Energizer Sealed Lead Acid (SLA) Batteries

Energizer SLA batteries are valve‑regulated, non‑spillable lead‑acid batteries designed for reliable backup and moderate cyclic use. Typical applications include UPS systems, alarm and access panels, emergency lighting, mobility devices, and small renewable or telecom backups.

When to choose an Energizer SLA

• Use for dependable standby power with minimal maintenance.
• Choose for indoor installations where a sealed, spill‑resistant design is preferred.
• Good fit for moderate discharge rates and occasional cycling (e.g., mobility or lighting).
• Avoid for high‑surge cranking, very deep daily cycling, or tight weight constraints—consider LiFePO4 for lighter weight and longer cycle life.

Key specs and options

Attribute	Typical Details
Chemistry	Valve‑regulated lead‑acid (VRLA), AGM
Nominal voltage	6 V or 12 V
Capacity (20‑hr rate)	~1.3 Ah to 35 Ah+ (model dependent)
Orientation	Non‑spillable; mount upright or on side (check model for inverted use)
Terminals	Faston F1 (0.187 in) or F2 (0.250 in); larger models may use screw posts
Storage/standby life	Typically 3–5 years at 77°F (25°C) with proper float charging
Operating temps (typ.)	Discharge −4 to 122°F (−20 to 50°C); charge 32 to 104°F (0 to 40°C)

How to choose the right model

1. Match voltage first (6 V or 12 V).
2. Select capacity (Ah) to meet runtime needs; higher Ah = longer runtime and larger size.
3. Confirm physical size and terminal type (F1 vs F2 or screw) to fit your device/cables.
4. Check charger compatibility (SLA/AGM profile, correct float/absorption voltages).
5. For series or parallel banks, use identical models and ages; pre‑charge to the same voltage.

Runtime basics

Approximate runtime (hours) = Usable Ah ÷ Load (A). Usable Ah is often 50–80% of rated Ah to protect battery life and account for rate/temperature losses. For AC loads via an inverter, multiply by ~0.7 to account for conversion losses.

Example	Load	Battery	Estimated Runtime
Emergency LED lighting (12 V DC)	20 W ≈ 1.7 A @12 V	12 V 7 Ah	~2.0–3.0 hours (50–80% usable)
Home internet gear (router + ONT)	18 W via inverter	12 V 12 Ah	~2.5–3.5 hours (includes inverter losses)

Note: Actual runtime varies with discharge rate, temperature, battery age, and cutoff voltage.

Charging and installation

• Use an SLA/AGM charger. Typical float: 2.25–2.30 V/cell (13.5–13.8 V for 12 V). Typical cyclic/absorption: 2.40–2.45 V/cell (14.4–14.7 V for 12 V). Always confirm your model’s datasheet.
• Temperature compensation (recommended): about −3 mV/°C/cell from 25°C (77°F).
• Fuse the positive lead near the battery (within 6–12 in) to protect wiring.
• Tighten terminals securely but avoid over‑torque; keep connections clean and corrosion‑free.
• For storage, fully charge, then recharge every ~3 months at 68–77°F (20–25°C). Cooler storage slows self‑discharge.

Safety and handling

• Provide ventilation; VRLA batteries can vent gas if overcharged or stressed—do not use in sealed enclosures.
• Avoid deep discharges (below ~10.5 V for a 12 V battery) to extend life.
• Do not mix old and new batteries in the same string. Recycle at end of life through approved programs.

Alternatives

• Gel VRLA: better tolerance to deep cycling and heat; slower charging and lower peak current.
• LiFePO4: much lighter, higher cycle life; requires a compatible charger/BMS and may not be drop‑in for every system.

Compatibility notes

• UPS replacements often use 12 V 7–9 Ah sizes; verify dimensions and F1 vs F2 terminals.
• Series (to increase voltage) and parallel (to increase capacity) are acceptable with identical, equally aged batteries charged to the same voltage before connection.
• Not designed for engine starting or high surge cranking.

FAQ

How long will an Energizer SLA last?

In standby with proper float charging at 77°F (25°C), expect about 3–5 years. In cyclic use, 200–400 cycles at ~50% depth of discharge is typical. Heat and deep discharges shorten life.

Can I mount the battery on its side?

Yes. SLA/AGM batteries are non‑spillable and can be mounted upright or on their sides. Avoid inverted mounting unless the datasheet explicitly allows it.

What charger should I use?

Use a charger with an SLA/AGM profile and correct voltages (e.g., ~13.5–13.8 V float for a 12 V model). Avoid “desulfation” modes that exceed recommended voltages.

Can I replace a 12 V 9 Ah with a 12 V 7 Ah?

Yes if it fits and the terminal type matches, but runtime will be shorter. Never substitute a different voltage.

How does temperature affect performance?

Capacity drops in cold conditions (e.g., around 32°F / 0°C you may see a 20–30% reduction). High temperatures accelerate aging; keep around 68–77°F (20–25°C) for best life.