Frequently Asked Questions
What is the difference between the Trojan J250P and J250G?
The Trojan J250P and J250G are both 6 volt flooded deep cycle batteries designed for demanding industrial applications, but they have a few important differences. The J250P offers a higher capacity of 250Ah, while the J250G is rated at 235Ah, giving the J250P longer runtime between charges. The two batteries also use different terminal configurations and have slightly different dimensions. If you're replacing an existing battery, always verify the terminal type, battery tray size, and your equipment manufacturer's recommendations before selecting a replacement.
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Specification
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J250P
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J250G
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Voltage
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6 VDC
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6 VDC
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Capacity (20 Hr)
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250 Ah
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235 Ah
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Weight
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72 lbs (32.66 kg)
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67 lbs (30.39 kg)
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Dimensions
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11.66 x 6.94 x 11.54 in
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12.17 x 6.85 x 11.43 in
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Terminal
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Automotive Post & Stud (DT)
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Universal Terminal (UT)
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Best For
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Longer runtime
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Applications requiring
universal terminals
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Which battery should I choose when it comes to J250P & J250G?
The most important consideration is compatibility with your equipment. Always verify battery dimensions, terminal style, and manufacturer recommendations before purchasing.
Choose the J250P if:
- You want the longest runtime.
- You are replacing an existing J250G.
- You want higher amp hour capacity.
Choose the J250G if:
- Your equipment requires a universal terminal.
- Your equipment uses the DT automotive post and stud terminal.
- Your battery compartment is designed around its dimensions.
Can the J250P replace the J250G?
In many cases, yes, but compatibility should always be verified first. Since both batteries are 6 volt deep cycle flooded batteries, the J250P can often replace a J250G if your equipment has adequate space and the terminal configuration matches your existing cables. Because the J250P has a slightly higher capacity and different dimensions, it's important to confirm the battery compartment measurements and terminal requirements before purchasing.
What equipment or application uses the Trojan J250P?
The Trojan J250P is commonly used in equipment and systems that require reliable deep cycle power and extended operating times. Popular applications include off-grid solar installations, WAVE PoE systems, floor scrubbers and sweepers, scissor lifts, boom lifts, material handling equipment, industrial cleaning machines, agricultural and ranch equipment, and remote monitoring systems. Its high capacity also makes it an excellent choice for custom battery bank applications where long lasting, dependable energy storage is essential.
Can I use the Trojan J250P in an RV?
Yes. The Trojan J250P is commonly used in RVs that require dependable deep cycle power for lights, water pumps, fans, refrigerators, and other 12V appliances when connected in the appropriate battery bank. Keep in mind that flooded batteries require ventilation and routine maintenance, making them better suited for battery compartments designed for flooded lead acid batteries.
How long does a Trojan J250P battery last?
Battery life depends on how the battery is used and maintained. Factors such as depth of discharge, charging habits, operating temperature, and regular maintenance all affect service life. With proper charging, routine watering, and avoiding excessive deep discharges, a Trojan J250P can provide many years of dependable performance. In real world use, a properly maintained J250P commonly provides 4 to 8 years of service, although some applications may see a shorter or longer lifespan depending on operating conditions. Heavy daily use with deep discharges will shorten battery life, while lighter use with proper maintenance can significantly extend it. Following Trojan's recommended charging and maintenance procedures is the best way to maximize battery life.
How do I maintain a Trojan J250P battery?
The Trojan J250P is a flooded lead acid battery that requires regular maintenance to deliver reliable performance and maximize its service life. Unlike sealed batteries, flooded batteries require periodic inspection to ensure the electrolyte remains at the proper level. Regularly check the electrolyte level and add distilled water only when necessary. Never use tap water, as minerals and impurities can reduce battery performance and shorten its lifespan. Keeping the battery fully charged whenever possible also helps prevent sulfation, a common cause of reduced battery capacity and premature failure. Inspect the battery terminals and cable connections on a routine basis. Clean away any corrosion that develops on the terminals and make sure all cable connections are tight and secure. Loose or corroded connections can reduce charging efficiency and cause unnecessary voltage loss.
After each use, recharge the battery as soon as practical rather than allowing it to remain in a discharged state. If the battery will be stored for an extended period, fully charge it before storage and periodically check its charge level to prevent self discharge. With proper charging, regular watering, clean terminals, and routine inspections, the Trojan J250P can provide years of dependable deep cycle performance. Following Trojan's recommended maintenance schedule is one of the best ways to maximize battery life and ensure consistent operation.
How do I know when the battery needs water?
The electrolyte should always cover the battery plates. Inspect the water level after charging. If the level is below the recommended fill line, add distilled water. Never allow the plates to become exposed, as this can permanently damage the battery.
What charger should I use with the J250P?
Use a charger specifically designed for 6 volt flooded lead acid deep cycle batteries that follows Trojan's recommended charging profile. Smart chargers with multistage charging are recommended because they automatically adjust charging voltage during bulk, absorption, and float charging. Using the proper charger helps maximize battery performance while reducing the risk of undercharging or overcharging.
Can I use the J250P in a solar power system?
Yes. Although the J250P was originally designed for industrial motive power applications, it is a true deep cycle battery and can be used in many off-grid solar systems. It works well for applications such as remote monitoring, security cameras, WAVE PoE systems, cabins, agricultural equipment, and communication systems. For larger solar installations with daily cycling, Trojan's renewable energy battery series may be a better option, but the J250P remains an excellent choice for many small to medium sized solar projects.
Can the Trojan 250P be installed indoors?
Yes, but only in a properly ventilated battery enclosure. Flooded lead acid batteries produce hydrogen gas during charging. Without adequate ventilation, hydrogen can accumulate and become hazardous. Indoor installations should include:
- Good natural or forced ventilation
- Protection from sparks or open flames
- A sturdy battery enclosure
- Easy access for routine maintenance
Many off-grid homes, cabins, and backup power systems safely use flooded batteries indoors when installed correctly.
How many Trojan J250P batteries do I need?
The number depends on your system voltage and energy requirements. Connecting batteries in series increases the system voltage while keeping the amp hour capacity the same.
- (2) batteries for a 12VDC system
- (4) batteries for a 24VDC system
- (8) batteries for a 48VDC system
The total battery capacity you need depends on your daily energy consumption, expected backup time, and the maximum depth of discharge you plan to use.
Is the Trojan J250P recyclable?
Yes. Lead acid batteries are among the most recycled consumer products in the world. According to Trojan, approximately 99% of a lead acid battery can be recycled, including the lead, plastic case, and electrolyte. Most battery retailers and recycling centers accept used lead acid batteries for proper recycling.
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