The 2015 Honda Grom uses a 12-volt sealed lead-acid battery, typically the YTX5L-BS with about 4 amp-hours of capacity.
Battery type and capacity
For a lightweight, sub-125cc motorcycle, Honda selected a compact 12V battery that provides reliable starting power without adding unnecessary weight. The OEM specification is a 12-volt sealed lead-acid battery, commonly listed as YTX5L-BS, with an approximate capacity of around 4 Ah. This size is well-suited to the Grom’s engine and electrical load, including lights, ignition, and the small accessories that riders may use.
Stock specification by market
Honda’s official parts catalogs for the 2015 MSX125/Grom generally confirm the same electrical rating (12V, roughly 4 Ah) with the OEM battery model YTX5L-BS or its region-appropriate equivalent. If you’re in a different market or using a cross-reference, it’s wise to verify the exact part number and compatibility against your local dealer or the regional parts fiche for your VIN.
Replacement considerations
If you need to replace the battery, look for a 12-volt sealed lead-acid battery with a 4 Ah rating and the same general form factor and terminal layout as the OEM. The following options are commonly considered, but you should confirm fitment before purchasing.
- OEM-equivalent: YTX5L-BS, 12V, ~4 Ah — standard replacement choice for the Grom.
- Equivalent 12V, 4 Ah sealed lead-acid batteries from reputable brands that specify compatibility with motorcycles and the YTX5L-BS footprint.
- Ensure proper fitment: verify that the battery dimensions, terminal orientation, and venting align with the bike’s battery tray and wiring harness.
In practice, most riders stick with the OEM or an equivalent 12V 4 Ah battery that matches the form factor and terminal layout. Upgrading to a significantly larger capacity battery might require tray or mounting adjustments and could affect weight balance or charging performance. When installing a replacement, also check that the charging system is functioning properly to maintain battery health.
Summary
The 2015 Honda Grom uses a small 12-volt sealed lead-acid battery, typically the YTX5L-BS with about 4 Ah of capacity. Replacement should be a 12V 4 Ah battery with the same form factor and terminal layout; always verify regional part numbers and fitment against your bike’s specific VIN and dealer documentation. Maintaining proper charging and fitment helps ensure reliable starting and electrical performance.