LG INR18650-MJ1 3500mAh 10A Button Top Battery 6-Pack with XTAR VC4SL & MC1 Chargers – High-Capacity Long-Run Power Kit for Flashlights, Power Stations & Outdoor Gear

What's in This Bundle

• 6x LG INR18650-MJ1, 3,500mAh, Button Top
• 1x XTAR VC4SL 4-slot LCD USB-C charger
• 1x XTAR MC1 single-slot USB-C charger
• Cables, manuals, and storage pouch included with both chargers

This bundle exists because there's no clean single charger that handles exactly 6 cells at once. Rather than force you into a mismatched combo, we've paired the 4-slot VC4SL with the compact single-slot MC1 — together they give you 5 charging slots, so 5 of your 6 cells can charge at the same time, with the last one following right behind.

A note on Button Top length: converting the MJ1 to Button Top adds roughly 2mm to the cell's overall length compared to the native Flat Top version. This is standard for the conversion and shouldn't cause fit issues in devices designed for Button Top 18650s, but it's worth knowing if you're working with a tight battery compartment.

This listing is for Button Top. Looking for Flat Top? Click here to buy: LG INR18650-MJ1 Flat Top + XTAR MC4S 4  XTAR MC1  Bundle.

Why This Pairing Makes Sense

The MJ1 was, at release, one of the highest-capacity 18650 cells on the market — LG's NMC811 chemistry with a silicon-graphite anode pushes energy density further than most cells in this size while still holding a genuine 10A continuous discharge rating. Six cells bought together as a matched set means consistent capacity and internal resistance across the whole group — which matters more than usual here, since independent testing has shown some batch-to-batch capacity variability with this cell. Button Top is the terminal type required by devices with spring-loaded battery contacts.

The VC4SL handles the bulk of the charging with its LCD display and capacity-test (grading) mode — a genuinely useful check for this cell given that documented batch variability. The MC1 rounds things out as a small, genuinely portable single-slot charger — useful on its own for topping off a spare cell, throwing in a bag, or keeping in the car, not just as filler to hit a slot count.

LG INR18650-MJ1 — Battery Specs

A note on real-world capacity: independent lab testing has shown this cell's actual measured capacity can run somewhat below its 3,500mAh nominal rating in some batches — one third-party comparison test measured roughly 3,205-3,384mAh depending on discharge rate, noticeably below the datasheet figure. This isn't unique to the MJ1, but it's a genuine reason to prioritize matched-batch, verified sets like this bundle over mixing cells from different orders.

This listing is for Button Top. For Flat Top click here

XTAR VC4SL — Charger Specs (4 Slots)

XTAR MC1 — Charger Specs (1 Slot)

A realistic note on charging all 6: the MJ1's own standard charge current is 1.675A, meaningfully above the 1A per slot both the VC4SL and MC1 deliver — a conservative, safe rate across all 5 active slots. Expect a full charge in roughly 4.5-5 hours for those 5 cells, with the 6th following once a slot opens up.

Why the Capacity Test Mode Matters for a 6-Pack

This is one of the clearest cases in our lineup for why grading mode earns its keep. Independent testing has already shown this cell can land meaningfully under its nominal rating depending on batch — buying six cells and being able to verify their actual measured capacity, rather than just trusting the 3,500mAh figure, tells you what you actually have before you build a pack around it. Run them through the VC4SL in two batches of four (with the MC1 handling overflow) and flag any cell with a wider gap during testing rather than mixing it into a tight pack build.

Where the MJ1 Actually Fits

• High-capacity flashlights and headlamps running moderate-to-high output modes
• E-bike and e-scooter packs where 10A per cell in parallel is sufficient
• 6S, 2S3P, 3S2P, or similar DIY pack configurations prioritizing energy density with more current headroom than pure energy cells
• DIY power banks and backup builds wanting more runtime per cell than lower-capacity options, built from a verified matched set

Not the right choice for sub-ohm mechanical mods, or anything regularly demanding more than 10A per cell — for those, a dedicated high-drain cell like the Samsung 25R or 30Q is a better match.

Things Worth Knowing Before You Use This Kit

• This is an unprotected cell. Both chargers enforce their own voltage and current cutoffs, but your device still needs to handle discharge-side protection.
• Don't mix these cells with older ones you already own, even if they're also MJ1. Given the batch-to-batch capacity variability noted in independent testing, running the grading test before combining batches is genuinely worthwhile.
• 10A is a real ceiling. Don't use these in devices that regularly demand more current than that.
• The MC1 charges one cell at 1A — it's not meant to replace the VC4SL for bulk charging, just to round out the slot count and serve as a lightweight backup charger.

Frequently Asked Questions

Can all 6 cells charge at the same time? 5 of the 6 can charge simultaneously — 4 on the VC4SL, 1 on the MC1. The 6th cell follows once a slot frees up.

Can this charger really tell me if a cell is underperforming? Yes — the grading/capacity test mode charges, discharges, and recharges a cell while measuring the actual capacity delivered, rather than relying on the printed rating. Given the batch variability documented for this cell, that's a genuinely useful check.

Why might my actual measured capacity come in under 3,500mAh? Independent testing has shown some batch-to-batch variation with this cell, with measured capacity sometimes landing in the 3,200-3,400mAh range depending on discharge rate and batch. It's still a genuine high-capacity cell — just worth knowing that the nominal figure is a typical rating, not a guarantee for every individual unit.

Does Button Top affect fit in my device? It adds roughly 2mm to the cell's overall length compared to Flat Top. Most devices designed for Button Top 18650s account for this, but it's worth checking your battery compartment if space is tight.

Is this kit protected-cell compatible? Both chargers support protected 21700 cells (the VC4SL also supports protected 20700) if you use them for those later. The LG MJ1 cells included in this bundle are unprotected bare cells, standard for this model.

In stock now. This bundle ships as a matched set of six genuine LG INR18650-MJ1 Button Top cells with a verified XTAR VC4SL and XTAR MC1 charger combo — ready for high-capacity flashlights, e-bikes, and general electronics out of the box.