Galaxy S7: Battery case to extend battery life?

JEDI

Lifer
Sep 25, 2001
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Got an old S7 from a relative.

Battery doesn't last 10hrs with medium battery saver on!
The s7 does wireless charging.

Saw battery cases on ebay.
It's a case to protect your phone but will also charge your battery.

$25 (+ $5 shipping) official Samsung:
https://www.ebay.com/itm/194452566102?hash=item2d4646b056:g:aWYAAOSw3Y5hcBb6&LH_ItemCondition=1000

$32 MOPHIE Juice Pack Wireless Charging 2950mAh Battery Case:
https://www.ebay.com/itm/154538289801?epid=1483313804&hash=item23fb332a89:g:kl4AAOSwt9NhJwk-&LH_ItemCondition=1000

What do you think?
Should I buy it? If so, which?

edit:
Do these cases actually protect the phone?
 
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