What is the max charge rate (in amps) that I can charge this using my balance charger?

Personally I wouldn't charge max rate will ruin battery faster and u will have shorter usage bcus of quick power loss. It should say n specs on package.

Will this battery work in a stock arrma new big rock 2020

No it will not, the big rock can only take up to a 3s lipo and this is a 4s. The big rock also has the ic5 connector as this battery comes with an ic3 so it won't plug in. This is also a 2200mah pack, I would look for at least a 5000mah to get a decent amount of run time.

Who sells a LiPo battery safe bag or case?

Hobby stores like Horizon Hobbies, Tower Hobby or Hobby Town

How long is the battery life? Also, how long does it take for the battery to charge.

Hello , Hard to tell you how long is the battery life , Depend to your utilisation , way storage , shock in the car , etc ... For the charge : approximatly 2h hours to full charge . Have a nice day

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⚡ Charge ahead with power and precision!

SMART SAFE - Integrated IC3 connector and smart battery tech for hassle-free charging and reliable performance.
RAPID RESPONSE - 30C discharge rate provides instant power bursts for peak acceleration and control.
POWER YOUR PASSION - 14.8V voltage delivers consistent, high-performance energy for demanding RC and hobby projects.
ENDURANCE THAT LASTS - 2200mAh capacity ensures extended run times, keeping you ahead in every race or flight.
COMPACT LIGHTWEIGHT - Sleek 250g design fits seamlessly into your setup without weighing you down.

The Spektrum 14.8V 2200mAh 4S 30C Smart LiPo Battery with IC3 connector is a high-voltage, high-capacity power source designed for hobbyists seeking reliable, long-lasting energy with smart charging capabilities. Compact and lightweight, it supports demanding RC applications with rapid discharge and safe operation.

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Product Dimensions	14.73 x 6.35 x 5.84 cm; 250 g
Batteries	1 Lithium Metal batteries required. (included)
Manufacturer recommended age	14 months - 10 years
Item model number	SPMX22004S30
Number of Puzzle Pieces	1
Assembly Required	Yes
Batteries Required?	Yes
Batteries Included?	Yes
Material Type(s)	Plastic
Remote Control Included?	No
Radio Control Suitability	Hobby
Color	multicoloured
Release date	29 September 2021
ASIN	B07HP594C1

Spektrum 14.8V 2200mAh 4S 30C Smart LiPo Battery: IC3

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