Battery High Energy Lithium Battery, Color Black, Stroke 12mm, Chaging Time 90 Min, Weight 1.04kg/2.40kg(Includes Charger And Packaging), Rated Input 100-240V~50/60Hz / 25W, Battery Capacity 2000mAh, Model Booster Pro 2, Working Time 3.5-4 Hrs, Sound Pressure Level 70 dB(A), Power 135W Max., Rated Output 25V/1A, Sound Power 78 dB(A), Rated Voltage 24V DC, Unloaded Speed 1800-3400/Min Max., Size 200*60*285mm, Material ABS.
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Aliexpress
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Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
1. ($176.63): BGCAPITALOS8
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGHB218, BG22f7a1, tRaDetRaCKeR, BGHECARE1, BG4ee866, BGHOM095, Cuponation9, BG75597c, BGd831c9, BG589b2e, JanBGCoupon8, BGSaleFeb8, BGSaleAD, BGMARCHSALE, BGAUGUST8
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Booster Pro 2 Deep Tissue Muscle Massager. The lowest price was: $99.99.
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)).