Batteries usually aren't the actual problem
When a boat won't hold a charge, the battery itself is often a symptom rather than the cause. We test the bank under load, check the charging system, the alternator output, voltage drop across cabling and the state of the isolators and switches. If the battery is genuinely dead we'll tell you — and if it isn't, we'll show you the real fault.
Common battery and charging jobs
Replacing tired house banks, upgrading from lead-acid to AGM or lithium with correct charging profiles, fitting smart chargers and multi-stage chargers, installing battery monitors and balancers, repairing inverters and shore-power chargers, and resolving the parasitic draws that flatten boats sitting on the dock.
On-pier work, marine-grade parts
All battery work is done at the berth inside Kos Marina with marine-grade components — proper tinned cabling, marine fuses, IP-rated connectors. We label everything we touch and leave a short note explaining what was done.
What this typically covers
- Battery testing under load
- House and engine bank replacement
- AGM and lithium upgrades
- Smart and multi-stage chargers
- Battery monitors and BMS
- Inverter and shore-power charger repairs
- Parasitic draw diagnostics