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The Discover D12550-F11M6 is a 12V 58Ah AGM battery for compatible standby and general-purpose equipment, including security systems and emergency lighting. Its sealed design needs no routine water top-ups. Order your replacement from DIYBattery and match the voltage, dimensions and terminal connections to your existing battery.
| Chemistry | Sealed lead-acid, AGM / VRLA |
|---|---|
| Voltage | 12V |
| Capacity (20-hour rate) | 58Ah |
| Capacity (10-hour rate) | 55.0Ah |
| Case size (L × W × H) | 229 × 138 × 208 mm |
| Approximate weight | 16.70 kg |
| Terminals | F11M6 |
Capacity depends on load and temperature. Confirm voltage, dimensions, terminal type and polarity before ordering. Dimensions and weight above follow the supplied model specifications; allow for terminal clearance and confirm the full installed height. Use a charger suitable for a 12V AGM battery and follow Discover’s charging recommendations.
Compare your existing battery model with this Discover battery. A model number or Ah rating alone does not confirm compatibility.
D12550-F11M6: 12V · 58Ah · F11M6 · 229 × 138 × 208 mm
Before ordering, match voltage, case size, total installed height, terminal width or bolt size, polarity, charger and discharge duty. F1 is 4.8 mm; F2 is 6.3 mm. Standby, deep-cycle, high-rate, GEL and lithium batteries are not interchangeable based on Ah alone.
| Existing battery | Required check |
|---|---|
| AJC D55S NB | 58Ah upgrade from 55Ah. AJC NB and Discover M6 insert differ. Check cable reach and polarity. |
| UPG UB12550 I4 | 58Ah upgrade. Confirm M6 thread and polarity, especially reversed-terminal versions. |
| Power-Sonic PS-12550 M6 | 58Ah versus 56.6Ah on current Power-Sonic sheet. Check total height and polarity. |
Ask DIYBattery to check your battery
Reference reviewed: 2026-10-31
Coverage depends on your battery model and the terms supplied with your purchase. Contact DIYBattery before returning, shipping or dropping off a battery.
Read the warranty terms or compare warranty support options. Standard manufacturer replacements require warranty approval. The optional DIYBattery Premium one-time exchange does not require testing or manufacturer approval before delivery; see its separate terms.
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