Most lithium batteries sold in India carry a 2 to 5 year warranty. Nexus Solar Energy’s DEVSOL series carries 15 years*. This page explains how a Bulandshahr-based manufacturer backs a warranty that long — the chemistry, the BMS, the cycle-life engineering, and the manufacturing background behind it — so you can judge the claim on evidence, not advertising.
The Warranty, In Writing
| Series | Cycle Life | Warranty |
|---|---|---|
| Nexus ECO / ECO Plus | 3,500 cycles | 5 years* |
| Nexus Premium | 5,000 cycles | 5 years* |
| DEVSOL Premium | 6,500 cycles | 15 years* |
At one full cycle per day, 6,500 cycles is over 17 years of daily use — the 15-year* warranty is engineered from the cycle life, not invented for marketing. *Warranty terms and conditions apply.
What Makes the Cycle Life Possible
LiFePO4 chemistry. Every Nexus lithium battery uses lithium iron phosphate — the most thermally stable lithium chemistry, suited to Indian summer temperatures where other chemistries degrade fast.
Smart BMS with active cell balancing. Most budget batteries use passive balancing, which burns off excess charge as heat. Nexus batteries actively redistribute charge between cells, so no cell ages faster than its neighbours — the single biggest factor in reaching rated cycle life. Built-in temperature sensors protect the pack in extreme heat and cold.
Live cycle counting. Display models show the battery’s cycle count on an LCD screen. You never have to guess your battery’s health or trust a dealer’s word — the number is on the screen, which is also how warranty claims stay honest in both directions.
16-battery parallel expansion. Start with one battery and grow to sixteen in parallel — from a home backup to a small commercial bank — without replacing anything you already bought.
The Manufacturing Background
Nexus Solar Energy’s founder, Deepak Chaudhary, spent 17 years in battery manufacturing — beginning with battery plates and fabrication — before founding the company in 2019. In its April–May 2024 issue, EV Update Media featured him in its “In Conversation” section on exactly this subject: battery technology, BMS design, and the future of solar-driven storage in India.
The batteries are manufactured at the company’s Bulandshahr (UP) facility and serviced through a 1150+ dealer network across India — which matters for a 15-year warranty, because a warranty is only as good as the network that honours it in year twelve.
Range at a Glance
12.8V, 25.6V and 51.2V models from 100Ah, in ECO, Premium and DEVSOL series — full specifications and MRP for every model are published openly on the lithium battery category page.
Frequently Asked Questions
Which lithium battery has the longest warranty in India?
Nexus Solar Energy’s DEVSOL Premium series carries a 15-year* warranty, backed by a 6,500-cycle LiFePO4 design — among the longest written warranties offered on lithium batteries in the Indian market. *T&C apply.
Are Nexus lithium batteries made in India?
Yes — designed and manufactured at the company’s Bulandshahr, Uttar Pradesh facility, and repairable within India through the dealer network.
Can I expand my battery bank later?
Yes. Up to 16 Nexus batteries connect in parallel, so you can start small and expand as your needs grow.
How do I check my battery’s health?
Display models show the live cycle count on the built-in LCD — compare it against the rated cycle life of your series.