The customer in Holland Park thought the cat flap had reached the end of its life. It had stopped working, and the obvious battery holder on the left side had already drawn attention.
Our Kensington Maintenance Services Ltd handyman replaced the two type C 1.5V batteries on that side first. The unit still did nothing. At that point, many people would order a new flap and throw the old one away.
The detail that changed this job sat on the other side of the unit. The wall blocked the right-hand section, so the customer assumed no more batteries existed there. We removed the cat flap, found the second battery holder, replaced those batteries too, and restored power.
Why a Battery Cat Flap Can Look Dead When It Is Not
Many electronic and microchip-style cat flaps use more than one battery compartment. Manufacturers sometimes split the power supply across both sides of the body. That can catch people out when one side sits tight against a wall, door lining or reveal.
On this Holland Park job, the left-hand battery holder took two type C 1.5V batteries. The right-hand holder also needed two type C batteries. The customer could see one side clearly but not the other.
That matters because a partly changed battery set will not always bring the unit back to life. The flap may click, flash weakly, or do nothing at all. In this case, it stayed off until we replaced all four batteries.
Older London homes often make simple fittings less simple. Period walls, thick door linings, side returns and tight entrances can hide access points. A small product fault can then look like a failed unit.
Check the Visible Battery Compartment First
Start with the battery holder you can reach without moving the unit. Open the cover and check the battery type printed on the casing or label. Do not guess, as similar-sized batteries can give the wrong fit or voltage.
For this cat flap, the visible left-hand side used two type C 1.5V batteries. Our handyman fitted fresh batteries and checked the polarity marks. The plus and minus ends must match the diagram inside the holder.
After fitting batteries, close the cover firmly. Some flaps will not power up if the holder sits loose. Listen for a click or look for a small indicator light if the model has one.
Do Not Condemn the Unit Too Early
If the flap still fails, pause before you buy a replacement. A decent electronic cat flap can cost far more than a set of batteries. Replacement also brings fitting time, screw-hole issues and possible making good.
On this job, the customer wanted to dispose of the unit after the first battery change failed. We advised against that straight away. The casing design suggested another power point might sit out of sight.
This step saved the customer from an unnecessary replacement. It also kept the cats using their normal entry point. That matters when pets rely on a set route in and out of the property.
Remove the Cat Flap Carefully to Reach Hidden Sections
When a wall or frame blocks part of the cat flap, remove the unit carefully. Do not lever the plastic body with force. Most flaps use small screws that can strip or crack the casing if rushed.
Our technician removed the unit enough to inspect the right-hand side. That exposed the second battery holder. The customer had not seen it because the wall sat directly beside that section.
Keep the screws safe as you work. Use a small tray or magnetic dish if you have one. Cat flap screws often differ in length, especially when someone has adjusted the fitting in the past.
Replace Every Battery in the Set
Once you find a second holder, replace the full set of batteries. Do not mix old and new batteries. The weaker cells can drag down the new ones and cause unreliable operation.
We replaced the batteries in the right-hand section and rechecked the left-hand side. The unit then powered up correctly. The cat flap could once again let the cats enter and exit without the customer opening large doors.
Use good quality alkaline batteries unless the manufacturer states otherwise. Rechargeable batteries can run at a lower voltage. Some pet flaps behave badly when the voltage sits below the expected level.
Refit the Unit and Test It Before You Finish
After the batteries work, refit the cat flap squarely. Tighten the screws enough to hold the body firm, but do not crush the plastic. Over-tightening can twist the frame and make the flap stick.
Test the flap several times before putting tools away. Check that the lock releases, the flap swings cleanly, and the battery covers sit shut. If the unit uses a microchip reader, test it with the pet nearby if possible.
On this Holland Park repair, the key result came from a simple test. The unit regained power after the hidden batteries went in. That confirmed the cat flap itself had not failed.
Practical Costs, Timing and When to Call a Handyman
This type of cat flap repair often suits a handyman visit. Our handyman rate is £80 per hour plus VAT, which comes to £96 including VAT at 20%. The final time depends on access, fixings and the condition of the unit.
For a straightforward battery diagnosis and refit, many jobs fit within a short visit. If the flap needs replacement, the cost can rise. New electronic or microchip cat flaps commonly range from about £60 to £180 for the unit alone, depending on the model.
Fitting can take longer in thick doors, uPVC panels, timber doors or awkward wall positions. Holland Park and Kensington properties often have older joinery, deep reveals and altered back doors. Those details can slow down what looks like a five-minute job.
Check the manual if you have it. Search the model number on the casing if you do not. Many manufacturers show battery locations in diagrams, but hidden side compartments still catch people out.
Avoid forcing the flap if it sits inside a glazed door or panel. Glass, sealed units and some composite doors need specialist handling. If a cat flap connects to mains power or sits near electrical fittings, arrange a professional inspection before touching it.
Landlords should also think about access and tenant disruption. A failed cat flap can become a daily nuisance fast. A small repair may avoid a replacement, a missed delivery of parts and a second visit.
Frequently Asked Questions
Q1: Why did my cat flap stop working after I changed the batteries?
You may have changed only one battery compartment. Some units use batteries on both sides, and one holder can sit hidden by a wall, frame or door lining.
Q2: What batteries do electronic cat flaps usually use?
Many use AA, C or D batteries, but you must check the exact model. This Holland Park unit used two type C 1.5V batteries on the left and two more on the right.
Q3: Should I replace a cat flap that will not power on?
Not before you check all battery holders and the polarity. A hidden compartment or loose cover can make a working unit look dead.
Q4: How much does Kensington Maintenance Services charge for this type of handyman job?
Our handyman rate is £80 per hour plus VAT, which is £96 including VAT at 20%. Parts, specialist fixings or a replacement flap cost extra if needed.
Q5: Can I remove a cat flap myself to check for hidden batteries?
You can try if the flap sits in a simple timber door and you feel confident. Stop if the unit sits in glass, a tight wall opening, or near electrics, and call a professional.
The lesson from this Holland Park cat flap repair is simple: check the whole unit before you throw it away. Our handyman found the hidden right-hand battery holder, replaced the second pair of type C batteries and got the flap working again, so if your cat flap has stopped responding or you need a careful repair in Kensington, Chelsea or nearby, contact Kensington Maintenance Services Ltd at https://www.kensingtonmaintenance.co.uk/about-us/contact-us/ and we will take a proper look.