DR Trimmer Replacement Battery: Mighty Max ML2.3-12
The Mighty Max ML2.3-12 is a 12V 2.3Ah rechargeable SLA AGM battery with F1 terminals. It matches the voltage and capacity DR lists for its own replacement battery for electric-start DR Trimmer Mowers, but the published sizes differ. Check the fit before you order.
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Will This Battery Work in a DR Trimmer?
DR lists its own 12V 2.3Ah replacement battery for DR Trimmer Mower and SPRINT models purchased after 2001. Machines bought before 2001 use a different DR battery. DR PULSE 62V products use a different battery type. Run this quick check before you buy.
DR’s own replacement battery (#247491) is listed at 7¼ × 1½ × 2⅜ in. The ML2.3-12 is listed at 7.00 × 1.38 × 2.50 in. Voltage and capacity match, but fit on your machine is not confirmed. Compare your old battery and tray first. If you are unsure, contact DR with your model details.
Mighty Max ML2.3-12 Specifications
| Property | Detail |
|---|---|
| Brand / model | Mighty Max Battery ML2.3-12 |
| Chemistry | Sealed lead-acid (SLA), absorbed glass mat (AGM) |
| Nominal voltage | 12 V |
| Rated capacity | 2.3 Ah |
| Rechargeable | Yes |
| Terminal type | F1 |
| Dimensions (as published) | 7.00 × 1.38 × 2.50 in |
| Weight (as published) | 2.10 lb |
| Design | Valve-regulated AGM, calcium-alloy grid, no maintenance needed |
| Duty | Float and cyclic applications |
| Warranty | 1 year (advertised) |
| Pack options | 1, 2, 4, 6 and 10 batteries |
| DR reference battery | DR #247491: 12V 2.3Ah, 7¼ × 1½ × 2⅜ in |
| Not published | Charge limits, discharge and starting current, cranking amps, temperature limits, cycle life |
Specifications come from the Mighty Max product page and DR Power’s replacement battery page. Mighty Max does not state whether the 2.50 in height includes the terminals. Check the label on your battery before you order.
DR Trimmer Battery Replacement Difficulty
This is a moderate job. The battery is light at 2.10 lb, and DR documents a push-on negative battery connector on its electric-start models. The harder part is confirming that the battery fits your tray, clamp and connectors. Tap a slice to highlight it.
- 20% Removing & securing the battery
- 25% Connectors & polarity
- 40% Confirming the fit
- 15% Testing start & charging
The difficulty score and effort split are an editorial estimate. No official rating or install time exists for this battery in a DR trimmer.
How to Replace Your DR Trimmer Battery
These are general steps for an electric-start DR Trimmer/Mower. Access and hold-down hardware differ by model. Check your manual too. Tap each step to tick it off as you go.
- 1Shut down the machineStop the engine with its shutoff control. On many models the key does not stop it. Remove the key and wait five minutes. Then disconnect the spark plug wire and keep it away from the plug.
- 2Disconnect the old batteryNote where each cable goes. Disconnect the black negative cable first, then the red positive cable.
- 3Remove the old batteryRelease the hold-down and lift the battery out. Keep the clamp and hardware if they are in good shape.
- 4Compare the new batteryCheck the size, height clearance, terminal fit, polarity and cable reach before you install it.
- 5Install and reconnectSecure the battery in its tray. Connect the red positive cable first, then the black negative cable. Make sure both connectors sit firmly.
- 6Test and recycleReconnect the spark plug wire and test electric starting. Do not crank for more than 10 seconds at a time. Take the old battery to a lead-acid battery recycling point.
A weak battery is not the only cause. DR also advises checking the battery charge, fuses, battery connections, engine ground, solenoid wiring and solenoid ground.
Where This Battery Fits
Mighty Max lists general uses for its SLA battery range, but gives no tested device list for the ML2.3-12. Always match the battery to your device manual first.
- DR Trimmer MowerElectric-start, bought after 2001
- SPRINT DR Trimmer MowerElectric-start, bought after 2001
- Pre-2001 DR trimmersDR names a different battery
- DR PULSE 62VUses a different battery type
- Manual-start modelsDR covers the battery for electric-start only
- Engine startersListed for Mighty Max SLA range
- Lawn & garden toolsListed for Mighty Max SLA range
- Emergency lightingListed for Mighty Max SLA range
- Security systemsListed for Mighty Max SLA range
- Access controlListed for Mighty Max SLA range
- Solar applicationsListed for Mighty Max SLA range
- Toys & hobby gearListed for Mighty Max SLA range
Charging, Storage & Disposal
DR says its 6.75 and 7.25 EXi engines have no alternator. Running the engine does not recharge the battery on those models. Charging needs differ by model. Check your manual and the battery label before you pick a charger.
- DR says never to alter standard machine parts. Do not force the clamp or bend terminals to fit the battery.
- Never charge or use a battery that is cracked, leaking or damaged.
- Charge after each use if your model does not charge while running.
- DR advises recharging every four to six weeks during long storage.
- Recycle the old battery. Do not put it in household trash.
Mighty Max ML2.3-12 for DR Trimmers: FAQ
Is the Mighty Max ML2.3-12 a confirmed replacement for the DR battery?
Not confirmed. It matches the 12V 2.3Ah rating of DR’s replacement battery, but the published dimensions differ. Check fit, connectors and polarity on your machine before you rely on it.
Does it fit every DR trimmer?
No universal fit is established. DR lists its 12V 2.3Ah battery for DR Trimmer Mower and SPRINT models purchased after 2001 and names a different battery for older machines. DR PULSE 62V products use a different battery type.
Is the ML2.3-12 rechargeable?
Yes. It is a rechargeable, sealed lead-acid AGM battery. Check the battery label and your machine manual before choosing a charger.
Does the DR engine recharge the battery while it runs?
It depends on the model. DR says its 6.75 and 7.25 EXi engines have no alternator and do not recharge the battery while running.
How long will the ML2.3-12 last?
No model-specific service-life figure is published. Mighty Max advertises a one-year warranty, which is not a lifespan estimate.
How should I dispose of the old battery?
Recycle it through a lead-acid battery recycling route. Do not throw it in household trash.