How the Battery VRLA Charger Works
VRLA cells — AGM, gel, and sealed SMF types — have one failure mode that cannot be corrected after it occurs: overcharge. When a sealed cell exceeds its gassing voltage threshold, electrolyte escapes through the pressure valve and does not return. Capacity drops. Internal resistance rises. The battery fails before its rated life. This is not a fault in the battery. It is a failure of the charger.
A battery VRLA charger controls this by delivering charge in two distinct phases. In the first phase, Constant Current (CC), the charger pushes current at a fixed rate until the battery approaches full charge. In the second phase, Constant Voltage (CV), it holds the cell at a precise voltage ceiling — preventing gassing, preventing electrolyte loss, and allowing the battery to absorb the final charge without overcharge risk.
ELIND’s VRLA charger places the CC → CV transition point entirely in your hands. You set it based on your battery chemistry and application. The charger holds it, across every channel, on every cycle.
Battery VRLA Charger – Technical Specifications
| Parameter | Value |
| Input Voltage | Single Phase 200–240V or Three Phase 380–440V† |
| Input Frequency | 50 Hz |
| Output Voltage per Channel | 330V DC (20 × 12V batteries in series) |
| Output Voltage Accuracy (CV mode) | ±1% |
| Output Current — CC mode | 0–5A / 10A / 20A† |
| CC → CV Transition Point | User-settable |
| Output Ripple at Full Load | <5% |
| Control Technology | SCR/Thyristor — Constant Current → Constant Voltage |
| Transformer Type | Air-cooled† |
| Number of Channels | 1 / 3 / 6 / 12† |
| PLC Control Option | Available† |
| Data Logging (PLC-equipped units) | Optional Add-on (Parameters logged are Battery Voltage, Current, Current Step, Cycle Count, Process Time) † |
| Enclosure | MS enclosure, powder coated |
| Operating Temperature | 0–65°C |
| IP Rating | IP20 |
| Efficiency | >90% |
| Standard Lead Time | 3–4 weeks from confirmed order |
† Configured to your specification — contact ELIND for a quote.
Pre-Dispatch Testing
Every VRLA charger ELIND ships undergoes five in-house checks before dispatch:
- No-load output voltage verification
- On-load voltage check across the full DC output range
- Constant current regulation verified across the full settable range
- AC input current measurement at full load
- Output shunt millivolt measurement for current calibration confirmation
No unit leaves the Peenya campus without passing all five.
Applications of Battery VRLA Charger
- Battery manufacturing plants activating newly assembled VRLA, AGM, and gel cells — CC charges to approximately 90% SoC, CV holds at the gassing ceiling, and end-of-charge detection prevents overcharge on the first cycle. Customers in this segment include Yokohama Batteries, Leoch Batteries, Motolite Ventures, Power Industries.
- Data centres and UPS infrastructure maintaining float voltage across independent battery strings — each channel operates independently, so a deviation on one string does not affect the others. Tier III and Tier IV facilities use this battery VRLA charger configuration for continuous float maintenance after discharge events.
- Solar off-grid installations requiring three-stage CC-CV-float profiles with temperature compensation for sites operating across wide ambient temperature swings — relevant for MNRE and PM-KUSUM battery bank installations in rural environments.
- Emergency lighting, fire alarm, and building services battery banks requiring continuous float charge with periodic equalisation cycles — the programmable profile adapts to the charge specifications of different VRLA battery brands without rewiring or hardware changes.
Why Battery Manufacturers Choose ELIND
- Transformer-based construction handles Indian industrial power conditions. Switch-mode power supplies (SMPS) are sensitive to voltage sags, spikes, and harmonic distortion common in industrial estate power supplies. ELIND’s transformer-based SCR design tolerates these conditions without tripping or degrading current regulation. Battery plants in Bengaluru, Tamil Nadu, and North India have been running ELIND charging equipment for 10–15 years on these same grids.
- Multiple channels in a single unit — each independently controlled. A 12-channel configuration simultaneously charges 240 batteries (20 per channel at 330V series). Each channel operates on its own CC → CV profile. One channel completing early does not affect the others. For battery manufacturers running multiple activation bays, this is a significant throughput advantage over single-channel or paired-channel alternatives.
- PLC-equipped units log the data your audits and OEM customers will ask for. Battery Voltage, Current, Current Step, Cycle Count, and Process Time are recorded per channel, per cycle. For manufacturers supplying automotive OEMs or export markets — where batch traceability is contractual, not optional — this removes the paper logbook from your QC process and replaces it with timestamped electronic records.
Battery VRLA Charger – Available Models
Model designation: [Channels]CH BCCV [Output Voltage]-[Max Current]
| Configuration | Channels | Batteries per Cycle | Current per Channel |
| 1CH BCCV 330-xx | 1 | 20 | To specification† |
| 3CH BCCV 330-xx | 3 | 60 | To specification† |
| 6CH BCCV 330-xx | 6 | 120 | To specification† |
| 12CH BCCV 330-xx | 12 | 240 | To specification† |
† Configured to your specification — contact ELIND for a quote.
Model designation: BCCV [Max Voltage]-[Max Current]. Example: BCCV 330-05 charges up to 20 batteries connected in series at a maximum current of 5A.
Standard lead time: 3–4 weeks from confirmed order and advance receipt. Minimum order quantity: 1 unit.
All units are built to order. Custom configurations — including non-standard channel counts or current ratings above 5A — are available. [Contact us for specifications]
Get a Quote or Technical Datasheet of the Battery VRLA Charger
To request a quotation of the battery VRLA charger, specify your battery type (VRLA/AGM/Gel), number of batteries per channel, nominal voltage, and desired current per channel — ELIND will return a formal proposal within 48 hours. Send us an email or call us / drop us a message on WhatsApp for more details.
Frequently Asked Questions
Q1: What stops this charger from overcharging a sealed VRLA cell?
The charger operates in two phases. In the Constant Current phase, it delivers charge at a fixed rate until the battery approaches full charge. It then switches to Constant Voltage mode — holding output at a user-set ceiling that you define based on your battery chemistry — and stays there until charge current tapers to the end-of-charge threshold. The CC → CV transition point is not fixed at the factory; you set it to match your specific battery supplier’s gassing voltage specification. This is the critical control that prevents electrolyte loss in sealed cells.
Q2: We charge batteries in banks of 20 at a time. Can this unit handle our layout?
Yes. Each channel on this unit is configured to drive 20 batteries connected in series at 330V DC — that is the standard output per channel. If your banks run at a different series count or a non-standard voltage, that is a configuration parameter confirmed at order stage. Available channel counts are 1, 3, 6, and 12, meaning a 12-channel unit charges up to 240 batteries simultaneously, each bank on its own independent CC-CV profile.
Q3: Our VRLA batteries are specified at a maximum charge voltage of 14.4V per 12V unit. Can we set the CV transition point to that exact ceiling — and will the charger hold it reliably across all channels?
Yes. The CC → CV transition point on ELIND’s VRLA charger is fully user-settable, and the CV output holds at ±1% of the set value. For a 20-battery series string at 330V output, that means each 12V cell is held within ±0.14V of your specified ceiling — accurate enough for AGM and gel chemistries where the overcharge margin is narrow. Every channel operates independently, so one string reaching CV does not pull the others out of their CC phase.
Q4: Our plant runs on a DG set during load-shedding. Will the charger hold current regulation when input voltage drops?
The transformer-based SCR design is built for exactly this condition. Unlike SMPS-based chargers — which trip or lose regulation when input voltage sags below threshold — the transformer-based topology tolerates the voltage fluctuations and harmonic distortion typical of DG set supply in Indian industrial environments. Current regulation accuracy in CC mode is maintained at ±5% of full-scale across the settable range. This is one of the primary reasons battery manufacturers in locations with unreliable grid supply specify transformer-based equipment over switch-mode alternatives. Additionally, in case of power failure, the controllers will hold the data in memory and start the process from the same point upon resumption of power.
Q5: Our OEM customer is asking for batch charging records. Can this charger generate them?
PLC-equipped configurations log five parameters per channel per cycle: Battery Voltage, Current, Current Step, Current Cycle number, and Process Time. These records are exportable and suitable for batch traceability documentation. If your OEM or export customer specifies what format or data fields they require, confirm that at the enquiry stage — the PLC configuration is specified to order, and ELIND can align the data output to your audit requirement before the unit ships.
Q6: If something goes wrong after installation, how do you support us?
ELIND’s service support operates from the Peenya campus in Bengaluru. For diagnosis, spare parts, and remote guidance, response is fast — ELIND designed and built the equipment in-house, so there is no third-party dependency in identifying or sourcing a fix. Physical on-site service visits outside Bengaluru are available at an additional charge and are arranged case by case. The practical mitigation for remote plants is that transformer-based SCR equipment has fewer failure-prone components than IGBT or switch-mode systems — and ELIND’s pre-dispatch testing (five checks including full-load regulation verification) is designed to surface faults before the unit reaches your plant, not after.