The Starmax High-Temperature GEL Deep Cycle AGM Battery is a high-performance deep cycle GEL AGM battery designed for solar power systems, off-grid energy storage, wind power applications, sweepers, golf carts, and light industrial electric vehicles. Built for extreme temperatures (-15°C to 60°C), it features low self-discharge (2–3% per month at 25°C), a 50% DOD cycle life of over 3,000 cycles, and a float service life of 12–15 years. Supports fast charging and comes with CE, UL, ISO, and IEC certifications. Available in a grey body with black cover, it offers 1–3 years warranty depending on application, providing reliable, long-lasting power for industrial and renewable energy applications.
| Specification | Details |
|---|---|
| Model | Starmax SHTL12-20 (12V 20Ah) — High-Temperature GEL / Deep Cycle AGM (compiled) |
| Battery Type / Chemistry | GEL / VRLA or AGM VRLA (deep cycle) — sealed, maintenance free |
| Nominal Voltage | 12 V |
| Capacity (Nominal) | 20 Ah (10-hour / 20-hour rate, typical spec: 20Ah @ 20hr) |
| Rated Capacity at different discharge rates | Typical: 20Ah @ 20hr; ~18Ah @ 10hr; ~11–13Ah @ 1hr (varies by manufacturer/test method) |
| Internal Resistance (typ.) | ≤ 12–18 mΩ (fully charged, typical range from referenced 12V20Ah products) |
| Max. Discharge Current (5s short-term) | ~100–120 A (5 s) — short-circuit / high discharge capability shown on similar 12V20Ah datasheets |
| Recommended Charge Current | 0.1C – 0.3C (typical example: 2.0 A recommended float/charge range; limited charge current for GEL) |
| Float Charge Voltage (25°C) | ≈ 13.5 – 13.8 V (typical for GEL/AGM float) |
| Cyclic (boost) Charge Voltage (25°C) | ≈ 14.4 – 14.8 V (manufacturer-specific; GEL commonly lower than AGM) |
| Operating Temperature (Discharge) | -15 °C to +45 °C (typical range shown on similar CSPower 12V20Ah spec pages) |
| Storage Temperature (recommended) | -15 °C to +45 °C; recommend recharge after long storage (capacity retention: ~90% @ 3 months, ~80% @ 6 months for similar VRLA types) |
| Cycle Life / Design Life | Design floating life / long life variants listed up to “20 years” (float-design claim varies by series); typical deep-cycle GEL/AGM: hundreds of cycles depending on DOD and temperature |
| Dimensions (L × W × H) | Varies by case style — typical 12V 20Ah VRLA case dimensions are approximately 181 × 77 × 167 mm (example; confirm with Starmax datasheet) |
| Weight | ~6.0 – 7.5 kg (typical range for sealed 12V 20Ah lead-acid batteries; confirm with manufacturer) |
| Terminals | Faston / bolt / SAE variants depending on model — confirm with product listing |
| Max. Charging Current | Often specified as 0.25C – 0.3C maximum (i.e., ~5 A – 6 A) — check exact Starmax spec |
| Certifications | CE / RoHS / UL / ISO (varies by vendor and listing; check certificate pages) |
| Typical Applications | Solar / renewable energy, telecom backup, UPS, emergency lighting, mobility equipment, deep-cycle applications |
| Notes | This table was compiled from CSPower 12V20Ah datasheets, Starmax product/datasheet pages and general 12V20Ah listings on Made-in-China and Alibaba. Please verify dimensions, weight, terminal type and exact charge voltages with the official Starmax SHTL12-20 datasheet or supplier prior to publishing. |
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