NOCO GENIUS2D direct-mount charger

The GENIUS2D is a 2 amp charger designed to be bolted into a vehicle or boat and left connected. It is 12 V only and lead-acid only, with no lithium mode.

Checked against sources on by the TrueAmps editorial team.

NOCO GENIUS2D direct-mount battery charger with ring terminals
Charge current
2 A
Battery voltages
12 V
Recharges batteries up to
40 Ah
Lithium (LiFePO4) mode
No
Weight
0.5 lb
Safety listing
UL 1236

Ratings are the manufacturer's own, from NOCO's spec page, checked September 24, 2026. Safety listing: ETL (Intertek), directory record, checked September 24, 2026.

See NOCO GENIUS2D on Amazon

Battery size it is rated to recharge

Largest battery each NOCO charger is rated to recharge. GENIUS2D: 40 Ah.GENIUS130 AhGENIUS240 AhGENIUS2D40 AhGENIUS5120 AhGENIUS10230 Ah
Recharge rating from NOCO spec pages. All are rated to maintain batteries of any size.

GENIUS2D or GENIUS2

Same current, different job. The GENIUS2 is a charger you carry to the battery. The 2D stays wired to it: NOCO ships it with a mounting bracket and short 24 inch cables, rates it for 140°F operating temperature (the GENIUS2 is rated to 104°F), and lists IP65.

The trade-off is chemistry. NOCO lists AGM, CA, EFB, gel, MF and wet lead-acid batteries, and no lithium. If the battery might become lithium one day, the GENIUS2 is the safer buy.

How long the GENIUS2D takes

Estimated hours from half charged to full, using the charge-time ratio in NOCO's own manuals. How the estimate works.

BatteryFrom 50%From flat
10 Ah3.8 h7.5 h
20 Ah7.5 h15 h
35 Ah13 h26 h

Nearest chargers in the range

ModelAmpsUp to AhLithium
NOCO GENIUS2D 240No
NOCO GENIUS2 240Yes
NOCO GENIUS5 5120Yes

All battery chargers side by side

GENIUS2D: questions people ask

Does the GENIUS2D work with lithium batteries?

No. NOCO lists lead-acid chemistries only for the GENIUS2D.

Check the GENIUS2D listing on Amazon