Dry cells
On flooded/tubular banks, electrolyte that is not topped up exposes the plates — permanent, irreversible damage.
Battery care & maintenance
Most battery banks die years too early. Yours doesn’t have to.
A lead-acid bank is only as good as its upkeep. A little routine care — or a proper maintenance contract — routinely adds years of reliable backup and defers a costly replacement.
Why banks die early
Four causes account for nearly every early failure.
Wrong charging
A charger set too high boils the battery dry; too low leaves it chronically undercharged. Both shorten life fast.
Bad terminals
Loose or corroded terminals add resistance, heat, and voltage drop — and can fail exactly when you need backup.
Heat
Every few degrees above room temperature roughly halves lead-acid life. A hot, unventilated cupboard is a battery killer.
Owner’s monthly checklist
Ten minutes a month you can do yourself.
No tools beyond a cloth and, for flooded banks, distilled water. If anything here looks off, call us before it becomes a dead bank.
Look for bulging or leaks
A swollen case or any wetness means stop and call — do not keep using it.
Check the terminals
Clean off any white/blue powder; make sure every connection is snug.
Feel for heat
Warm during charging is normal; hot to the touch at rest is not.
Top up water (flooded/tubular only)
Use distilled water to the marked level — never on sealed SMF.
Note the runtime
If backup time is dropping month on month, the bank is ageing — plan ahead.
What professional maintenance covers
Beyond what an owner can check.
The instrument-level work that actually predicts and prevents failure — done on a schedule, on record.
Per-cell voltage & health
We measure each unit under load to find the weak one before it drags down the whole string.
Charger & voltage audit
We verify the charging profile is right for your battery type — the fix that quietly saves the most banks.
Load & runtime test
A real discharge test tells you the true backup you have left, not the number on the label.
Annual maintenance contract
We also take over the health and maintenance of existing battery banks — including ones we didn’t install.
Inherited a bank with no service history? Put it on a Propel AMC. We assess its current health, tell you honestly what’s left in it, and keep it running — no obligation to have bought from us.
Quick self-check
Check what your bank should still deliver.
If backup time is slipping, this shows how far. A big gap usually means it’s time for a professional health check — often before a full replacement is due.
Open the full tool ›Step 1 · your load
Ceiling fan W each
LED light W each
Computer / TV W each
RefrigeratorMOTOR W · motor
FreezerMOTOR W · motor
Air conditionerMOTOR W · ≈1-ton 1200W · 1.5-ton 1800W · 2-ton 2400W
Water pumpMOTOR W · ≈0.5 HP 450W · 1 HP 900W
CCTV camera W each
Printer W each
Custom appliance W each
Your battery bank
Voltage & Ah are printed on the battery label — e.g. “12V 150Ah”. Add up the voltage across the series string for system voltage; count the batteries.
No. of batteries
Inverter kVA
The kVA rating on your inverter/UPS (e.g. “2.5 kVA”) — usually on the front label or box. Optional, but lets us check it can actually carry your load.
A healthy bank should give
—hrs
Indicative range · ±15%
Load—
Usable energy—
Depth of discharge—
At high continuous draw (a motor or AC), lead-acid loses usable capacity fast — this figure already derates ~25%. Lithium (LFP) holds its rating ›
Assumes your inverter can comfortably carry this load.
Capacity check
Your inverter can’t carry this load.
Step 2 · the honest check
How many hours do you actually get today?
Move the slider once you know your actual backup time.
WhatsApp me this resultCommon questions
Battery care, answered.
Do you maintain banks you didn’t supply?+
Yes. We take over the health and maintenance of existing banks, including ones we did not install. We assess current condition first and tell you honestly what is left in it.
How often should a bank be serviced?+
A quick owner check monthly, and a professional check a couple of times a year for most business banks — more often for large or hard-cycled installations.
Can you revive a bank that has lost backup time?+
Sometimes. If the cause is bad charging, loose terminals, or light sulphation, real capacity can sometimes be recovered. If the plates are damaged or dried out, we will tell you rather than sell false hope.
Is topping up with tap water okay?+
No. Tap water minerals damage the plates. Use distilled water only, and only on flooded/tubular batteries. Sealed SMF must never be opened.
What does an AMC actually include?+
Scheduled professional checks: per-cell health, charger/voltage audit, terminal servicing, a load test, and a record of the bank’s condition over time.
Buying a new bank instead of nursing the old one? See the buying guide & get a quote ›