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ICA 681b UPS need fixing HELP

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eszaqsc

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Hello, i have an old UPS (ICA brand) type 681b, the MOSFET inside is burning (fire came out from it, while there is no AC supply power, so the cause of burn is from the 24v battery). it's uses 6x IRF540N, but my local store ran out of it, so i intend to use IRF3415 to replace 'em, my question is that can i do that (use IRF3415 instead of IRF540N)?.
History before: the UPS already been service about 2 years ago, and they said that the MOSFET is broken (IRF540N) so the changed it with the new one. and right now beacuse of some unstable current it blow off again.
so , any opinions?
The UPS uses :
2X 12v Sealed Lead-acid battery (in serial)


PS : Electrical knowlegde is so-so (not that good):cry:
 

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