Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Battery Capacity Range: NiMH/NiCd: 100-50000mAh, Case Size: 135x110x60mm, NiMH/NiCd: 1-15cells Pb: 2-20V DJI: 3cells(LiHV), External Port: 1-6S Balance Socket-XH, Charge Voltage: LiPo: 4.18-4.25V/cell Lilon: 4.08-4.2V/cell, Reading Voltage Range: 0.1-26.1V/cell, AC Input Voltage: 100-240V, Weight: 390g, DC Input, Charge Current: 0.1A-8.0A, Balance Current: 300mA/cell Max, Battery Types/Cells: LiPo/Lilon/LiFe/LiHV: 1-6cells, DC Input Voltage: 11-18V, Charge Wattage: 80W, Detection for NiMH/NiCd: 3-15mV/cell / Default: 4mV/cell, Safety Timer: 1-120minutes off, Controls: Four Buttons, LiFe: 3.58-3.7V/cell LiHV: 4.25-4.35V/cell, Display Type: 2X16 LCD, Discharge Current: 0.1A-2.0A, Temperature Probe Socket., Battery Socket, LiPo/Lilon/LiFe/UHV: 100-50000mAh Pb: 100-50000mAh, Battery Cutoff Temperture: 20℃/68℃-80℃/176℃(adjustable), Case Material: Plastic
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($68.00): BGGAL8
2. ($68.00): BGRCParts8
3. ($68.00): 8Couponsde
4. ($68.00): MVC8SPRING
apply it in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGss9%RC, Charger12, BGe680, BG6480, AFfbG10, BGBFAFF2019, BGCITYADS2019, BG10BC, BGAFF10OFF, bGhOnEy10, BGBC1, BGE68012, BgcLuBofErtA10, BGCuponation10, BGBCSpring1, BGDAVIS, BGHONEY2110, Parts8, BGRCBC11, BGSFBC1, Tabby20, BG1efeb0
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Do you need price history chart (for all/most countries) for SKYRC e680 80W 8A AC/DC Balance Charger? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).