• Use only distilled or demineralized water. The conductance may be max. 10 µS / cm.
• Refill the battery only during charging. The optimal time is shortly before the end of the charging process.
• The filling system requires a minimum pressure of approx. 0.2 bar in order to function, or a container height of at least 2 m above. The manual pump and our electric pumps deliver a pressure of> 0.2 bar.
• Observe the filling on the flow indicator. At the beginning, the balls rotate very quickly, later on they slow down to a standstill. If the system is filled and no more flow is visible, interrupt the water supply within 5 minutes by removing the coupling.
• Avoid filling intervals that are too short or too long. Experience has shown that a period of one week is sufficient. This value may vary depending on the use or charge of the battery.
• Pay attention to the level indicator or note the values when / how often you fill.

At first glance, the hand pump may seem simple, but it is truly ingenious in its function.

It is not only useful when there is no gravity tank available, but also offers a much more efficient filling process thanks to the increased pressure and interval-based delivery. Each pump stroke dispenses approximately 40 ml of water at up to 2 bar pressure. This is particularly beneficial for batteries that are filled infrequently, as it helps break down stubborn deposits in the filling system.

The increased pressure ensures that floaters and internal valves are flushed more effectively, improving the overall efficiency of the system. Once all the caps close, the process is clearly felt and reliable. The gradual overfilling that often occurs with gravity filling is eliminated with this hand pump.

Our hand pumps come fully equipped with the corresponding canister cap and only need to be placed on the tank. No gravity, no electricity – just pump, and your battery is filled.