By LankaFix Tech Tips & Trends
– Because power cuts shouldn’t cut your peace of mind.
In Sri Lanka, where power cuts are still part of daily life in many areas, your inverter battery is more than a backup — it’s a lifeline for your fan, lights, router, and appliances.
But over time, even the best batteries lose strength, fail without warning, or become dangerously unstable.
This 2025 expert guide reveals the top warning signs your inverter battery is on its last legs — and exactly how to test it like a pro (or with a technician). Whether you’re using Exide, Amaron, Luminous, DCPower, or other brands, this guide applies to all.
🚨 Why You Shouldn’t Ignore a Weak Battery
A failing inverter battery isn’t just an inconvenience — it can:
- ⚠️ Leak dangerous acid
- 🧯 Cause overheating and fire hazards
- 🔌 Damage your connected appliances
- 💸 Waste electricity with inefficient charging
If your home relies on 24/7 uptime for work, kids’ study, security, or medical needs — you must know the early signs.
🔍 1. Top 10 Warning Signs Your Inverter Battery Needs Replacing
1. 🔋 Reduced Backup Time
Your inverter used to run 6–8 hours — now it barely lasts 30 minutes?
➡ Classic sign of battery degradation.
Internal plates wear out, reducing capacity.
2. 🔥 Battery Overheating During Charging
If your battery gets too hot to touch, especially near the terminals:
- Internal resistance is too high
- It may be nearing short-circuit stage
⚠️ Overheating is a fire hazard. Get it inspected immediately.
3. 💧 Acid Leak or White Crystals Near Terminals
Signs of:
- Sulphation (sulphate build-up)
- Acid spill
- Corroded terminals
🧪 This can permanently damage both battery and inverter.
4. 🔊 Beeping or Alarm Sounds from Inverter
Modern inverters beep frequently when:
- Voltage is too low
- Battery fails to hold charge
- Internal fault detected
👉 Don’t ignore the noise — it’s your system crying for help.
5. ⚡ Slow Charging or Not Charging at All
If your inverter:
- Takes unusually long to charge
- Stays in “charging” mode all day
- Doesn’t reach 100%
Then the battery may no longer accept or retain charge properly.
6. 🔌 Frequent Inverter Shutdowns or Tripping
- Inverter shuts off within minutes
- Fails to start when power goes out
- Trips when load is applied
🚫 This isn’t an inverter problem — it’s often a battery fault.
7. 🌡️ Swollen Battery Casing
Physical bloating = internal gas pressure.
Very dangerous and often irreversible.
⚠️ Risk of explosion or acid leak. Replace immediately.
8. 🔋 Battery Age Over 3 Years (for Lead Acid Types)
Most inverter batteries in Sri Lanka last:
- Lead-Acid: 2–3 years
- Tubular: 3–5 years
- Lithium-ion: 5–8 years (premium only)
If you’ve crossed the threshold — degradation has already begun.
9. 🔄 Inverter Stuck in Float Mode
If your inverter stays in “float charge” or blinks without progressing, it means:
- The battery is fully charged too quickly
- Or it’s unable to enter proper bulk/absorption stages
💡 Bad sign of internal wear.
10. ⚙️ Rusted or Damaged Terminals & Connectors
Loose, rusty, or melted battery wires = poor connectivity & unsafe operation.
👨🔧 LankaFix Tip: Clean terminals monthly with hot water + baking soda.
🧪 2. How to Test Your Inverter Battery (At Home or With a Technician)
🔋 Method 1: Load Test (Manual)
What You Need:
- Basic voltmeter or multimeter
- 100W or 200W appliance (fan, CFL light, etc.)
Steps:
- Fully charge the battery
- Disconnect main power and switch to inverter
- Monitor how long it powers your appliances
- Use voltmeter to check voltage drop
📉 If it drops below 10.5V quickly, the battery is weak.
🧪 Method 2: Battery Gravity Test (For Lead-Acid)
What You Need: Hydrometer
Measures specific gravity of electrolyte in each cell.
Readings:
- 1.265 = Fully charged
- 1.120 = Needs replacement
- Big variation between cells = cell imbalance
📌 Only for open lead-acid batteries (not sealed or lithium).
🔌 Method 3: Digital Battery Analyzer (By LankaFix Technicians)
Our smart testers check:
- Internal resistance
- Voltage drop under load
- Charging curve accuracy
- Capacity benchmarking
📲 Book a technician at www.lankafix.com/technical-visit
🧰 On-site diagnostics within 30 minutes!
🛒 3. Recommended Battery Replacement Options (2025)
| Brand | Type | Capacity | Warranty | Price Range (LKR) |
| Exide | Tubular | 150Ah | 36M | 48,000–55,000 |
| Amaron | Tubular | 150Ah | 48M | 52,000–59,000 |
| Luminous | Tall Tubular | 180Ah | 48M | 58,000–65,000 |
| DCPower | Flat Plate | 120Ah | 24M | 39,000–44,000 |
✅ All available on LankaFix with genuine warranty & on-site installation.
💡 Pro Tips to Make Your Battery Last Longer
- 🔌 Don’t overload your inverter
- 🔋 Never let battery fully discharge
- 🌡️ Install in a cool, well-ventilated area
- 💧 Maintain proper electrolyte levels (for non-sealed)
- ✅ Use genuine inverter-compatible batteries
- ⚠️ Clean terminals every 1–2 months
- 🔌 Disconnect from inverter if not in use for weeks
🧯 Battery Safety Tips for Sri Lankan Homes
- Keep battery away from kids & pets
- Never cover battery with clothes or plastic
- Don’t place near cooking gas, stove, or direct sunlight
- Always install on a wooden base or battery trolley
🎯 Final Verdict
Your inverter is only as good as your battery.
A weak battery won’t just fail you during a power cut — it can put your devices, data, and safety at risk.
Stay proactive. Know the signs. Test regularly. Replace before it’s too late.
🛠️ Need Help? Call LankaFix Battery Experts
- 🔋 On-site battery testing within 48 hrs
- 🧰 Genuine battery replacement & recycling
- 🚚 Delivery & installation across Western Province
📞 071 988 8848 | 🌐 www.lankafix.com
📚 Sources & References
- Exide Sri Lanka
- Luminous Power Technologies
- Amaron Battery Guide
- Battery University – Battery Aging & Testing
- LankaFix Technical Field Data (2023–2025)
