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Century D23LT MF 65Ah 12V deep cycle flooded battery, maintenance-free with standard tapered post terminals, made in AustraliaBattery top-view polarity diagram for a six-cell 12 volt battery with positive terminal location marked – Century batteryLine drawing of a standard tapered lead battery post, labelled Standard Terminal Post (STD) – Century battery

Century

D23LT MF Deep Cycle Flooded Battery — 65Ah 12V Made in Australia

145108

Century D23LT MF deep-cycle flooded battery. 65Ah 12V, maintenance-free, standard terminal posts, made in Australia. For caravans, campers, marine house banks and 4WD auxiliary circuits.

$265.00

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Caravans, camper trailers and motorhomes as house or auxiliary battery

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A flooded deep-cycle battery sized for caravans, camper trailers, 4WD house circuits and smaller marine house banks that need steady energy over hours. Delivers 65Ah of usable capacity in a 230 × 171 × 200mm case that drops into standard D23-pattern battery trays and compact auxiliary boxes.

Built in Century's Villawood, NSW plant with full-frame cast plates and Platelock internal bracing that resists the shaking that cracks flooded plates in off-road use. Standard tapered-post terminals (C polarity, positive on the right) take OEM clamps straight on. The case is sealed maintenance-free, with central venting for safe hydrogen release.

Charges from a dual-battery isolator, DC-DC charger or 240V smart charger set to flooded profile. Keep it off the alternator mains — use a DC-DC between cranking and house batteries, or the flooded cells sulphate at high alternator voltages.

  • 65Ah deep cycle — steady discharge over hours for house loads
  • Full-frame cast plates — stiffer internal structure resists vibration damage
  • Platelock bracing — reduces plate movement in off-road use
  • Standard tapered post — fits common OEM clamps and ring lugs
  • Maintenance-free — sealed caps, no electrolyte top-ups required
  • Central venting — routes hydrogen outside the compartment for safe install
  • Made in Australia — built at Century's Villawood NSW plant for AU conditions

Electrical

Voltage: 12V

Capacity: 65Ah (20hr)

Chemistry

Type: Deep Cycle Flooded

Technology: Maintenance-Free Lead Acid

Physical

Dimensions: 230 × 171 × 200 mm (L×W×H)

Weight: 17.1kg

Terminal: Standard post, C polarity

Length230mm
Width171mm
Height200mm
Weight17.1kg

Fits a standard D23 battery tray. Measure the tray before buying: 230 × 171mm footprint, 200mm tall to the terminal top.

Mount upright. Flooded cells rely on gravity to keep electrolyte level across the plates and will weep out of the vent cap if tipped past 20°.

Vent the compartment. Flooded batteries release small amounts of hydrogen when charging; keep a vented space or route the central vent outside the cabin.

For auxiliary use, charge through a DC-DC between the cranking battery and this house battery. Direct alternator charging drives this flooded chemistry at 14.4V+ for long runs and shortens its life.

Confirm polarity before connecting: positive on the right when viewed from the terminal face (C polarity). Clean posts and apply petroleum jelly to resist corrosion.

Caravans, camper trailers and motorhomes as house or auxiliary battery
4WDs and dual-cab utes with dual-battery house circuit
Boats and tinnies as marine house bank
Mobility scooters, golf carts and electric trolleys
D23 case trays and OEM auxiliary mounts (230 × 171 × 200mm)
Starting batteries — not CCA-rated for engine cranking
Direct alternator connection — pair with a DC-DC charger

Q: What does deep cycle actually mean?
A: A battery built to be drained to 50% (or deeper) and recharged, over hundreds of cycles. Starting batteries deliver short bursts of high current and die if you deep-discharge them. Deep cycle batteries have thicker plates and more active material to survive repeated draw-downs. Different jobs, different internal construction.

Q: What does Ah actually mean?
A: Amp-hours. How much energy the battery stores. 65Ah at the 20-hour rate means it delivers 3.25A for 20 hours. Draw harder and you get fewer total Ah out (Peukert's effect). For planning: a 60W fridge pulling 5A runs about 6-7 hours before you hit the recommended 50% discharge point.

Q: What's the difference between flooded and AGM?
A: Flooded (this battery) holds liquid acid in six cells, is cheaper per Ah, and needs to mount upright with venting. AGM holds acid in a glass-mat matrix, is spill-proof and tilt-tolerant, costs more per Ah, and typically has shorter deep-cycle life than quality flooded. Flooded wins on $/Ah in a fixed, vented install.

Q: What does maintenance-free actually mean on a flooded battery?
A: Sealed caps you can't open to top up electrolyte. Lead-calcium plate chemistry reduces water loss during charging, so the battery doesn't need refilling across its service life. The cells still vent hydrogen under heavy charge, so you still need an open or vented install.

Q: Can I use it to start my engine?
A: No. Deep cycle plates deliver sustained lower current, not the 300-800A burst a starter motor needs. Running it as a starter will blow the plates in a handful of starts. Pair it with a dedicated cranking battery and a DC-DC charger if your rig needs both.

Q: Why do I need a DC-DC charger instead of the alternator direct?
A: Modern alternators hold 13.8-14.4V, which is a flooded battery's maintenance float voltage — not a bulk-charge voltage. The battery charges to 70-80% and sits there. A DC-DC runs a proper three-stage charge so you actually hit 100%, and prevents the alternator cooking the flooded cells on long touring runs.

Q: How does the D23LT compare to the N70TX?
A: Both are Century maintenance-free deep cycle flooded. The N70TX carries 95Ah in a 302 × 170 × 200mm case with multi-terminal posts and carry handles for larger house loads. The D23LT carries 65Ah in a smaller 230 × 171 × 200mm case with standard posts — the fit when you need deep cycle in an auxiliary tray that won't take the N70 footprint.

Q: How often should I recharge it?
A: Target no deeper than 50% state of charge for best cycle life. In practice: recharge every time it's drawn to 12.0V resting (about 50% SOC) and never leave it discharged — sulphation sets in within days and takes capacity you can't get back.

Q: What's the warranty?
A: 12 months against manufacturing defects, from the date of purchase. Covers plate failures, case cracks and premature capacity loss. Damage from under-charging, sulphation after prolonged discharge, over-rating or alternator-direct charging isn't covered.

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