Wholesale Batteries & Storage Suppliers

Chemistry and what it means

Battery chemistry shapes safety, lifespan and cost. Lead-acid types are cheap and familiar but heavy and have a shorter cycle life. Lithium iron phosphate cells are widely used in home and mobile storage for their stability and long cycle life. Other lithium chemistries offer higher energy density but are handled with more caution. Ask for the chemistry, not just a type name, and check what the supplier means by capacity. Usable capacity can be well below nominal capacity, and depth of discharge limits matter. Ask for the guaranteed cycle count at a stated depth of discharge and temperature.

Management system and compatibility

A lithium battery needs a battery management system that controls charging, discharging, temperature and cell balance. Ask what protections it includes and whether it communicates with inverters, because a battery that does not talk to the inverter can't be used at full capability. Check voltage, maximum charge and discharge current, and the list of approved inverters. Stackable modules should state limits on how many can be combined.

Safety certification and transport

Lithium batteries must pass transport testing, and they are classed as dangerous goods for road, sea and air. Ask for the transport test summary and the dangerous goods classification, and be aware that carriers may refuse them or require specialist handling. For product safety, look for the standards and marks that apply in your market, including electrical safety, and check the rules for your market. Some countries require certification for stationary storage, and insurers may insist on it. Reject any supplier unwilling to show test documents. Damaged batteries should not be shipped or sold, and you need a plan for returns of faulty units, which can be hazardous.

Disposal and producer responsibility

Batteries come with end-of-life rules in many markets. These can include registration as a battery producer, collection obligations and labelling. Check the rules for your market, because as an importer you may carry these duties.

Storage and handling

Store batteries in cool, dry places, partly charged, and away from flammable stock. Warehouse insurance may be affected by lithium storage, so check with your insurer. Long storage causes self-discharge, so ask for production dates, and do not buy old stock that has sat discharged.

Counterfeit and grade risk

Cells are sometimes relabelled or sold as higher capacity than they are, and used or reject cells can be repackaged. Be sceptical of capacity claims that look too good for the price, and ask for independent capacity test results for the batch.

Margins

Prices follow cell costs and fall over time. Margins are modest on bare batteries, better on complete systems with installation support, and warranty claims can be costly.

What to ask a supplier

• What is the chemistry, usable capacity and guaranteed cycle life?
• Which inverters is the battery compatible with?
• What transport and safety certificates do you hold?
• What are the warranty terms and how are claims handled?
• What is the production date of the stock?