is to be charged frequently and avoid discharging them below 30% and they will lost a very long time(phone companies buy up old Lead-Acids to power their systems(your landline phone) when the power goes out). Could find your local landline company and ask them if they have any batteries although, those are going to be pretty far gone.
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