One Battery Partner, Many Industries
Custom Lithium Battery Packs for 15+ Industries
From drones and POS terminals to medical devices, robotics and IoT — Leolus Energy designs and manufactures custom lithium battery packs for the industries that keep India moving. Find your application below.
Every industry has its own demands — a warehouse scanner needs all-day runtime, a medical monitor needs flawless reliability, an AGV needs high discharge and fast charging. As a Bangalore-based lithium battery manufacturer with 9+ years of experience, we engineer each pack for the real conditions of its application, with a multi-layer BMS built into every one.
Which pack does your product actually need?
Most enquiries arrive asking for a voltage and a capacity. Those two numbers are usually the last things we settle, not the first. What decides the pack is the duty cycle — how hard the device pulls current, for how long, and in what ambient temperature. Get that wrong and a technically correct 7.4V 5000mAh pack still fails in the field.
Here is the shorthand we use internally when a new application comes in.
| If the device… | The binding constraint is | What that changes in the pack |
|---|---|---|
| Runs all shift at a low, steady draw — scanners, POS terminals, weighing scales, data loggers | Energy density and self-discharge | High-capacity Li-ion cells, low-quiescent BMS. Discharge rating is nearly irrelevant here; a 1C cell is fine and costs less. |
| Draws hard in bursts — thermal printers, AGV drive motors, powered medical carts | Continuous and peak discharge | Cell chemistry shifts to high-rate. The BMS over-current threshold and the interconnect gauge become the design bottleneck, not capacity. |
| Sits outdoors or in an unconditioned space — telecom cabinets, solar street lights, security cameras | Temperature range and cycle life | LiFePO4 over Li-ion, low-temperature charge cut-off in firmware, and a wider derating margin on rated capacity. |
| Has to fit an existing cavity — retrofits, handheld instruments, consumer devices | Form factor | Cell format is chosen last and everything else bends around it. This is where custom pack design earns its cost versus an off-the-shelf brick. |
| Flies — any UAV payload | Watt-hours per kilogram | Every gram of pack is a gram of payload you do not carry. Different problem entirely; see our drone battery range. |
What we need from you to quote accurately
A quote built on voltage and capacity alone is a guess, and guesses get revised upward later. Five answers let us price a pack properly the first time:
- Continuous current draw, and the peak. Peak matters even if it lasts two seconds — it sizes the BMS and the cell.
- Required runtime per charge, and cycles per day. One deep cycle a day and four shallow ones age a pack very differently.
- Charge method and time window. Overnight charging and a two-hour turnaround are different packs.
- Ambient temperature at the worst end. Not the average — the worst. A pack specified for 25°C in a Chennai warehouse loft is under-specified.
- Dimensional envelope and connector. Send the cavity drawing if you have one, or the pack you are replacing.
If you do not have all five, send what you have. We would rather ask two questions than quote a pack you cannot use.
Three things buyers underestimate
Cell grading matters more than cell brand. A pack is only as good as its weakest cell, because the BMS balances to it. We grade and match cells in-house by capacity and internal resistance before assembly. Two packs built from the same reel of cells can differ by 15% in usable life depending on whether anyone bothered to sort them.
Rated capacity is a claim until someone tests it. Since the February 2026 MeitY order, rated capacity on BIS-registered lithium cells has to be a lab-verified number. Ask any supplier what their rated capacity is measured at, and at what discharge rate. If the answer is vague, the number is decorative.
The replacement cycle is part of the purchase. A pack that costs 20% less and lasts 40% fewer cycles is not cheaper. For fleet deployments — delivery, agriculture, rental equipment — the second purchase usually arrives sooner than the budget assumed.