April 22, 2026 · 6 min read
AGM vs Gel: An Honest Comparison of Two Sealed Technologies
Both are sold as 'sealed batteries', but their differences decide performance. Which technology fits which use? A clear, tabled comparison.
AGM and gel — both members of the VRLA (valve-regulated lead-acid) family — are often lumped together in the market. Yet how the electrolyte is held (absorbed in glass mat vs silica-based gel) creates two distinct characters.
Technical Comparison
| Criterion | AGM | Gel |
|---|---|---|
| High burst current | Superior | Good |
| Deep discharge tolerance | Good | Superior |
| Cycle life (50% DoD) | 400–600 | 500–750 |
| Hot environment tolerance | Moderate | Superior |
| Charging sensitivity | Flexible | Sensitive |
| Price | Lower | Higher |
Choose AGM if…
- You need high cranking power (start-stop cars, motorcycles, starter banks)
- You feed burst loads like winches and windlasses
- Budget comes first
Choose Gel if…
- You cycle deeply and regularly (caravan, boat house bank, solar)
- The environment is hot (engine rooms, heavy summer use)
- The battery will sit unattended for long periods — gel's self-discharge is very low
Bottom Line
When in doubt, this shortcut works: starting an engine → AGM; powering living space → gel. Browse our MPG gel series or tell us your scenario — we'll decide on the right technology together.
Frequently Asked Questions
Only if the charger has a dedicated gel mode. Gel batteries need lower charge voltage (typically 14.1–14.4V); continuous charging on an AGM profile creates permanent voids in the gel.
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