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 | Value |
|---|---|
| Model | Starmax SHTL12-55 (12V 55Ah) |
| Battery type | Sealed VRLA — High-Temperature GEL / Deep-cycle (AGM/GEL style VRLA family) |
| Nominal voltage | 12 V (6 cells) |
| Nominal capacity (20-hr rate) | 55 Ah @ 20-hr rate (typical) |
| Capacity (other rates) | 10-hr ~50 Ah; 5-hr ~44 Ah; 1-hr ~33.6 Ah (example rates shown on similar 12V55 product pages) |
| Design floating life @25°C | HTD/HTL series: 12 years (AGM) — HTL (high-temp gel) design life quoted up to 15–20 years for specific HTL models at 25°C |
| Cycle life | ~1,750 cycles @ 50% DOD quoted for HTL high-temp gel designs (manufacturer series data) |
| Operating temperature (discharge / charge / storage) | Discharge/Charge/Storage ranges vary by series. Example HTD: Discharge/Charge/Storage −15°C ~ +45°C; HTL series claims operation from −40°C to +60°C (high-temperature series). |
| Max. discharge current | Example: 330 A (5 s) reported for HTD12-55 style 12V55 units on CSPower spec pages |
| Internal resistance (fully charged @25°C) | ≤ 9.6 mΩ (example value from HTD12-55 spec) |
| Recommended Float Charge voltage (25°C) | Typically around 13.5–13.8 V (manufacturer series pages give float and cycle charge windows; verify exact model spec before final installation) |
| Recommended Cycle charge voltage (25°C) | Typically around 14.4–14.8 V (see manufacturer charging parameters on product page) |
| Self-discharge | Low self discharge — exact %/month not always listed (VRLA designs normally ~3%/month at 20–25°C, check vendor sheet for model) |
| Terminal type | T6 / M6 or threaded insert style on many 12V55 VRLA models (confirm on the exact Starmax SHTL12-55 datasheet you receive from the seller) |
| Dimensions (L × W × H) | Typical 12V55 form: ~197 × 165 × 170 mm (example listing — confirm exact model measurement with supplier) |
| Weight | Typical range 15–17 kg for gel/VRLA 12V55 batteries (market listings show ~17 kg for similar Starmax 12V55 models) |
| Warranty | Varies by seller — marketplace listings commonly show 12 months; manufacturer series pages reference multi-year design life but check seller warranty terms. |
| Certifications | CE / ISO9001 / IEC 60896 series / UL on some product lines — check product certificate pack for the specific SKU. |
| Applications | Solar & off-grid energy storage, telecom backup, UPS, motive & electric sweepers, forklift, general deep-cycle use where high temp performance needed |
| Manufacturer / Brand | Starmax (model family listed on supplier/manufacturer pages — CSPower / CSPBattery are listed OEM / factory sources for similar HTL / HTD 12V55 products) |
| Notes & sources | Primary technical specs pulled from CSPBattery / CSPower product pages (HTL / HTD / CS 12V55 family) and cross-checked with marketplace listings (Alibaba, Made-in-China) and distributor product pages for Starmax 12V55 variants. See citations below for the exact pages used. |
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