The D250SE (CTEK Part No. 40-315) is a DC to DC fully automatic charger that’s designed to charge a Service Battery and is powered by the alternator/starter battery. With dual inputs the D250SE is also solar compatible (a standard solar controller is not necessary). The D250SE charger supplies up to 20A of power to any 12V lead-acid or lithium service battery from 40–300Ah. It also works if the starter battery and service battery are different chemistries, for example if the starter battery is lead/acid and the service battery is lithium. (Note: a service battery may also be called an auxiliary/aux battery, house battery, secondary battery, or backup battery.) This is a great charger for our V1 and V2 Lithium Deep Cycle Batteries.
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Description
CTEK D250SE 12V Smart Charger 20AThe D250SE (CTEK Part No. 40 315) is a DC to DC fully automatic charger thats designed to charge a Service Battery and is powered by the alternator starter battery. With dual inputs the D250SE is also solar compatible (a standard solar controller is not necessary). The D250SE charger supplies up to 20A of power to any 12V lead acid or lithium service battery from 40300Ah. It also works if the starter battery and service battery are different
Dual Inputs
The D250SE CTEK Charger has dual inputs and can charge the service battery from the alternator or a solar panel or both. The charger is designed to work with smart alternators and can still operate if the alternator is shut off but the vehicle has access to solar or wind power. So it can use power from the alternator, solar panel, wind power, or any DC power source can be used through the solar input port (within voltage spec). The D250SE can also charge the service battery from the solar input and the alternator in parallel using its built-in regulator to save fuel.
Optimum Charge
Continuous charging while the vehicle’s on the move means the batteries are fully charged in the shortest possible time. The built-in temperature sensor compensates for hot or cold conditions to prevent the battery from overheating or overcharging, so it always gets the optimum charge.
When the service battery being maintained is fully charged, the D250SE will automatically redirect overflow charge power to top-off the starter battery. The D250SE can maintain a stable output up to 20A to vehicles fitted with smart ECU controlled alternators.
LITHIUM
5-Step Program
- Accept*: Tests if the battery can accept charge. This step prevents that charging proceeds with a defect battery. (*Step 1 for lead/acid is Desulphation)
- Bulk: Charging with maximum current until approximately 90% battery capacity*. (80% capacity for lead/acid.)
- Absorption: Charging with declining current to maximize up to 95% battery capacity*. (100% capacity for lead/acid.)
- Float: Maintaining the battery voltage at maximum level by providing a constant voltage charge.
- Pulse: Maintaining the battery at 95–100% capacity. The charger monitors the battery voltage and gives a pulse when necessary to keep the battery fully charged.
Video about D250SE Charger
Specs
- CTEK PN: 40-315
- Input: 11.5–23V, 25A
- Output: Max 14.4/14.2/14.7V, 20A max
- Back-Current Drain*: Less than 1Ah/month
- Ambient Temperature: -4°F to +122°F (-20°C to +50°C)
- Battery Types: 12-Volt WET, EFB, Ca/Ca, MF, AGM, GEL, Lithium (LiFePO4, Li-Fe, Li-iron, LFP)
- Battery Capacity: 40–300Ah
- Insulation class: IP65 (splash and dust proof)
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 1
Pleased be careful
Color: Black
Please be very careful when using this. After using it 2 times it opened cans just fine. Then it stop opening cans and will make hair like strains of metals and one would think its hair and pull on it thus Cutting your fingers open. That’s what happened to me. Please be careful.
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Reviewed in the United States on May 16, 2026
★★★★★ 4
Quit working after 30 days
Color: Black
This can opener worked fine for the first couple of weeks. It stopped working several days ago and even though I had recharged it, it would not turn on. I thought I would give it another try before I threw it away since I was past the refund period so I could not return it. I made 100% sure that it was plugged in securely and it did charge and worked today. Make sure that it is plugged in securely when charging. Hopefully it will continue to work and if not I will update my review.
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Reviewed in the United States on March 11, 2026
★★★★★ 5
Used almost daily.
Color: Black
This electric can opener you set and forget. It works on various sizes and types of cans. The size makes it easy to store.
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Reviewed in the United States on May 11, 2026
★★★★★ 5
USB Rechargeable Electric Can Opener
Color: Black
Item review update! Disregard my first review since then I realized that I didn't have the usb cable pushed in far enough for a connection which stopped the item from charging and that's why it stopped working. Item works as described, clean cut, easy to use and really worth the cost. I definitely recommend.
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Reviewed in the United States on April 3, 2026
★★★★★ 5
Very Easy to Use, no stress on your hands
Color: Black
I am 76 and my hands don’t grip the way they used to. Too hard using a manual can opener. This one definitely fits the bill, plus I like the rechargeable feature!
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Reviewed in the United States on April 12, 2026
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