Knapsack and powered sprayers almost all run a 12V pump, and almost all ship with a sealed lead-acid battery that is heavy, slow to charge, and finished after a season or two of daily use.
Why lithium suits this job
- Weight. The battery is carried on the operator's back all day. A lithium pack of the same capacity is a fraction of the weight.
- Usable capacity. Lead-acid should not be run down past roughly half; a lithium pack can use most of what it holds. In practice that means more tanks per charge from a smaller battery.
- Cycle life. Daily discharge is exactly the duty that kills a lead-acid battery quickly.
Sizing it for the pump
The pump motor draws a steady current while spraying and a higher one at start. We size the pack and its BMS to that draw so the sprayer does not cut out mid-tank, and we build to the original battery compartment so it clips back in as before.
Change the charger too
If the sprayer came with a lead-acid charger, it must be replaced along with the battery. This is not optional — a lead-acid charge profile applied to a lithium pack will damage it and is unsafe.
What to send
A photo of the existing battery, its label and the compartment, plus how many hours of spraying you need per charge. For a fleet of sprayers, one sample is enough for us to quote the set.
Send us the voltage, capacity, discharge current and the space you have — or a photo of the battery you are replacing. We will come back with a specification and a price.