Buyer's guide

Does charging from a power point damage your EV battery?

Some owners worry a 'granny charger' is bad for the battery. It's the opposite.

The short answer

No. Slow AC charging from a power point is the gentlest way to charge an EV battery: the low current produces little heat, and heat is what ages batteries fastest. Frequent DC fast charging, sitting at 100% for long periods, and extreme heat do more harm. Follow your manufacturer's advice on daily charge limits; many cars with LFP batteries are happy to charge to 100% regularly.

  • Slow is gentle: 2–3.5 kW is a fraction of what a battery can accept.
  • Daily limit: many NMC-battery cars recommend 80–90% for daily use; LFP cars often recommend regular charges to 100%. Check your manual.
  • Plug in often: shallow nightly top-ups are easier on a battery than deep cycles.
  • Safe hardware matters more: an RCM-registered charger like the SEVR 10A portable charger.
The science, briefly

What actually ages an EV battery

  • Heat. High temperatures speed up the chemical reactions that wear cells. Slow charging generates very little.
  • High state of charge for long periods. Leaving an NMC battery at 100% for days is harder on it than 80%.
  • Lots of DC fast charging. High power means more heat and stress. Occasional fast charging on trips is fine.
  • Deep discharges. Regularly running close to 0% adds wear. Nightly top-ups avoid it.
LFP vs NMC

Which battery does your car have?

LFP (lithium iron phosphate)NMC / NCA (nickel-based)
Common inMany BYD models, Tesla Model 3 and Y RWD, MG4 Excite and other entry variantsLong-range and performance variants of many brands
Typical daily charge adviceOften 100% regularly (so the car can calibrate)Often 80–90% for daily use, 100% before trips
Heat toleranceGoodGood, but more sensitive to time at high charge
Chemistry varies by variant and model year. Your owner's manual or the car's charging screen is the authority.
Our pick

Chargers we recommend

No install needed

SEVR EV Portable Charger (10A)

Type 210 A max2.3 kW~13 km/h4.5 mIP66

Slow, steady 2.3 kW charging from any power point.

$183.99Lowest price in Australia · free shipping · 3-year warranty
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Questions

Frequently asked

Is slow charging better for an EV battery?

Generally yes. Slow AC charging produces less heat than DC fast charging, and heat is the main thing that ages a battery. Charging from a power point is about as gentle as it gets.

Is it bad to charge my EV every night?

No. Frequent shallow top-ups are easier on a battery than running it low and filling it up. Set the charge limit your manufacturer recommends.

Should I charge my EV to 100%?

It depends on the battery. Many LFP-battery cars recommend charging to 100% regularly; many nickel-based batteries recommend 80–90% for daily use. Follow your manual.

Does a granny charger wear out the battery faster?

No. The battery doesn't care what the charger is called; a portable charger simply delivers power slowly, which is easy on the battery.

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