Same day despatch
Paypal friendly
Expert hotline +44 (0)2392 644588 logo

Battery Cut Off Switch, MX5 Mk1/2/2.5

SKU: SI4011

Here's a great idea!

Does your battery keep going flat when you haven't used your car for a while? Fed up with disconnecting your battery when you put your car away? Then we have the product for you. This great little switch can be fitted directly to the negative terminal of the battery, and with one easy twist it can be connected and disconnected in seconds.

It can also serve two purposes. If the supplied fused link is used, it acts as an immobiliser. Once the cut off switch is disconnected it will still continue to supply power through the link, unless the starter motor is operated, when the fuse will blow making it impossible to start the car. If used without the fused link, it will cut all power to the car, preserving the battery, and ensuring your car will start again when you want it to!

These fit perfectly to the Mk1, whilst the Mk2/2.5 will require a small piece of the cardboard battery cover to be removed so it will sit flush. It can not however be used on the Mk3, as the standard battery comes with the smaller post terminals. 


Based on 15 reviews

Joe Aird
After a week on the car it just clean snapped
04/06/2023 12:17:09
Ian Wilkinson
Useful piece of kit but the battery connection seems designed for a parallel battery post rather than the tapered one on my Mk2.5. Not sure of the connection so will put the 11mm spanners in the boot just in case.
03/12/2020 12:16:04
michael farrow
Fitted perfectly to my 1995 Eunos. Had this 10 months now and bought new Westco battery & Optimate charger all at same time. I only do short journeys and battery now always optimised. Best security device going as even I cannot see the wheel to cut power to starter motor, however as it's my car i know exactly where to put my hand in the boot to do on/off. With boot open it takes me 5 seconds to operate this.
19/12/2017 12:16:12
Adrian Harvey
I bought this item at the same time as buying a Westco battery and both items arrived a day later as usual.However when I came to fit the item, the clamp fitting of the switch did not fit the battery terminal as it was too small.As the item is machined from a solid piece of brass, there is little movement in the clamp and hence the clamp cannot be opened up to fit.I have therefore reluctantly asked for a refund as I cannot fit it. This is the reason for the very low rating.
25/06/2016 12:16:17
Alex Kloukinas
This is really a very nice product. The placement was made within 10 minutes and applied perfectly. There was no transformation in the car, and no wires are cut. The product is perfect for me, because I use the car a bit, and stay several days in the garage. So I do not need any more tools to connect and disconnect the battery and the cover is always in place in my MK 1.
17/06/2016 12:16:17
Thomas Klups
Extremely disappointed !!! I ordered this product with several other Parts. delivery was quick to France. BUT I am EXTREMELY disappointed Parts of this electric. The latter arrived home damaged / bent and cracked. Yet cardboard my order was no shock and this emballade Parts for electric battery was intact. yet the Parts is delivered already damaged (I have the evidence photos) Considering the price the cost of return ports, I'm not about to be references to gage if I MX5 shares for EIMBURSEMENT. MX5 may be able to share something?This means that there is a storage problem or manufacture of this product. I am extremely disappointed. so I lost € 14.96 ...
28/09/2015 12:16:19
Rich Wilson
Fitted to a mk2.5 in 5 mins. No need to modify anything, just unclamped the negative terminal and attached both points to this. Easy! Would recommend
04/02/2015 12:16:21
David McMichael
Fantastic piece of kit, easy to fit, no hassle. Usual excellent MX5parts service.
25/08/2014 12:16:23
Geoffrey Robins
This took a while to fit to my Mk2.5. I had to cut off negative earth battery fitting cap from the car's loom to allow the negative earth lead to bolt on to the cut off switch terminal or it would have looked like a right dog's breakfast. The earth lead now fits to the underside of the cut off switch and an added bonus was that I did not have to cut a hole in the hardboard battery cover as the on/off switch sits flush just under the cover. All in all, a bit of a work up to fit neatly, but a good bit of kit.
19/04/2013 12:16:29
Clayton McKie
Fantastic piece of kit, easy to fit and effective.......highly recommended if you lay your car up over the winter!
24/01/2013 12:16:30

Delivery Information - MX5 Parts

We understand that its really important for you to receive your goods in a timely fashion and for a competitive price. To ensure that we can deliver this we have developed a strategic partnership with both the Royal Mail and our courier partner, Think Worldwide.

At the present time, we only offer one delivery option ‘our carrier’. We will dispatch your goods with the most suitable carrier, for main land UK deliveries this is normally Royal Mail 1st class for packages weighing under 2kg and Think Worldwide for those that are over.

Our delivery charges are based on the weight of the consignment and the destination address. For UK mainland deliveries they start at £2.95 for a package weighing under 200g and rise to a MAXIMUM of £9.95 for a package weighing 2kg or over (EXCEPT very large bulky items that have an additional shipping surcharge added). The exact delivery cost will be clearly displayed at checkout.

Delivery times are estimated at 1-3 working days by Royal Mail, and 1-2 working days by Think Worldwide for mainland UK addresses. If you order before 3pm, Monday to Friday, we will dispatch the same day. If you order after 3pm, we will try to dispatch the same day, but if we cant it will be the next working day. Items ordered after 3pm Friday or over a weekend will be dispatched Monday. Items dispatched on Friday are for delivery the following week. Items ordered over a Bank Holiday will be dispatched the next working day. MX5parts is constantly updated to keep pace with changes in our stock but demand is high and we occasionally run out of popular items. If we have run out of stock and can’t dispatch your order the next working day, we’ll email or phone you with a revised dispatch date. You can then either accept the revised dispatch date or cancel the order, as you wish. Please note, shipping times are an estimate, and can not be guaranteed. Please note that during special offer periods, dispatch of your order may be delayed slightly due to high a volume of orders.

A signature is required for ALL orders delivered by Think Worldwide. Someone must be at your delivery address to sign for your parcel between 8am and 6pm on a working day. Please send it somewhere it can be reliably signed for, like your place of work, a neighbour, or perhaps your grans. We can (but we don’t like to) ask the courier to leave your parcel without a signature. If we do this, it will be YOUR responsibility if the parcel is lost or damaged. If you want it left, you need to give us your express instructions in the ‘additional information’ box at the end of the checkout process. It would be helpful if you could also indicate exactly where the package should be left.

If you need to change your delivery address, for any packages that have been dispatched with Think Worldwide, there will be an additional charge of £9.95 if the package has already been dispatched.

Please remember, even with Royal Mail deliveries, that any items which are too large to fit through your letter box will need someone to be available to receive the delivery. If the item cannot be delivered, you will be carded and given the option of either a re-delivery or you can collect your parcel from your local post office depot.

Orders sent to countries outside the UK will be sent VAT free, however please note that on all international shipments, the recipient is responsible for any local VAT, import duty and other clearance fees that may be charged.

For further information please email:

We NOW deliver to the following countries:

Baleares, Spain
British Virgin Islands
Burkina Faso
Canary Islands
Cayman Islands
Channel Islands
Costa Rica
Czech Republic
Dominican Republic
El Salvador
France (Mainland Only)
French Guiana
Hong Kong
Marshall Islands
New Caledonia
New Zealand
Papua New Guinea
Portugal (Mainland Only)
Puerto Rico
Saint Vincent And The Grenadines
San Marino
Saudi Arabia
South Africa
Spain (Mainland Only)
Sri Lanka
St Lucia
Syrian Arab Republic
Taiwan, Province of China
Trinidad And Tobago
United Arab Emirates
United Kingdom
United States

Our Guarantee - MX5 Parts

We guarantee that you’ll be satisfied with mx5parts!

We are an independant, family company, run by a dedicated team. We aim to be the kind of company that we’d like to deal with if we were you. You have our absolute commitment as fellow MX-5 owners, car nuts, internet users and hard-working people that you’ll be satisfied with mx5parts. If you’re not, let us know and we’ll sort it out!

We guarantee “always fair prices”

MX5parts maintains an everyday savings pricing policy. We watch other retailers closely and maintain competitive pricing. The internet being the beast it is means that any Tom, Dick or Henrietta can set up a website in their back room and charge bargain basement/off the back of a lorry (guv) prices. Often they will have no stock, no returns policy, questionable security, no guarantees and of course poor customer service. MX5parts strives to be open and honest, so we will never inflate our prices to set up an artificial ‘sale’ (a common – and illegal – retail practice).

It is inevitable in an open market like the internet that there will be some individuals selling some items cheaper than we do, and some selling them for more than we do, just as in the high street. We take great pride in offering a fast, efficient, friendly and secure shopping experience, with great products at fair prices. We encourage our customers to shop around, but are very pleased to welcome them back again and again.

We guarantee to despatch your order when we say we will

If you order before 3pm, Monday to Friday and we have your items in stock , we’ll despatch the same day . If you order after 3pm, we’ll still try to despatch that day but, if we can’t, we’ll despatch the following day. Items ordered after 3pm Friday or over a weekend will be despatched Monday. Items despatched on Friday are for delivery the following week. Items ordered over a Bank Holiday will be despatched the next working day. MX5parts is constantly updated to keep pace with changes in our stock but demand is high and we occasionally run out of popular items. If we have run out of stock and can’t despatch your order the next working day, we’ll email or phone you with a revised despatch date. You can then either accept the revised dispatch date or cancel the order, as you wish. Please note that during special offer periods, dispatch of your order may be delayed slightly due to high a volume of orders.

We guarantee to replace any goods which aren’t suitable

We guarantee to accept back any goods that you do not want, are not suitable, have changed your mind about, infact, for ANY reason, provided the goods reach us within 30 days of dispatch from us, in their original condition and packaging. Please tell us why you are returning the items, just for our records. The original purchase price of the goods will be refunded on to the card that was used for their purchase. Sorry, but we can not refund the carriage costs.

We guarantee to sort out any problem with your order

Just contact us if you have any problems with an order from mx5parts. We’ll tell you exactly what steps we’re going to take to rectify the problem.

We guarantee full warranty support on all items

Just contact us if you have a warranty problem. All goods supplied by mx5parts are from official sources and are covered by the normal manufacturers warranty.

We guarantee that we will only charge your credit/switch card when your goods are dispatched

This is your right under UK law and, if we do anything else, it’s illegal!

(Please note: This doesn’t apply however if you have chosen to pay via PayPal. Due to the way PayPal works, you are effectively sending the money to us rather than us asking for it so in this instance we will have received payment at the time the order was placed and not when it is ready for dispatch).

We guarantee that we won’t pass your email details on to anyone else

Absolutely not. All your details are treated as strictly confidential. We’re internet users, too, and we know how annoying unsolicited email can be. We wouldn’t risk annoying you by being the cause of it.

We guarantee that shopping with us is safe

Our website uses the very latest secure server hardware and software, and is certified secure by COMODOs hackerguardian facility ensuring we are continuously PCI DSS Compliant.

back to top