What we've added

We've introduced a budget leisure battery range from Dynamp, sitting alongside our Fogstar lithium range for anyone who wants a lower-cost entry point:

• Dynamp DA602 12V 60Ah AGM Leisure Battery — £71.99
• Dynamp DB741 12V 74Ah EFB Leisure Battery — £69.95
• Dynamp DA702 12V 70Ah AGM Leisure Battery — £79.99

AGM vs EFB, quickly explained

AGM (Absorbed Glass Mat) batteries use lead-acid chemistry with the electrolyte held in a glass mat rather than free-flowing liquid, making them sealed, maintenance-free and spill-proof. EFB (Enhanced Flooded Battery) is a step up from standard flooded lead-acid, offering better cycling ability than a basic car battery, but generally sitting a notch below AGM for deep-cycle leisure use. Both are well-established, dependable technologies, they're just not lithium.

What you're trading off versus lithium

Being upfront about this matters, since it's the honest reason lithium costs more. AGM/EFB batteries are generally only safe to discharge to around 50% of their rated capacity to protect their lifespan, so a 70Ah AGM battery gives you roughly 35Ah of genuinely usable power, not 70Ah. Lithium, by comparison, can typically be discharged to 80-100% of its rated capacity.

Cycle life is the other big difference. AGM batteries are typically rated for a few hundred cycles, while LiFePO4 batteries like Fogstar's Drift range are rated for thousands. AGM batteries are also considerably heavier for the same capacity, and slower to recharge.

What you gain is a genuinely lower upfront cost, and AGM/EFB remains a completely safe, proven technology, it's simply an older one with different trade-offs.

Who a budget AGM battery actually suits

• Occasional weekend use — light loads like lighting and USB charging, where you're not draining the battery hard or often
• Tight budgets — getting a build electrically functional now, with the option to upgrade to lithium later once funds allow
• Backup or secondary power — a second battery for a specific circuit rather than your whole system's main bank
• Simple, low-maintenance setups — where the size and weight of AGM aren't a practical constraint

If you're planning heavy daily use, running an inverter for appliances, or building a full off-grid system from scratch, it's worth reading our lithium vs AGM comparison before deciding, since the usable capacity difference alone often changes which option actually works out cheaper for your build.

Shop the budget range

All three Dynamp batteries are in stock now, alongside our Fogstar lithium range, so you can compare both and pick what actually fits your build and budget.

Shop budget leisure batteries here:
https://sonniesadventures.com/collections/budget-leisure-batteries

FAQs

Is a budget AGM battery good enough for a campervan?

For light, occasional use, yes. For daily off-grid living or heavy inverter use, lithium's higher usable capacity and longer lifespan usually work out better value.

What's the difference between AGM and EFB?

AGM uses a glass mat to hold the electrolyte and generally handles deep cycling better. EFB is an enhanced flooded battery, a step up from a standard car battery but usually below AGM for leisure/deep-cycle use.

How much of a 70Ah AGM battery can I actually use?

Roughly 50% (around 35Ah) is the safe usable amount, to protect the battery's lifespan. Discharging further regularly will shorten how long it lasts.

Can I upgrade from AGM to lithium later?

Yes, this is a common approach, start with a budget AGM battery to get your build running, then upgrade to lithium once your budget allows. Just check your charging equipment when you switch, since lithium needs a different charging profile.

Do these budget batteries come with a warranty?

Yes, the Dynamp range carries a 4-year manufacturer-listed warranty.