Catalogue
46 published models across 7 lines. Every board is available for direct order, OEM branding and bulk distribution — contact NEEY sales for volume pricing.
Not sure which of the 46 fits your pack? Use the model finder →
Flagship
Bluetooth-enabled active balancers for 2S–24S lithium packs. A supercapacitor inside the balancer is charged by the strongest cell and discharged into the weakest one, repeatedly, until the pack is within your target delta-voltage. Balance current is set independently of cell delta-voltage, so a 300Ah pack balances just as hard as a 30Ah one.
4 A NEEY-24S4A · 2S – 24S
The entry point to app-controlled active balancing. 4 A of constant current through an onboard supercapacitor, ±1 mV cell acquisition, and a 140 × 128 mm board that fits most scooter and small-storage packs.
8 A NEEY-24S8A · 2S – 24S
Double the current of the 4A on almost the same footprint, and the first model in the range with a TTL port so the balancer can report to an external controller or charger.
10 A NEEY-24S10A · 2S – 24S
The 24S8A’s feature set at 10 A, in a slightly larger 166 × 157 mm board with heavier copper. Suited to 50 Ah–200 Ah traction and storage packs.
15 A NEEY-24S15A · 2S – 24S
The biggest balancer we build: 15 A of app-settable current, a 40S cascade example in the manual, and an over-balancing guard that halves the current automatically when the pack is already close to balanced.
Whole-pack, zero standby draw from the pack
A patented capacitor architecture where the whole battery pack participates in the energy transfer simultaneously instead of one cell pair at a time. No external power supply, no firmware, no app — solder the ribbon, and it runs 24 hours a day on the pack’s own energy.
5.5 A EK-C3S5A · 3S
Whole-pack simultaneous balancing for 3S packs, no external supply and no configuration. 45 g on the board.
5.5 A EK-C4S5A · 3S – 4S
Whole-pack simultaneous balancing for 3S–4S packs, no external supply and no configuration. 55 g on the board.
5.5 A EK-C5S5A · 4S – 5S
Whole-pack simultaneous balancing for 4S–5S packs, no external supply and no configuration. 70 g on the board.
5.5 A EK-C6S5A · 4S – 6S
Whole-pack simultaneous balancing for 4S–5S–6S packs, no external supply and no configuration. 85 g on the board.
5.5 A EK-C7S5A · 5S – 7S
Whole-pack simultaneous balancing for 5S–6S–7S packs, no external supply and no configuration. 95 g on the board.
5.5 A EK-C8S5A · 6S – 8S
Whole-pack simultaneous balancing for 6S–7S–8S packs, no external supply and no configuration. 105 g on the board.
5.5 A EK-C10S5A · 8S – 10S
Whole-pack simultaneous balancing for 8S–9S–10S packs, no external supply and no configuration. 130 g on the board.
5.5 A EK-C12S5A · 9S – 12S
Whole-pack simultaneous balancing for 9S–10S–11S–12S packs, no external supply and no configuration. 160 g on the board.
5.5 A EK-C14S5A · 9S – 14S
Whole-pack simultaneous balancing for 9S–10S–11S–12S–13S–14S packs, no external supply and no configuration. 180 g on the board.
5.5 A EK-C16S5A · 12S – 16S
Whole-pack simultaneous balancing for 12S–13S–14S–15S–16S packs, no external supply and no configuration. 205 g on the board.
5.5 A EK-C17S5A · 13S – 17S
Whole-pack simultaneous balancing for 13S–14S–15S–16S–17S packs, no external supply and no configuration. 225 g on the board.
5.5 A EK-C21S5A · 17S – 21S
Whole-pack simultaneous balancing for 17S–18S–19S–20S–21S packs, no external supply and no configuration. 250 g on the board.
Adjacent-cell transfer
Matrix-transformer boards that move energy between adjacent cells. At 4–60 grams they fit packs where a smart balancer would be overkill, and they still run entirely on the pack’s internal energy.
2 A DG-2S 2A · 2S
Adjacent-cell inductive balancing for 2S packs. 4 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-3S 2A · 3S
Adjacent-cell inductive balancing for 3S packs. 7 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-4S 2A · 4S
Adjacent-cell inductive balancing for 4S packs. 10 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-5S 2A · 5S
Adjacent-cell inductive balancing for 5S packs. 12 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-6S 2A · 6S
Adjacent-cell inductive balancing for 6S packs. 16 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-8S 2A · 8S
Adjacent-cell inductive balancing for 8S packs. 20 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-10S 2A · 10S
Adjacent-cell inductive balancing for 10S packs. 23 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-14S 2A · 14S
Adjacent-cell inductive balancing for 14S packs. 36 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-15S 2A · 15S
Adjacent-cell inductive balancing for 15S packs. 39 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-16S 2A · 16S
Adjacent-cell inductive balancing for 16S packs. 42 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-17S 2A · 17S
Adjacent-cell inductive balancing for 17S packs. 45 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-19S 2A · 19S
Adjacent-cell inductive balancing for 19S packs. 48 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-20S 2A · 20S
Adjacent-cell inductive balancing for 20S packs. 54 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-21S 2A · 21S
Adjacent-cell inductive balancing for 21S packs. 52 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
2 A DG-24S 2A · 24S
Adjacent-cell inductive balancing for 24S packs. 60 g, ten microamps at rest, and no external supply — the cheapest way to keep a pack from drifting.
Workshop & production line
Mains-powered bench instruments that balance a pack on the workbench before it is closed. Each channel of the pack is wired to the terminal strip, the unit reads every cell, and it runs discharge, constant-voltage or charge balancing until the strings match — then stops and alarms by itself. String count is recognised automatically, so one unit covers a whole range.
5 A NY-FD04AS24G · 2S – 24S
The simplest of the bench range: a fixed 5 A resistive discharge balancer for 2S–24S packs. Wire every tap to the terminal strip, start it, and it brings the strings down to match without any current to set.
1 – 7 A NY-FD24SCG-7 · 2S – 24S
Same discharge-only topology as the FD04AS24G but with a 1–7 A adjustable balance current, so you can match the discharge rate to how much capacity has to come off the pack.
0.1 – 14 A NY-FD14AS24CK · 2S – 24S
The highest-current instrument in the range at 14 A, and the only one that can balance upward: a PWM pulse discharge path plus a charge-balancing mode that tops the weak cells back up. Needs an external charger that can be adjusted and stopped automatically.
0.1 – 7 A NY-FD07AS24CK · 2S – 24S
The three-mode CK instrument at 7 A. Same discharge, constant-voltage and charge balancing as the FD14AS24CK, for shops that do not need the extra current headroom.
0.1 – 7 A NY-FD07AS48CK · 2S – 48S
The 48-string version of the CK instrument, for storage and telecom packs that no 24S unit can reach. Runs from a DC 220 V supply rather than the pack’s own voltage range.
High-voltage switching
Epoxy-sealed DC contactors with ceramic arc-extinguishing chambers for energy storage, EV and RV main-loop switching. Non-polar coils, optional auxiliary contacts and built-in coil economizers.
EV100 · —
A compact 100 A DC contactor rated 12–1000 Vdc with up to 125 kW switching capacity. Epoxy sealed, non-polar coil, mounts in any position.
EV500 · —
250 A switching with 500 A long-term carrying at 85 °C, a built-in coil economizer and optional auxiliary contacts for main-loop monitoring.
EV600 · —
Our highest-current contactor: 600 A switching at 12–1000 Vdc, ceramic arc-extinguishing chamber, and 2500 A overload disconnection.
Protection + balancing
Li-ion and LiFePO4 protection boards from 4S to 17S with integrated passive-to-low-resistance balancing, for packs that need protection and balancing in one board.
30 A NEEY 7S 30 A · 7S
7S protection board for Li-ion and LiFePO4 packs with built-in balancing and low internal resistance MOSFETs.
30 A NEEY 10S 30 A · 10S
10S protection board for Li-ion and LiFePO4 packs with built-in balancing and low internal resistance MOSFETs.
50 A NEEY 16S 50 A · 16S
16S protection board for Li-ion and LiFePO4 packs with built-in balancing and low internal resistance MOSFETs.
50 A NEEY 17S 50 A · 17S
17S protection board for Li-ion and LiFePO4 packs with built-in balancing and low internal resistance MOSFETs.
Spares
Everything needed to fit a balancer to a pack that does not match the default connector layout.
NEEY 4A Adapter · —
Break-out adapter board for the 4A balancer, for packs whose tap spacing does not match the default connector.
NEEY-Adapter15A · —
Break-out adapter board for the 15A balancer’s 7.62 mm screw terminals.
NEEY 4A Extra Cable · —
Extra-length cell sampling leads for the 4A balancer when the pack taps sit further from the board than the standard set reaches.