Chargers for motorcycle and powersports batteries
Match the charger to the Ah on your battery label. NOCO rates the 1 amp GENIUS1 up to 30 Ah and the 2 amp GENIUS2 up to 40 Ah. If your bike runs a lithium battery, the charger also needs a lithium mode, and all three chargers below list one.
Checked against sources on by the TrueAmps editorial team.
| Charger | Amps | Recharges up to | 12 Ah from half | Lithium | Amazon |
|---|---|---|---|---|---|
| NOCO GENIUS1 | 1 | 30 Ah | 9.0 h | Yes | NOCO GENIUS1 on Amazon (paid link) |
| Battery Tender Junior Multi-Chemistry | 1 | not published | 9.0 h | Yes | Battery Tender Junior Multi-Chemistry on Amazon (paid link) |
| NOCO GENIUS2 | 2 | 40 Ah | 4.5 h | Yes | NOCO GENIUS2 on Amazon (paid link) |
Ratings from manufacturer pages, September 24, 2026. Times use NOCO's 1.5 charge-time ratio; NOCO's GENIUS1 manual lists 9 hours for a 12 Ah battery from half charge.
Lithium needs its own mode
NOCO's GENIUS5 manual describes the lithium mode as for batteries "with Battery Management Systems (BMS) only" (user guide). If you have swapped the original lead-acid battery for a lithium one, switch the charger mode to match.
The Battery Tender Junior on Amazon is the Multi-Chemistry version with a lithium mode. Battery Tender's page separates it from the standard lead-acid-only Junior (SKU 021-0123), so check which one a listing is before you buy.
Winter storage
A smart charger with a maintenance stage can stay connected while the bike is parked. Trickle charger or maintainer explains the difference and why it matters for months on the tender.
Questions people ask
What size charger for a motorcycle battery?
Check the Ah printed on your battery against the charger's rating: NOCO rates the GENIUS1 up to 30 Ah and the GENIUS2 up to 40 Ah.
Can I charge a lithium motorcycle battery with these?
The NOCO GENIUS1 and GENIUS2 list lithium LiFePO4 support, and the Battery Tender Junior Multi-Chemistry has a lithium mode. NOCO's manual limits its lithium mode to batteries with a built-in battery management system.