The Honda Grom uses a 12-volt sealed lead-acid motorcycle battery, typically around 4–5 amp-hours.
In practice, most Grom owners use a 12V AGM/SLA battery in the 4–5 Ah range. Common replacements include models like YTX4L-BS or YTX5L-BS. Depending on market and year, slightly larger AGM batteries may fit, but you should verify the battery tray space, terminal layout, and cold-cranking amps for winter use. Always consult the owner's manual or the battery specifications for exact fitment.
Battery type and capacity
The Grom relies on a compact 12V battery. For everyday use, a 4–5 Ah AGM (absorbed glass mat) battery provides reliable starts and long life in a small footprint. AGM batteries are preferred for motorcycles due to their vibration resistance and minimal maintenance.
Model-year variations
Some markets or model years may use different sizes or terminal configurations. Always verify the exact fitment against your bike’s service manual or OEM part numbers before purchasing.
Common battery sizes for the Grom
Below are common replacement options that fit most Groms. Check dimensions and terminal orientation to ensure a proper fit.
- YTX4L-BS — 12V, about 4 Ah
- YTX5L-BS — 12V, about 5 Ah
- YTZ7S — 12V, about 6–7 Ah (may be larger; check fitment)
Note: If you ride in cold climates or use high-drain accessories, you may prefer a battery with higher CCA within the same size class. Always confirm positive/negative terminal orientation before purchase.
How to choose and install
To ensure you select the right size, measure the current battery and compare its length, width, and height to replacement options. Confirm terminal placement and polarity, and consider your local climate and starting needs. When installing, disconnect the negative terminal first, then the positive, and secure the battery with the original bracket or an appropriate replacement.
Summary
The Grom typically uses a 12-volt AGM/SLA battery in the 4–5 Ah range. Common replacement models include YTX4L-BS and YTX5L-BS, with attention to fitment, terminal orientation, and climate needs. Always verify with the owner’s manual or OEM specifications before buying and installing.
What kind of battery does a 2018 Honda Grom take?
The AJC-PS-ATX4L-522210 is the best replacement battery for the Honda MSX125 Grom 125CC Motorcycle Battery (2014-2018). What are the dimensions of the Honda MSX125 Grom 125CC Motorcycle Replacement Battery (2014-2018)? The dimensions are L 4.49 x W2. 76 x H 3.39 inches.
What size battery is in a Honda 125?
Honda CG125 (Electric-Starter) - 125 cc Batteries
| Brand | Dimensions (mm) | |
|---|---|---|
| YTX5L-BS | Yuasa | 114L x 71W x 106H |
| 504012008 | Varta | 114L x 71W x 106H |
| FTX5L-BS GEL | Fulbat | 113L x 70W x 105H |
| LT5-3 | Leoch | 113L x 70W x 105H |
What battery does a Grom need?
12V 3Ah YTX4L-BS Replacement for Honda Grom Battery - Compatible with Honda MSX125 125 CRF110F CRF110 CRF 110F CRF125F - 12 Volt Powersport Batteries, YTX4L AGM SLA.
What size battery does a 2020 Honda Grom take?
The AJC-PS-ATX4L-536914 is the best replacement battery for the Honda Grom 125 125CC Motorcycle Battery (2014-2020). What are the dimensions of the Honda Grom 125 125CC Motorcycle Replacement Battery (2014-2020)? The dimensions are L 4.49 x W2. 76 x H 3.39 inches.