A lead-acid charger never finishes a lithium battery · review

Victron Energy Blue Smart 12 V 15 A, IP65, seven-stage review

A 15 A IP65 charger with a seven-stage algorithm, integrated Bluetooth, and a forced charge function with a built-in desulfator for reviving deeply discharged batteries.

By Jean-Benoit Buisson

The bottom line The only mains charger here with a published enclosure rating and Bluetooth, with a seven-stage algorithm and a recovery function for flat batteries. Seven stages are named and not one voltage is given.

A 15 A charger that can be left in a wet locker and read from a phone.

IP65

Stated in the title. Across five mains chargers in this catalogue, one publishes an ingress rating. On a boat or in a van locker that is the specification that decides whether the charger survives its installation.

Seven stages, no voltages

Bulk through to float, described as optimal and gentle. The stages are named and the voltages are not — not absorption, not float, not the storage level. For a charger serving both lead-acid and lithium, those are two different sets of numbers and neither appears.

The recovery function

Forced charge with an integrated desulfator, for deeply discharged or apparently dead batteries. Desulfation is a lead-acid process; the listing places it alongside lithium support without explaining how the profiles differ.

The monitoring

Integrated Bluetooth with VictronConnect, so charge state can be read without opening anything. On a charger fitted permanently in an awkward place, that is what makes it usable.

Availability

German, Italian and Spanish Amazon stores quoted 116 € to 158 € when this page was compiled.

British Amazon store carries it too, priced in its own currency, which the euro range above deliberately omits.

American and French Amazon stores returned nothing at all, so the buy button there runs a search instead of landing on an empty page.

These figures are what Keepa reported on the day this page was last updated. Availability and pricing move without notice.

Prices quoted in this text were read on 16 September 2026. The live price is at the top of the page.

What it gets right, and what it leaves out

Strengths

IP65 on a mains charger, so it can live in a locker or a damp workshop
A seven-stage algorithm with bulk and float both named
Bluetooth for monitoring from VictronConnect without opening the locker

Compromises

Seven stages are named and not one voltage is published
The desulfator applies to lead-acid; how the lithium profile differs is not described
No low-temperature behaviour

Specifications

Charge current	15 A at 12 V, from the title
Absorption	Named as a stage within the seven-stage algorithm, fourth bullet; no voltage is published
Float voltages	Float is named as the final stage, fourth bullet; no voltage is published
Profiles	Lead-acid and lithium-ion at 12 V or 24 V, first bullet, with motorcycle batteries also named
Low-temperature behaviour	Nowhere in the listing
Connectors	CEE 7/17 mains plug, from the title; output connectors are not described
Protections	Absent as a list; IP65 is stated in the title, with a forced charge function and integrated desulfator named in the second bullet
Amazon reference	B01JRZTAUO (same reference on 4 Amazon marketplaces)
EAN	8719076018025

Questions owners ask about this one

What does a seven-stage algorithm add over three?

More intermediate steps — typically a test phase, a recovery phase and a storage phase around the usual bulk, absorption and float. Whether that matters depends on the battery; what would settle it are the voltages, and this listing publishes none.

Does the desulfator affect a lithium pack?

Desulfation addresses lead sulphate crystals and has no equivalent on LiFePO4. The listing names it alongside lithium support without saying how the two interact, which is a question for the manual before a lithium pack is connected.