Milenco OptiMate 20 – 12V Smart Battery Charger, Maintainer & Power Supply
14-day returns on all eligible orders
Contact us within 14 days of receiving your order to request a return.
Shipping information
Orders are picked, packed and dispatched from our Northampton warehouse.
- Free delivery to mainland UK addresses on orders of £40 or more.
- Orders under £40, and orders to Northern Ireland, have a delivery charge, shown at checkout before you pay.
- You will get an email with your tracking number once your order has shipped.
Full details are in our Shipping Policy.
Returns & warranty
Changed your mind? You can return an online order within 14 days of receiving it. Please contact us first for return instructions, then you have 14 days to send the goods back.
- Items must be unused, complete and in their original condition, with all accessories, instructions and original packaging.
- You arrange and pay for the return postage on change-of-mind returns. We refund the price of the item plus our standard delivery charge.
- Damaged in transit? Let us know within 48 hours of delivery - photos help.
- Faulty or wrong item? Contact us before sending anything back. Faulty goods are covered by your statutory rights.
Your statutory rights are not affected. Full details are in our Refund Policy, or email onlinesales@nn4online.co.uk.
Professional-grade care for big leisure batteries. Milenco OptiMate 20 is a high-output 12V smart charger that automatically tests, saves, charges and maintains lead-acid batteries (flooded, AGM, gel, EFB). It can also act as a stable power supply for diagnostics or memory-safe work. OptiMate’s program analyses the battery first, applies recovery/desulfation if needed, then charges efficiently and switches to safe long-term maintenance you can leave connected for storage. Spark-safe with reverse-polarity and short-circuit protection, and supplied with quick-connect leads for easy hook-up in motorhomes, caravans, vans, cars and boats.
Why choose OptiMate 20
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Automatic multi-stage program: test, recover/desulfate, charge, maintain
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Power-supply mode for diagnostics or voltage support during ECU memory swaps
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Ampmatic current control adjusts to battery size and condition
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Safe to leave connected long-term; will not overcharge
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Spark-safe, reverse-polarity and short-circuit protected
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Clear status LEDs show charging progress and battery checks
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Robust casing for workshop or touring use
What’s included
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OptiMate 20 charger unit
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Crocodile clamp lead (quick connect)
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Fused ring-terminal lead for permanent fitment
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Mains lead and user guide
Use notes
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For the easiest upkeep, fit the ring-terminal lead to the battery; plug in the charger when parked.
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Match polarity (red = +, black = -) and keep the unit ventilated during charging.
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For long storage periods, you can leave connected; the charger will maintain safely and periodically test the battery.