Is a £50 battery from amazon good or bad?

Chris bought a battery from amazon to try it out and see if it compares to some of the more expensive brands out there.
The mast wireless battery is made by Dragon hawk in China.
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I NEED YOUR HELP.
This video/giveaway is for Sam. A friend of ours who is terminally ill and in desperate need of some help. Sam was a very talented artist before Motor Neurone Disease (MND) took hold and is now unable to continue her passion.
The just giving page for the donations and giveaways is here:
www.justgiving.com/crowdfundi...
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Save YOUR ink:
consultations.hse.gov.uk/crd-...
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Visit our Sponsors:
www.electrumsupply.com
rawpigments.co
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Follow us on Instagram:
@paultlbt
@chrisharrisontattoo
@thattattooshow
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DISCOUNT CODES
Grab yourself a little discount on some codes We've organised for you.
Electrum:
www.electrumsupply.com
Use the code 'ThatTattooShow' for 10% off sitewide on your first order.
Cheyenne:
cheyennetattoo.com
Use the code 'ThatTatShow10' for 10% off your order.
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WATCH | LISTEN | READ
AUDIO PODCAST - open.spotify.com/show/0v0jzH3...
TTS BLOG - thattattooshow.co.uk/blog/