Fold up shooting chrony. Can it handle 12.6v?

Not sure if anyone here will know the answer to this question. But I have an old chonry. It's the fold up shooting chory beta modem. Picture below. It uses 9v battery to power it. The battery runs out all the time and i always get the low battery warning. I'm tired of getting 9v battery for it since they cost like $8-9 for only 2 battery. I was thinking of cutting off the wire and attach an dean plug so I can use an lipo battery. The lipo battery will last way longer and I can always charge it. Then I won't have to buy those stupid 9v battery. But lipo comes in 2 cell (7.4v) and 3 cell (11.1v). The 2 cell is probably too low for it. The 3 cell when fully charge is about 12.6v. I am worried the 3 cell lipo will fried the chonry. So my question is, does anyone know if it's safe to use an 3 cell lipo battery for these type of chorny?

PY-A-837_Chrony_Beta_blue_837.jpg
 
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Rechargeable 9v batteries

$20 for two 9v battery. They are only 850mah. Not sure how long that last. My experience with aa and aaa rechargeable batteries is they are crap and always drain fast or dont even hold charge. My worried of those 9v rechargeable batteries is they wont hold charges just like aa and aaa rechargeable batteries. I have plenty of 3000mah -10,000mah 3s lipo battery cause I run rc trucks and rc helicopters. I know for a fact lipo battery will hold their charges and is way bettery than those type of rechargeable battery. But if these chorny can't handle 3s lipo I guess I can try out 9v rechargeable batteries. Beats buying 9v battery when it gets low warning.