fix: increase capacity of lead-acid grid batteries

[chaosvolt]

Purpose of change

Back when I was updating battery power density figures, turns out I'd updated grid storage batteries but forgot about grid vehicle batteries, for which some values changed, hecc.

Describe the solution

1. Updated capacity of mounted car battery from 2500 to 3000, matching its item form.
2. Updated capacity of mounted motorbike battery from 500 to 600, matching its item form.
3. Updated capacity of mounted small motorbike battery from 150 to 300, matching its item form.

Describe alternatives you've considered

Forgetting about it again.

Testing

1. Checked affected file for syntax and lint errors.
2. Used my eyes.

Additional context

Capacity was changed back in: #3877

Checklist