Forklift Lithium Batteries

Converting a forklift from lead-acid to lithium

A forklift lithium battery is built around the truck it powers. Converting from lead-acid starts with the existing installation, not with a stock pack: system voltage, compartment size, ballast weight and connector type all set the limits of what will physically drop in and run. These points are confirmed per truck model and project before any specification is written, because two trucks of the same nominal capacity can differ in what the bay will accept.

The lead-acid replacement decision is mostly about the truck, not the cell. Lead-acid batteries carry part of the counterweight duty on many forklifts, so a lighter lithium pack changes how the truck balances with a load raised. That is why weight and ballast requirements belong in the first conversation, together with the compartment dimensions and the connector the truck already uses. Get those wrong and the pack either will not fit or will not be accepted by the operator.

Electric forklift battery packs also change the charging routine. Where a lead-acid truck expected a battery change between shifts, a lithium pack is normally charged in place during breaks and between shifts. That shift in routine is a workflow question as much as an electrical one, and it affects where chargers are placed and how the fleet is scheduled.

Voltage, compartment and ballast: the fit checklist

A lithium replacement must match the truck's system voltage. The pack range covers 24V and 48V classes, and the specific truck class is confirmed per project; the truck's own data plate and controller set what the pack has to deliver, and that is matched rather than assumed.

Compartment dimensions come next. The battery bay sets length, width and height limits, and the pack is built to fit the space the truck provides, including clearance for the connector and any restraint the truck uses. A pack that fits the bay but blocks the connector or the restraint is not a fit.

Ballast and weight follow. Because lithium packs are lighter than the lead-acid blocks they replace, the counterweight effect has to be checked against the truck's stability requirements with a load raised. On some trucks this is a straightforward substitution; on others it changes the specification.

The connector and the truck's communication and safety interfaces are checked last. The connector type, the discharge path and any interface the controller expects are confirmed against the truck, so the pack talks to the machine the way the original battery did. Working through this list in order is how we check a forklift conversion before quoting.

Opportunity charging and multi-shift duty

Opportunity charging is the operating pattern lithium makes practical on a forklift: the truck is plugged in during breaks, at shift change and whenever it is idle, instead of running a full discharge and a battery swap. For multi-shift duty this changes how a fleet is planned, since the truck no longer needs a fresh battery dropped in at every changeover.

The electrical reason is that lithium packs accept charge without the strict full-cycle discipline lead-acid needs. In practice that means the charger becomes part of the truck's routine rather than a separate battery room operation. Charger placement, cabling and the break schedule all need to line up so the truck actually gets the charge window the plan assumes.

For a fleet, the result is usually fewer batteries in rotation and a simpler changeover. The exact duty pattern is set per site, and the pack specification follows the truck and the charging routine rather than the other way round. Where a site runs several shifts, this is worth mapping out before the conversion rather than after.

Both voltage classes are built as standard lines: 24V lithium packs for the smaller trucks and 48V lithium packs for the larger ones. The truck's class decides which applies.

UN38.3, IEC 62133 and MSDS documents can be confirmed and provided for specific models. Tell us the model you are buying and we will confirm which documents cover it. The packs are built under ISO 9001 and ISO 14001 certified processes.

Frequently Asked Questions

Can lithium packs replace lead-acid forklift batteries?

Yes, as a conversion matched to the truck. A lithium replacement has to match the truck's system voltage, fit the compartment dimensions, meet the weight and ballast requirements, and use the right connector; these are confirmed per truck model and project. The pack is specified around the existing installation, so the truck's data plate and battery bay are the starting point, not a stock size.

What voltages do forklift packs come in?

Forklift packs are built to the truck's voltage class. The pack range covers 24V and 48V classes, and the specific truck class is confirmed per project. The truck's own electrical system sets the requirement, so the voltage is matched to the machine rather than chosen from a list. Tell us the truck model and we will confirm the class that applies.