A JST-XH balance extension lead adds 20 cm of 22AWG wire between a LiPo pack and the charger. The 5-piece pack covers 1S to 6S, from $7.37. Match the lead to the cell count, check every cell with a checker, and balance-charge every cycle. The 6-pack checker costs $29.99 and reads 1 to 8S packs.
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What does a balance extension lead do?
The lead extends the short balance wires on the battery to the charger.
Each lead is 20 cm long and uses 22AWG wire in a 5-piece pack.
The JST-XH connector plugs into the balance port on the charger.
How do you match the lead to the pack?
Read the cell count from the wire count on the balance connector.
A 5-pin lead fits a 4S pack, and a 7-pin lead fits a 6S pack.
The 1S lead costs $7.37 and the 6S lead costs $10.65.
How do you check cells before charging?
The 6-pack checker reads 1 to 8S packs in four chemistries.
It shows each cell voltage, the total voltage, and the capacity percent.
The low-voltage buzzer warns when a cell drops too low.
What does the 3-in-1 checker balancer do?
The 3-in-1 unit checks, balances, and discharges packs for storage.
Its LCD shows the cell voltages, and two buttons select the mode.
It costs $12.00 and takes JST, RxBatt, and balance-lead plugs.
What did we check on the bench?
We matched the 20 cm length and 22AWG wire to the leads listing.
We matched the 1 to 8S range and the buzzer to the checker listing.
We counted 1 image on each of the three main listings.
Quick comparison
| Item | Size | Price |
|---|---|---|
| Balance lead 1S | 20 cm | $7.37 |
| Balance lead 2S | 20 cm | $7.77 |
| Balance lead 3S | 20 cm | $8.09 |
| Balance lead 4S | 20 cm | $8.77 |
| Balance lead 5S | 20 cm | $9.97 |
| Balance lead 6S | 20 cm | $10.65 |
| Checker 6-pack | 1-8S | $29.99 |
| 3-in-1 checker balancer | 2-6S | $12.00 |
| Adapter board | 2S-6S | $7.99 |
Steps
- Match the lead to the cell count on the pack.
- Plug the lead into the balance port on the charger.
- Read every cell on the checker before you start.
- Balance-charge the pack and watch the cell voltages.
- Discharge packs to storage voltage after flying.
Frequently asked questions
Can I use a 6S lead on a 4S pack?
No. Match the lead to the pack cell count, so each cell wire lands on the right charger pin.
Do I need the adapter board?
The adapter board expands one charger balance port to several packs. It covers 2S to 6S packs and costs $7.99.
What does the low-voltage buzzer mean?
It means a cell has dropped to a low voltage. Stop flying or charging and check the pack on the checker.
Can the 3-in-1 unit discharge a pack for storage?
Yes. It has check, balance, and discharge modes, so it can bring a pack down to storage voltage after flying.
Parts used
JST-XH 1S-6S Balance Extension Leads, 20cm, 5 Pieces, $7.37
LiPo Battery Voltage Checker 1-8S with Low Voltage Buzzer Alarm, 6-Pack, $29.99
3-in-1 Battery Voltage Checker Balancer and Discharger, $12.00
2S-6S JST-XH Balance Charging Adapter Board, $7.99
Related buying guides on Quality RC Parts
JST-XH Balance Leads: How to Balance-Charge LiPo Safely
TP4056 Charging Module: LiPo and Li-ion Basics Guide
How to Wire a 5V Active Buzzer on an FPV Racing Drone
Browse all the guides on the Quality RC Parts Drone Guides hub, or start at the Quality RC Parts store.
Sources
Quality RC Parts stocks parts in New York, USA and ships in-stock orders in 1-2 business days.
Last updated: 2026-11-11.