Product Description
12.8V 20Ah Lithium UPS Battery Replacement
The Rich Solar RS-B1220 12.8V 20Ah LiFePO4 Battery delivers reliable and efficient power for RV, marine, off-grid cabin, and backup power applications. Built with Grade A+ LiFePO4 cells, this advanced 12.8V 20Ah lithium battery provides 256Wh of clean energy with an outstanding 3,000+ cycle life and very low self-discharge. The integrated BMS offers complete protection from electrical and thermal issues while the durable UL94 V-0 flame-retardant housing ensures safety and longevity. Designed to operate in extreme temperatures from -4°F to 140°F with charging capability from 32°F to 131°F, it is the ideal maintenance-free solution for customers who demand dependable performance and easy system expansion up to four parallel units.
Features & Benefits
- Grade A+ LiFePO4 Cells – Exceptional long-term performance and consistent power output for thousands of cycles.
- Advanced BMS – Protection from over-charge, over-discharge, over-current, and temperature extremes.
- 3,000+ Cycle Life – Ensures years of reliable service with far greater longevity than lead-acid batteries.
- Low Self-Discharge – Maintains a charge longer standard SLA batteries during extended stand-by periods.
- Wide Temperature Range – Operates reliably from -4°F to 140°F, and charges from 32°F to 131°F.
- Parallel Expansion – Connect up to 4 in parallel to scale capacity to your power needs (80Ah max).
- Lightweight – Roughly 1/3 the weight of an SLA equivalent at only 4.6 lbs for significant weight reduction.
- Direct-Fit* – Replaces Duracell DURA12-18NB, DURDC12-20C, DURDC12-20NB, plus many others.
- Flame Retardant – UL94 V-0 certified makes it a great replacement for the DURA12-18C/FR.
- M6 Terminals – 6mm threaded insert terminals with new hardware included.
- M5 Adapter Kit – Optional M5 adapter kit available for devices with 5mm ring terminals.
* LiFePO4 charger required if upgrading from non-lithium batteries.
Why Choose Rich Solar for a Lithium UPS Battery?
Rich Solar has established itself as a trusted leader in the renewable energy sector by consistently delivering innovative, high-performance products designed for long-term durability. The RS-B1220 20Ah lithium battery exemplifies their dedication to quality through premium Grade A+ cell construction, rigorous safety certifications, and thoughtful features like parallel expandability and broad temperature tolerance. This battery not only outperforms traditional lead-acid alternatives with far greater cycle life and efficiency but also provides users with the confidence of advanced multi-level protection and zero-maintenance operation. Whether you're replacing SLA batteries in emergency systems, powering medical equipment, or creating a resilient off-grid energy system, choosing Rich Solar ensures you receive a LiFePO4 battery engineered for durability, safety, and customer satisfaction that stands the test of time.
| Battery Type | Lithium (LiFePO4) |
| Nominal Voltage | 12.8 Volts |
| Capacity | 20Ah |
| Energy | 256Wh |
| Maximum Continuous Discharge |
30 Amps |
| Charging Current |
10A (20A max) |
| Charging Voltage |
14.4 Volts |
| Low Voltage Cut-Off |
10.0 Volts |
| Length | 7.10" (180 mm) |
| Width | 3.10" (79 mm) |
| Height | 6.50" (165 mm) |
| Weight | 4.6 lbs (2.1 kg) |
| Terminals | M6 Inserts |
| Polarity | - Left / + Right |
| Operating Temperature |
-4°F - 140°F (-20°C - 60°C) |
| Charging Temperature |
32°F - 131°F (0°C - 55°C) |
| Parallel Connections |
Up to 4 (80Ah) |
| Series Connections |
N/A |
| Cycle Life | 3,000+ |
| Certifications | UL94 V-0, UL 1642, CE, UN 38.3 |
| Warranty | 1 Year |
Rich Solar RS-B1220 Battery Cross-Reference
12V 18Ah Batteries with M5 Terminals: 45570, BC18-12, CA12180, CB12180-IT, CP12180I-FR, DURA12-18C/FR, ES18-12I-FR, ES20-12C FT, ES22-12, EXP12180-GEL, GP12180I-FR, LC-X1218I-FR, LCR12V18I-FR, ML18-12I-FR, ML18-12XRP, NP12-18Ah, NP18-12I-FR, PE12V18I-FR, PK12180I-FR, PS-12180 B, PS-12180 FR, PS-1280HD M5, PS12180I-FR, SCP12180 M5, SLA12-18I-FR, SLAA12-18C/FR, UB12180, UB12180I-FR.
12V 18Ah Batteries with Nut & Bolt Terminals: CB12180-NB, CF-12V18, CP12180NB, D5745, DURA12-18NB, ES17-12, ES17-12G, ES18-12NB, ES22-12C , EXP-12180, GP12170-NB, GP12180-NB, LC-X1218NB, LCR12V18NB, ML18-12NB, NP18-12NB, NPY18-12, PE12V18NB, PK12180-NB, PS-12180 NB, PXL12180, SCP12180 NB, SLA1116, SLAA12-18NB, SP12-18, TLV12180, UB12180-NB.
12V 20Ah Batteries with M5/M6 Terminals: CB12220-IT, CP12200, CT750, DCM0020, DURDC12-20C, ES20-12C FT, ES20-12C FT FR, ES22-12, GP12200, LC-X1220P, LCR12V20P, ML20-12, NP20-12, PDC-12200 M5, PE12V20, PK12200, PS12200 M5, RS-B1220, SCP12220 M5, SLADC12-20C, SLA12-20, SLADC12-20C, UB12220, V20-600.
12V 20-22Ah Batteries with Nut & Bolt Terminals: 12N20-3B, 40696, CB12220-NB, CP12200NB, DCM0120, DURDC12-20NB, ES20-12C, ES20-12FR HR, ES22-12C, EXP-12200, GP12200-NB, LCR12V20P-NB, ML20-12NB, ML22-12, NP20-12NB, PE12V20-NB, PK12200-NB, PS-12200 NB2, PWL12V28, SCP12220 NB, SLA12-20NB, UB12220-NB, WKDC12-20NB.
Warning: LiFePO4 charger required if upgrading from non-lithium batteries.