What changes when the old bank comes out: charger, wiring, weight and expectations.
What has to change in the system
The charger profile changes first, then the mounting, then your expectations about runtime — lithium delivers more of its rating.
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Weight, space and cost expectations
Lithium is lighter and smaller for the same usable energy, and pays back through replacements avoided.
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Questions
Short answers to the ones that come up most.
Can I keep my old charger?
Only if it has a lithium profile. Otherwise it will overcharge the pack and the BMS will keep disconnecting.
Is the wiring still suitable?
Usually yes — lithium holds higher voltage under load, so the same cable performs better.
Do I need to change the alternator?
In vehicles, add a DC-DC charger or a lithium-aware regulator.
