bbl batteries

Marine Batteries - Making an informed choice…

Marine Batteries - Making an informed choice…

All boats have a need for electricity onboard and a good working battery is of great importance, not only for running your equipment, but also from a safety perspective.

It is a simple fact that all batteries degrade over time They are a finite commodity, therefore all batteries will need replacing at some point. When that time comes, it is important you choose the right battery for your requirement. However, how do you know which the right battery is, as every boat will have a different requirement depending on many different factors.

It can be very difficult to decide as the choices are plentiful. Technology, Reserve Power, Cranking Output, Voltage, Weight, Size, etc. The first consideration should always be based on what the battery is expected to power. Will the battery be required solely for starting the engine, will it need to run key instruments, or is there a host power hungry of equipment in the cabin that needs to be powered such as a fridge, microwave, etc.? Maybe all three?

Marine Batteries basically fall into three categories from a performance-based perspective:

  • Cranking Battery
  • Deep Cycle Battery
  • Dual Purpose Battery

Other important considerations when purchasing a new battery should be:

  • Battery Capacity – Reserve Power (Ah rating)
  • Battery Dimensions, i.e. the battery’s physical size (make sure the battery fits where it is supposed to)
  • Weight (does the battery need to be handled / moved regularly)
  • Output (marine cranking amp rating, reserve capacity rating, cold cranking amp rating)
  • Technology (flooded lead acid, gel, AGM, lithium-iron)
  • Warranty

*Always check your owner’s manual for the recommended battery types and ratings. Always choose along with the rating equal to or greater than the recommended value.

Cranking or Starting Batteries

These types of batteries offer high bursts of power for short periods of time to start your engine. Starting batteries are designed to put out a large amount of current for a short period of time. A cranking battery usually has a higher number of lead plates that are thinner and sometimes purer lead, with more surface area to provide the off the mark power.

Deep Cycle Marine Batteries

If you are looking to power both onboard electronics and accessories a deep cycle battery would be what you need. A deep cycle battery puts out less energy density for a longer period of time. It is designed to produce discharge cycles while the engine is off and therefore not being charged. A deep cycle battery generally consists of fewer lead plates that are thicker and more robust to provide continuous power output over long periods of time.

Dual Purpose Marine Batteries Batteries

Dual purpose batteries are designed to both start the engine and to power any equipment / electronics.

When purchasing a new battery, don’t forget to recycle your old one. Lead acid and Lithium Iron batteries can be safely completely recycled when done properly in the right facilities.

A Battery Monitor is highly recommended

Marine batteries have a pretty tough time of it including conditions out at sea, seasonal / occasional use and long hours without being recharged. BBL Batteries always recommends it is worth investing in a battery monitor. A huge number of marine batteries are either massively under-charged or massively over-charged which will certainly end their life prematurely. If you opted for a LIFOS, Lithium Iron battery then you would have the benefit of a built-in communication system that talked to your smart device (smart phone, tablet etc.) via a bluetooth app which would constantly provide you with the key performance indicators of the battery such as state of charge, power output / input etc.

BBL, The Marine Battery Experts

Choosing the right battery for your requirements, following a simple maintenance routine and monitoring your marine battery on a regular basis will ensure your battery remains healthy for a longer period of time ensuring your onboard equipment performs as it should making your marine activity both pleasurable, hassle free and most importantly safe. At BBL, our battery experts will offer you the very best advice based on nearly 50 years’ experience, a full range of marine batteries covering all options and the world’s leading brands of marine batteries such as Lifos, AVON and Yuasa.


Bristol - 0117 955 0535 -

Exeter - 01392 254 418 -

Plymouth - 01752 338 501 -

Swindon - 01793 616 646 -

Truro - 01872 270 011 -

Local Deliveries by VAN

Next Day Deliveries by Courier


Tina 07 January, 2020 Reply

Amazing help and service from the Swindon Branch this morning after my car wouldn’t start and taking a recommendation to bring it to BBL. Matt and the team were really friendly, helpful and efficient from my initial phone call to fitting, which was done immediately!  I am very thankful and will certainly be recommending this place to everyone. Thanks again highly recommended!


Gerald Lawrence 21 December, 2019 Reply

DONT GO ANYWHERE ELSE.BBLbatteries recommended by Breakdown chap saying batteries cheaper than anywhere else so went along.
yup batteries cheaper than elsewhere by £20 including fitting!!!!

Great service from the staff including walking out with a mug torch and a smile!!


Kerry 07 December, 2019 Reply

I have to leave a great review here.  on approach Matt that worked behind the counter was amazing he just seems to have a customer approach that would make u want to come back. I’m sure I won’t need to. But he’s an absolute asset to the business. Thanks for your help. Kerry.


George Paterson 06 December, 2019 Reply

Visited the Truro Branch today and was most impressed by the two lads behind the counter. I am somewhat deaf and cannot see particularly well and explained the problem I had with a small compact tractor battery which had limited space in the engine compartment. They talked me through the size and capacity I needed and even helped unload the old battery from my friends car and found a replacement model in the store which should do the trick they said. Upon reaching my home the new battery did the trick - fitted into the compartment perfectly and I am a very happy ole boy. Thank them very much please for their patience and guidance. Very much appreciated.


Jacek Pelc 06 December, 2019 Reply

Top service. Guys were really helpful. Order came on time.  I visit a few shops around estate and they had the best prices. Definitely I will recommend BBL Batteries to my frends. Very pleased. Thanks.


barbara brown 03 December, 2019 Reply

Very friendly, helpful quick service and a reasonable price for a new battery. Thanks


joanna wiggans 22 August, 2019 Reply

Went in today for new leisure battery.  What fabulous service offered, so helpful and knowledgable. Fitted and very good value.  put me in a good mood for the rest of the day

fabulous customer service


Debbie cantin 15 July, 2019 Reply

Lee in the Plympton branch helped me today. I was in a bit of a stress as my battery was flat and the RAC signposted me to your store.
Lee was really professional and helpful , he changed my battery for me and I would definitely recommend BBL to friends and family. Thanks Lee!


Paul Compton 09 July, 2019 Reply

Excellent and friendly service. Matched the price of a competitor. Very helpful. Knowledge staff. Would definitely come again.


Martin Collenette 21 June, 2019 Reply

Mike in Truro is a battery hero!! He managed to get my wife’s old electric bike’s battery repacked and rejuvenated via Bristol battery repacking department. The alternative was a new one at twice the price and a possible 3 to 4 months delay. Fantastic, thanks to all concerned. Regards Martin Collenette



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