Sunder is a China-based supplier concentrating on two chemistries: lithium iron phosphate (LiFePO4) and cylindrical 18650 lithium-ion. We ship loose cells to pack makers, finished packs to equipment brands, and 48V storage units to energy integrators — from a first trial quantity up to volume orders.
Pick the level of integration you need. Every model is listed with its cell type and its series/parallel layout, so an engineer can compare like for like.
Cylindrical and prismatic lithium iron phosphate cells for companies that assemble their own modules.
See cell formats →
6.4V to 48V packs, including drop-in cases sized like sealed lead acid blocks.
See assembled packs →
3.7V cylindrical cells and the tool, lighting and e-bike packs made from them.
See 18650 options →Overseas purchasers usually come to us after one of four headaches. Our job is to remove them before the goods leave Shenzhen.
We answer with published data sheets, OEM/ODM engineering input, export documents on request, and order sizes that start small.
Typical projects from our customers, grouped by the kind of load they power.
Off-grid banks, household storage and solar street lighting on LFP packs.
18650 and LFP assemblies for bicycles, scooters and tricycles.
Grade-A 18650 cells for drills, saws and garden equipment.
Fans, speakers and handheld products running on 18650 cells.
Custom packs for monitoring gear and backup supplies.
LFP packs for guided vehicles and service robots.
Iron-phosphate batteries for emergency and communications backup.
Deep-cycle LFP for caravans and portable power stations.
An iron-phosphate cell is rated 3.2V nominal and is charged to 3.65V. Put four in series and you get a 12.8V pack that is charged at 14.6V.
Constant current first (normally 0.2C–0.5C, 1C at most), then constant voltage at 3.65V per cell until the current falls away, at room temperature.
Our packs carry a protection board (PCB/PCM) that guards against over-charge, over-discharge and short circuit. Keep the battery away from heat and fire, and do not crush or puncture it.
Yes. Trial quantities are accepted, and samples can be requested once the price has been agreed.
Send the voltage, capacity, peak current and the space available — a drawing helps.